Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength
A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus th...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Li, Huiting [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2020transfer abstract |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells - Haghgoo, M. ELSEVIER, 2020, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:183 ; year:2020 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.dyepig.2020.108732 |
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ELV051352184 |
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| 245 | 1 | 0 | |a Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength |
| 264 | 1 | |c 2020transfer abstract | |
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| 520 | |a A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. | ||
| 520 | |a A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. | ||
| 650 | 7 | |a Color tunable |2 Elsevier | |
| 650 | 7 | |a Thermally activated delayed fluorescence (TADF) |2 Elsevier | |
| 650 | 7 | |a Triazine-based emitter |2 Elsevier | |
| 650 | 7 | |a Intramolecular charge transfer |2 Elsevier | |
| 700 | 1 | |a Li, Jiuyan |4 oth | |
| 700 | 1 | |a Liu, Di |4 oth | |
| 700 | 1 | |a Mei, Yongqiang |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Haghgoo, M. ELSEVIER |t A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells |d 2020 |g Amsterdam [u.a.] |w (DE-627)ELV004269640 |
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10.1016/j.dyepig.2020.108732 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001132.pica (DE-627)ELV051352184 (ELSEVIER)S0143-7208(20)31429-7 DE-627 ger DE-627 rakwb eng 690 VZ 50.31 bkl 56.11 bkl Li, Huiting verfasserin aut Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. Color tunable Elsevier Thermally activated delayed fluorescence (TADF) Elsevier Triazine-based emitter Elsevier Intramolecular charge transfer Elsevier Li, Jiuyan oth Liu, Di oth Mei, Yongqiang oth Enthalten in Elsevier Science Haghgoo, M. ELSEVIER A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells 2020 Amsterdam [u.a.] (DE-627)ELV004269640 volume:183 year:2020 pages:0 https://doi.org/10.1016/j.dyepig.2020.108732 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.31 Technische Mechanik VZ 56.11 Baukonstruktion VZ AR 183 2020 0 |
| spelling |
10.1016/j.dyepig.2020.108732 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001132.pica (DE-627)ELV051352184 (ELSEVIER)S0143-7208(20)31429-7 DE-627 ger DE-627 rakwb eng 690 VZ 50.31 bkl 56.11 bkl Li, Huiting verfasserin aut Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. Color tunable Elsevier Thermally activated delayed fluorescence (TADF) Elsevier Triazine-based emitter Elsevier Intramolecular charge transfer Elsevier Li, Jiuyan oth Liu, Di oth Mei, Yongqiang oth Enthalten in Elsevier Science Haghgoo, M. ELSEVIER A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells 2020 Amsterdam [u.a.] (DE-627)ELV004269640 volume:183 year:2020 pages:0 https://doi.org/10.1016/j.dyepig.2020.108732 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.31 Technische Mechanik VZ 56.11 Baukonstruktion VZ AR 183 2020 0 |
| allfields_unstemmed |
10.1016/j.dyepig.2020.108732 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001132.pica (DE-627)ELV051352184 (ELSEVIER)S0143-7208(20)31429-7 DE-627 ger DE-627 rakwb eng 690 VZ 50.31 bkl 56.11 bkl Li, Huiting verfasserin aut Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. Color tunable Elsevier Thermally activated delayed fluorescence (TADF) Elsevier Triazine-based emitter Elsevier Intramolecular charge transfer Elsevier Li, Jiuyan oth Liu, Di oth Mei, Yongqiang oth Enthalten in Elsevier Science Haghgoo, M. ELSEVIER A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells 2020 Amsterdam [u.a.] (DE-627)ELV004269640 volume:183 year:2020 pages:0 https://doi.org/10.1016/j.dyepig.2020.108732 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.31 Technische Mechanik VZ 56.11 Baukonstruktion VZ AR 183 2020 0 |
| allfieldsGer |
10.1016/j.dyepig.2020.108732 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001132.pica (DE-627)ELV051352184 (ELSEVIER)S0143-7208(20)31429-7 DE-627 ger DE-627 rakwb eng 690 VZ 50.31 bkl 56.11 bkl Li, Huiting verfasserin aut Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. Color tunable Elsevier Thermally activated delayed fluorescence (TADF) Elsevier Triazine-based emitter Elsevier Intramolecular charge transfer Elsevier Li, Jiuyan oth Liu, Di oth Mei, Yongqiang oth Enthalten in Elsevier Science Haghgoo, M. ELSEVIER A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells 2020 Amsterdam [u.a.] (DE-627)ELV004269640 volume:183 year:2020 pages:0 https://doi.org/10.1016/j.dyepig.2020.108732 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.31 Technische Mechanik VZ 56.11 Baukonstruktion VZ AR 183 2020 0 |
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10.1016/j.dyepig.2020.108732 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001132.pica (DE-627)ELV051352184 (ELSEVIER)S0143-7208(20)31429-7 DE-627 ger DE-627 rakwb eng 690 VZ 50.31 bkl 56.11 bkl Li, Huiting verfasserin aut Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. Color tunable Elsevier Thermally activated delayed fluorescence (TADF) Elsevier Triazine-based emitter Elsevier Intramolecular charge transfer Elsevier Li, Jiuyan oth Liu, Di oth Mei, Yongqiang oth Enthalten in Elsevier Science Haghgoo, M. ELSEVIER A multiscale analysis for free vibration of fuzzy fiber-reinforced nanocomposite conical shells 2020 Amsterdam [u.a.] (DE-627)ELV004269640 volume:183 year:2020 pages:0 https://doi.org/10.1016/j.dyepig.2020.108732 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.31 Technische Mechanik VZ 56.11 Baukonstruktion VZ AR 183 2020 0 |
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Mechanism evolution from normal fluorescence to thermally activated delayed fluorescence and color tuning over visible light range: Effect of intramolecular charge transfer strength |
| abstract |
A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. |
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A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. |
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A group of D-π-A type emitters were designed and synthesized by using triazine (Trz) as electron acceptor (A), carbazole (Cz), 10-dimethylacridine (DMAC) or 10H-phenoxazine (PXZ) as electron donors (D), and phenylene as π-bridge between D and A. The electron withdrawing ability of A unit and thus the intramolecular charge transfer (ICT) strength play the most essential role to determine the luminescence mechanism and the emission color. By gradually enhancing the ICT extent through selecting strong electron donating D and/or replacing methyl with electron withdrawing cyano group on the π-bridge, the luminescence is tuned from normal fluorescence to thermally activated delayed fluorescence (TADF) and the emission color is successfully tuned from pure-blue (434 nm) to orange-red (616 nm). Organic light-emitting diodes (OLEDs) based on these emitters exhibit bright electroluminescence covering the major visible-light range. An external quantum efficiency (η ext) of 4.8% with excellent color coordinate of (0.16, 0.08) is obtained for pure blue fluorescent OLED of TrzCz-Me. TrzCz-CN, TrzDMAC-Me, and TrzPXZ-Me exhibited higher η ext values of 14.40% (19.73 cd A−1), 19.01% (41.12 cd A−1), 16.50% (51.17 cd A−1) in their blue, sky-blue, and green TADF OLEDs. This study provides a practical strategy related to ICT strength to facilitate generation of TADF emitters and tune the emission colors over the visible light range. |
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