https://scholars.lib.ntu.edu.tw/handle/123456789/607050
標題: | An unsymmetrical thermally activated delayed fluorescence emitter enables orange-red electroluminescence with 31.7% external quantum efficiency | 作者: | Zeng X Huang Y.-H Gong S Li P Lee W.-K Xiao X Zhang Y Zhong C CHUNG-CHIH WU Yang C. |
關鍵字: | Charge transfer;Citrus fruits;Efficiency;Electroluminescence;Fluorescence;Steel beams and girders;Charge-transfer excited state;Device performance;External quantum efficiency;Horizontal dipoles;Molecular design;Molecular shapes;Photoluminescence quantum yields;Thermally activated delayed fluorescences;Quantum efficiency | 公開日期: | 2021 | 卷: | 8 | 期: | 8 | 起(迄)頁: | 2286-2292 | 來源出版物: | Materials Horizons | 摘要: | The thermally activated delayed fluorescence (TADF) emitters based on donor-acceptor (D-A) configuration were continuously developed in the past few years, whereas an unsymmetrical TADF emitter with A-D-A′ configuration has never been reported. Herein, an A-D-A′ type TADF emitter of TRZ-SBA-NAI was firstly developed by simultaneously integrating 2-phenyl-1H-benzo[de]isoquinoline-1,3(2H)-dione and 2,4,6-triphenyl-1,3,5-triazine acceptors into a spirobiacridine donor core. Due to the coexistence of double charge-transfer excited states, TRZ-SBA-NAI displayed dual emission containing a dominant orange-red emission and an anti-Kasha's rule sky-blue emission shoulder in solution. As doped into the host matrix, TRZ-SBA-NAI only exhibited an orange-red emission, together with a high photoluminescence quantum yield of 87%. The linear molecular shape imparted TRZ-SBA-NAI with a high horizontal dipole ratio of 88%. As a result, the TRZ-SBA-NAI based devices achieved a record-high external quantum efficiency of 31.7% with an electroluminescence peak at 593 nm. This finding not only enriches the diversity in TADF molecular design, but also unlocks the huge potential of A-D-A′ type TADF emitters for excellent device performance. ? The Royal Society of Chemistry. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112670757&doi=10.1039%2fd1mh00613d&partnerID=40&md5=15e0b64e8144aa2792271861f456171b https://scholars.lib.ntu.edu.tw/handle/123456789/607050 |
ISSN: | 20516347 | DOI: | 10.1039/d1mh00613d |
顯示於: | 電機工程學系 |
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