期刊
MATERIALS HORIZONS
卷 9, 期 4, 页码 1299-1308出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1mh02060a
关键词
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资金
- National Natural Science Foundation of China [52173186, 51703223, 91833306]
- National Key Research and Development Program [2017YFB0404402]
- Youth Innovation Promotion Association CAS [2021222]
This study develops two types of solution-processed white organic light-emitting diodes (WOLEDs) with high power efficiency by using a high triplet energy level (T-1) interfacial exciplex and a high reverse intersystem crossing (RISC) rate TADF emitter for triplet exciton management. The resulting WOLEDs exhibit record efficiencies for solution-processed WOLEDs, comparable to vacuum-deposited counterparts.
Solution-processed white organic light-emitting diodes (WOLEDs) have shown much lower device efficiency than their vacuum-deposited counterparts, due to the lack of triplet exciton management in a single-emissive-layer device structure, which will induce triplet-triplet annihilation (TTA) and triplet-polaron annihilation (TPA). Here, two kinds of solution-processed WOLEDs, including thermally activated delayed fluorescence (TADF)/phosphorescence hybrid WOLEDs and all-TADF WOLEDs, with high power efficiency are developed by using a high triplet energy level (T-1) interfacial exciplex as a host and a high reverse intersystem crossing (RISC) rate TADF emitter as a blue dopant for triplet exciton management. The interfacial exciplex host with high T-1 can ensure that triplet excitons transfer from the host to the blue emitter, and the blue TADF emitter with high RISC rate (1.15 x 10(7) s(-1)) can rapidly upconvert triplet excitons to singlet ones to avoid TTA and TPA. The solution-processed TADF/phosphorescence hybrid and all-TADF WOLEDs exhibit maximum external quantum efficiencies of 31.1% and 27.3%, together with maximum power efficiencies of 93.5 and 70.4 lm W-1, respectively, which are the record efficiencies for solution-processed WOLEDs, and quite comparable to those of most vacuum-deposited counterparts.
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