Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 2, Pages 2197-2204Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b18665
Keywords
hybrid SEML WOLEDs; TADF; reduced triplet-triplet annihilation; bipolar host material; low efficiency roll-off
Funding
- National Natural Science Foundation of China [61575136, 21572152, 51773141, 51873139]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
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Hybrid single-emitting layer (SEML) white organic light emitting diodes (WOLEDs) incorporating blue thermally activated delayed fluorescent (TADF) or fluorescent materials and yellow phosphors have been widely utilized for solid-state lighting. Nonetheless, developing appropriate host materials to reduce the large efficiency roll-off at high luminance is still an unsolved issue. Here, two TADF materials denoted as TRZ-CF and TRZ-CzF were synthesized, with electroluminescent emission peaking at 476 and 460 nm, respectively. In particular, TRZ-CF, using 7,7-dimethyl-5,7-dihydroindeno[2,1-b]carbazole (CF) as donor moiety, maintained both highly efficient blue emission (EQE(max) = 20.0%) and excellent charge transport abilities. The WOLED utilizing TRZ-CF as host material, doped by 0.8 wt % iridium(III) bis(4-phenylthieno[3,2-c]pyridinato-N, C2') (P0-01), has EQE(max) of 20.3%, realizing the lowest roll-off to date of less than 2% at a luminance of 10 000 cd/m(2). The efficiency roll-off is alleviated through the reduction the exciton quenching and triplet triplet annihilation (TTA) within the light-emitting layer, benefited from the TADF effect and bipolar property. The hybrid SEML WOLED exhibits Commission Internationale de L'Eclairage (CIE) coordinates of (0.38, 0.45), providing a practical way to simplify the production complexity and to reduce efficiency roll-off for solid-state lighting.
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