Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100273
Keywords
fluorescence; nondoped devices; organic light-emitting diodes; TADF emitters; thermally activated delayed fluorescence; triptycene
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Funding
- National Natural Science Foundation of China [51703131, 91833304]
- Shenzhen Peacock Plan [KQTD20170330110107046]
- Shenzhen Technology and Innovation Commission [JCYJ20180507182244027]
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By constructing two TADF emitters based on TDMAC, the researchers achieved high-efficiency OLED device designs, with excellent external quantum efficiencies obtained for doped and nondoped devices.
Organic light-emitting diodes (OLEDs) with simple nondoped device structure are extremely attractive for real applications since excitons can be utilized without considering the possible charge trapping and morphology issues in the host-dopant systems. Emitters with suppressed concentration annihilation capability are essential for nondoped devices. Herein, two thermally activated delayed fluorescence (TADF) emitters based on a novel 3D electron donor, namely, TDMAC, are constructed. The TDMAC donor consists of a conventional donor with fused triptycene scaffold. Benefitting from the unique rigid and bulky triptycene moiety, these TADF emitters exhibit excellent thermal, morphological, and photophysical properties. Consequently, highly efficient OLEDs with external quantum efficiencies up to 24.2% and 23% are realized for doped and nondoped devices, respectively.
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