期刊
ADVANCED PHOTONICS RESEARCH
卷 2, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/adpr.202100031
关键词
charge balance; deep-blue organic light-emitting diodes; energy transfer; low efficiency roll-off; ultrahigh brightness
资金
- National Natural Science Foundation of China [51973107, 51673113]
- key project of Department of Education of Guangdong Province [2018KZDXM032]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme [GDUPS2019]
- STU Scientific Research Foundation for Talents [NTF20033]
The study systematically investigates the FRET efficiencies for high-performance PHOLEDs based on a simple bipolar luminogen PHT-PPI with high triplet energy, achieving a maximum external quantum efficiency of 26.14% and ultrahigh brightness of 152000cdm(-2) for the orange PHOLED. The devices exhibit low efficiency roll-off, especially the orange PHOLED with a roll-off of <9% even at a brightness of 10000cdm(-2).
Of paramount significance in phosphorescent organic light-emitting diodes (PHOLEDs) are the facts that Forster resonance energy transfer (FRET) must be sufficient and back energy transfer should be prohibited. Herein, the FRET efficiencies for high-performance PHOLEDs based on a simple bipolar luminogen 1-phenyl-2-(5 '-phenyl-[1,1 ':3 ',1 ''-terphenyl]-4-yl)-1H-phenanthro[9,10-d]imidazole (PHT-PPI) with high triplet energy of 2.44eV are systematically investigated. As a result, with PO-01 as dopant, the high-performance orange PHOLED is achieved with maximum external quantum efficiency (EQE(max)) of 26.14% and ultrahigh brightness of 152000cdm(-2), which are the highest reported efficiencies for orange OLEDs with such high brightness. In addition, the green and red PHOLEDs are also fabricated with EQE(max) of 15.38% and 16.12%, respectively. Furthermore, the nondoped device based on PHT-PPI as a deep-blue emitter is also obtained with an EQE(max) of 5.12% and the Commission Internationale de L'Eclairage (CIE) index of (0.15, 0.08). More importantly, the blue, green, orange, and red devices exhibit low efficiency roll-off, particularly, of which the orange PHOLED is extremely small (<9%) even at the brightness of 10000cdm(-2).
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