Journal
CHINESE CHEMICAL LETTERS
Volume 30, Issue 11, Pages 1989-1993Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2019.09.013
Keywords
OLED; Deep blue; Phenanthroimidazole; Low efficiency roll-off; Fragment contribution analysis
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Funding
- National Natural Science Foundation of China [51673113]
- Key Project of DEGP [2018KZDXM032]
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Phosphorescent and thermally activated delayed fluorescence (TADF) emitters can break through the spin statistics rules and achieve great success in external quantum efficiency (over 5%). However, maintaining high efficiency at high brightness is a tremendous challenge for applications of organic light emitting diodes. Hence, we reported two phenanthroimidazole derivatives PPI-An-CN and PPI-An-TP and achieved extremely low efficiency roll-off with about 99% of the maximum external quantum efficiency (EQE(max)) maintained even at a high luminance of 1000 cd/cm(2) based non-doped devices. When doping the two materials in CBP (4,4'-bis(N-carbazolyl)-1,1'-biphenyl), the doped devices still exhibited excellent stability at high brightness with CIEy approximate to 0.07 and low turn-on voltage of only 2.8 V. The state-ofthe-art low efficiency roll-off makes the new materials attractive for potential applications. It is the first time that the Fragment Contribution Analysis method has been used to analyze the excited state properties of the molecules in the field of OLEDs, which helps us understand the mechanism more intuitively and deeply. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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