scholarly journals Conformation Control of Iminodibenzyl-Based Thermally Activated Delayed Fluorescence Material by Tilted Face-to-Face Alignment With Optimal Distance (tFFO) Design

2020 ◽  
Vol 8 ◽  
Author(s):  
Yu Kusakabe ◽  
Yoshimasa Wada ◽  
Hiromichi Nakagawa ◽  
Katsuyuki Shizu ◽  
Hironori Kaji
Keyword(s):  
Delayed Fluorescence ◽  
Face Alignment ◽  
Thermally Activated Delayed Fluorescence ◽  
Face To Face ◽  
Thermally Activated ◽  
Optimal Distance ◽  
Fluorescence Material

scholarly journals High efficiency and low roll-off green OLEDs with simple structure by utilizing thermally activated delayed fluorescence material as the universal host

Nanophotonics ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 1133-1140 ◽  
Author(s):  
Bo Zhao ◽  
Yanqin Miao ◽  
Zhongqiang Wang ◽  
Kexiang Wang ◽  
Hua Wang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Power Efficiency ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Phenyl Sulfone ◽  
Decay Measurement ◽  
Green Fluorescent ◽  
Fluorescence Material

AbstractWe achieved high-efficiency and low-roll-off green fluorescent and phosphorescent organic light-emitting diodes (OLEDs) simultaneously by adopting the thermally activated delayed fluorescence material of bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone as the universal host. At a luminance of 1000 cd/m2, fluorescent OLEDs based on C545T get a current efficiency, power efficiency, and external quantum efficiency (EQE) of 31.8 cd/A, 25.0 lm/W, and 9.26%, respectively. This is almost the highest efficiency based on C545T at the luminance of 1000 cd/m2 to date. On the other hand, phosphorescent OLEDs with Ir(ppy)3 as the emitter realize a maximum current efficiency, power efficiency, and EQE of 64.3 cd/A, 62.4 lm/W, and 18.5%, respectively. More important, the EQE remains 17.8% at the representative luminance of 1000 cd/m2 and the roll-off ratio is just 3.78%. The transient photoluminescence decay measurement demonstrates that the up-conversion of host triplet excitons plays a key role in the high efficiency and low roll-off. More detailed discussions are also given.

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