scholarly journals Thermally Activated Delayed Fluorescence Material: An Emerging Class of Metal‐Free Luminophores for Biomedical Applications

2021 ◽  
pp. 2102970
Author(s):  
Fang Fang ◽  
Lin Zhu ◽  
Min Li ◽  
Yueyue Song ◽  
Meng Sun ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Metal Free ◽  
Thermally Activated ◽  
Fluorescence Material

Thermally activated delayed fluorescence with circularly polarized luminescence characteristics

2015 ◽  
Vol 51 (68) ◽  
pp. 13268-13271 ◽  
Author(s):  
Takuro Imagawa ◽  
Shuzo Hirata ◽  
Kenro Totani ◽  
Toshiyuki Watanabe ◽  
Martin Vacha
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Circularly Polarized ◽  
Metal Free ◽  
Thermally Activated ◽  
Sign Inversion ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Large Conformational Change ◽  
Luminescence Characteristics

A metal-free aromatic compound exhibiting thermally activated delayed fluorescence as well as circularly polarized luminescence (CPL) with dissymmetry factors of 10−3 is reported. This compound shows a sign inversion between its circular dichroism signal and CPL, which is caused by a large conformational change upon photoexcitation.

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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