Red/Near‐Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency

2019 ◽  
Vol 131 (41) ◽  
pp. 14802-14807 ◽  
Author(s):  
Jia‐Xiong Chen ◽  
Wen‐Wen Tao ◽  
Wen‐Cheng Chen ◽  
Ya‐Fang Xiao ◽  
Kai Wang ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Near Infrared ◽  
Internal Quantum Efficiency ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

Red/Near‐Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency

2019 ◽  
Vol 58 (41) ◽  
pp. 14660-14665 ◽  
Author(s):  
Jia‐Xiong Chen ◽  
Wen‐Wen Tao ◽  
Wen‐Cheng Chen ◽  
Ya‐Fang Xiao ◽  
Kai Wang ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Near Infrared ◽  
Internal Quantum Efficiency ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

scholarly journals Ladder-like energy-relaying exciplex enables 100% internal quantum efficiency of white TADF-based diodes in a single emissive layer

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chunmiao Han ◽  
Ruiming Du ◽  
Hui Xu ◽  
Sanyang Han ◽  
Peng Ma ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Emissive Layer ◽  
Thermally Activated ◽  
Organic Light

AbstractDevelopment of white organic light-emitting diodes based on purely thermally activated delayed fluorescence with a single-emissive-layer configuration has been a formidable challenge. Here, we report the rational design of a donor-acceptor energy-relaying exciplex and its utility in fabricating single-emissive-layer, thermally activated delayed fluorescence-based white organic light-emitting diodes that exhibit 100% internal quantum efficiency, 108.2 lm W−1 power efficiency, and 32.7% external quantum efficiency. This strategy enables thin-film fabrication of an 8 cm × 8 cm thermally activated delayed fluorescence white organic light-emitting diodes (10 inch2) prototype with 82.7 lm W−1 power efficiency and 25.0% external quantum efficiency. Introduction of a phosphine oxide-based acceptor with a steric group to the exciplex limits donor-acceptor triplet coupling, providing dual levels of high-lying and low-lying triplet energy. Transient spectroscopic characterizations confirm that a ladder-like energy relaying occurs from the high-lying triplet level of the exciplex to a blue emitter, then to the low-lying triplet level of the phosphine oxide acceptor, and ultimately to the yellow emitter. Our results demonstrate the broad applicability of energy relaying in multicomponent systems for exciton harvesting, providing opportunities for the development of third-generation white organic light-emitting diode light sources.

Constitutional Isomers of Carbazole-Benzoyl-Pyrimidine-Based Thermally Activated Delayed Fluorescence Emitters for Efficient OLEDs

2021 ◽  
Author(s):  
Jayabalan Pandidurai ◽  
Jayachandran Jayakumar ◽  
Yi-Kuan Chen ◽  
Chia-Min Hsieh ◽  
Chien-Hong Cheng
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Internal Quantum Efficiency ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

Thermally activated delayed fluorescence (TADF) emitters are highly useful to achieve 100% internal quantum efficiency (IQE) and high external quantum efficiency (EQE) by reverse intersystem crossing. Herein, four sky-blue to...

Highly Efficient Near‐Infrared Electrofluorescence from a Thermally‐Activated Delayed Fluorescence Molecule

2021 ◽  
Author(s):  
Umamahesh Balijapalli ◽  
Ryo Nagata ◽  
Nishiki Yamada ◽  
Hajime Nakanotani ◽  
Masaki Tanaka ◽  
...  
Keyword(s):  
Near Infrared ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient

Deep-Red to Near-Infrared Thermally Activated Delayed Fluorescence in Organic Solid Films and Electroluminescent Devices

2017 ◽  
Vol 129 (38) ◽  
pp. 11683-11687 ◽  
Author(s):  
Chenglong Li ◽  
Ruihong Duan ◽  
Baoyan Liang ◽  
Guangchao Han ◽  
Shipan Wang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Electroluminescent Devices ◽  
Thermally Activated ◽  
Solid Films ◽  
Organic Solid
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