Approaching Nearly 40% External Quantum Efficiency in Organic Light Emitting Diodes Utilizing a Green Thermally Activated Delayed Fluorescence Emitter with an Extended Linear Donor–Acceptor–Donor Structure

2021 ◽  
pp. 2103293
Author(s):  
Yang Chen ◽  
Dongdong Zhang ◽  
Yuewei Zhang ◽  
Xuan Zeng ◽  
Tianyu Huang ◽  
...  
2018 ◽  
Vol 6 (20) ◽  
pp. 5363-5368 ◽  
Author(s):  
Ji Han Kim ◽  
Dong Ryun Lee ◽  
Si Hyun Han ◽  
Jun Yeob Lee

Highly efficient red thermally activated delayed fluorescence organic light-emitting diodes were developed using a reverse intersystem crossing activating host derived from phenylcarbazole and pyridofuropyridine.


RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4336-4343 ◽  
Author(s):  
Ikbal Marghad ◽  
Fatima Bencheikh ◽  
Chao Wang ◽  
Sophia Manolikakes ◽  
Alice Rérat ◽  
...  

A novel TADF emitter showing dual emission is synthesized and applied to OLEDs with an external quantum efficiency of 11.5%.


2016 ◽  
Vol 4 (43) ◽  
pp. 10205-10208 ◽  
Author(s):  
Xin He ◽  
Tong Shan ◽  
Xiangyang Tang ◽  
Yu Gao ◽  
Jinyu Li ◽  
...  

DPAC–DBTDO possesses a very small ΔEST of 0.10 eV between S1 and T1. A high external quantum efficiency of 13.1% is achieved in multi-layered OLEDs.


Author(s):  
Abhishek Kumar Gupta ◽  
Tomas Matulaitis ◽  
David B. Cordes ◽  
Alexandra ------ Slawin ◽  
Ifor D. W. Samuel ◽  
...  

We have designed a highly twisted small TADF emitter PXZ-α-DK based on an -diketone (α-DK) as a strong acceptor and phenoxazine (PXZ) as a strong donor to obtain red-shifted emission in comparison to the equivalent -diketone linked to 9,9-dimethyl-9,10-dihydroacridine (DMAC). The PXZ-α-DK shows emission at 586 nm and DMAC-α-DK shows emission at 548 nm in 1,3-bis(N-carbazolyl)benzene (mCP) host at 1.5 wt% doping of the emitter, with short-delayed lifetimes of 6.9 μs for PXZ-α-DK and 7.6 μs for DMAC-α-DK. OLEDs fabricated using these emitters show green electroluminescence at 555 nm for DMAC-α-DK, with a maximum external quantum efficiency, EQEmax, of 6.3%, and orange electroluminescence at 585 nm for PXZ-α-DK, with an EQEmax of 0.8%. We corroborate the optoelectronic properties of these emitters with DFT calculations.


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