Thermally activated delayed fluorescence emitters with low concentration sensitivity for highly efficient organic light emitting devices

2019 ◽  
Vol 7 (29) ◽  
pp. 8923-8928 ◽  
Author(s):  
Xiao-Chun Fan ◽  
Kai Wang ◽  
Cai-Jun Zheng ◽  
Gao-Le Dai ◽  
Yi-Zhong Shi ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Low Concentration ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
Organic Light ◽  
Concentration Sensitivity ◽  
Molecular Rigidity

By introducing a fluorene group, the molecular rigidity and intermolecular steric hindrance of SPFS-PXZ are greatly improved. As a result, SPFS-PXZ successfully realizes high external quantum efficiencies with low concentration sensitivity in OLEDs.

scholarly journals Molecular design of efficient yellow- to red-emissive alkynylgold(iii) complexes for the realization of thermally activated delayed fluorescence (TADF) and their applications in solution-processed organic light-emitting devices

2021 ◽  
Author(s):  
Cathay Chai Au-Yeung ◽  
Lok-Kwan Li ◽  
Man-Chung Tang ◽  
Shiu-Lun Lai ◽  
Wai-Lung Cheung ◽  
...  
Keyword(s):  
Molecular Design ◽  
Delayed Fluorescence ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
New Class ◽  
Organic Light ◽  
Tunable Emission

We report the design of a new class of fused heterocyclic alkynyl ligand-containing gold(iii) complexes, which shows tunable emission colors spanning yellow to red region and exhibits thermally activated delayed fluorescence (TADF) properties.

scholarly journals Realization of Efficient Phosphorescent Organic Light-Emitting Devices Using Exciplex-Type Co-Host

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 51
Author(s):  
Lishuang Wu ◽  
Huiwen Xu ◽  
Huishan Yang
Keyword(s):  
High Performance ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
Organic Light ◽  
Sufficient Energy ◽  
Single Host ◽  
Organic Light Emitting Devices

High-performance phosphorescent organic light-emitting devices with an exciplex-type co-host were fabricated. The co-host is constituted by 1,3,5-tris(N-phenylbenzimidazol-2-yl) benzene, and 4,4,4-tris (N-carbazolyl) triphenylamine, and has obvious virtues in constructing efficient devices because of the thermally activated delayed fluorescence (TADF) resulting from a reverse intersystem crossing (RISC) process. The highest external quantum efficiency and luminance are 14.60% and 100,900 cd/m2 for the optimal co-host device. For comparison, 9.22% and 25,450 cd/m2 are obtained for a device employing 4,4,4-tris (N-carbazolyl) triphenylamine as a single-host. Moreover, the efficiency roll-off is notably alleviated for the co-host device, indicated by much higher critical current density of 327.8 mA/cm2, compared to 120.8 mA/cm2 for the single-host device. The alleviation of excitons quenching resulting from the captured holes and electrons, together with highly sufficient energy transfer between the co-host and phosphorescent dopant account for the obvious boost in device performances.

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