Citation: Yuan Wenbo, Yang Hannan, Zhang Mucan, Hu Die, Wan Shigang, Li Zijing, Shi Changsheng, Sun Ning, Tao Youtian, Huang Wei. Molecular engineering on all ortho-linked carbazole/oxadiazole hybrids toward highly-efficient thermally activated delayed fluorescence materials in OLEDs[J]. Chinese Chemical Letters, ;2019, 30(11): 1955-1958. doi: 10.1016/j.cclet.2019.08.019 shu

Molecular engineering on all ortho-linked carbazole/oxadiazole hybrids toward highly-efficient thermally activated delayed fluorescence materials in OLEDs

Yuan Wenbo ^a,1 ,
Yang Hannan ^b,1 ,
Zhang Mucan ^a,1 ,
Hu Die ^a ,
Wan Shigang ^a ,
Li Zijing ^a ,
Shi Changsheng ^b,*, ,
Sun Ning ^b ,
Tao Youtian ^a,*, ,
Huang Wei ^a,c

a.
Key Lab for Flexible Electronics & Institute of Advanced Materials(IAM), Nanjing Tech University, Nanjing 211816, China
b.
Department of Physics, Center for Optoelectronics Engineering Research, Yunnan University, Kunming 650091, China
c.
Shaanxi Institute of Flexible Electronics(SIFE), North western Polytechnical University(NPU), Xi'an 710072, China

csshi@ynu.edu.cn

iamyttao@njtech.edu.cn

Received Date: 27 June 2019
Revised Date: 18 July 2019
Accepted Date: 14 August 2019
Available Online: 14 November 2019

Figures(3)

The highest efficiency thermally activated delayed fluorescence (TADF) emitters in OLEDs are mostly based on twisted donor/acceptor (D/A) type organic molecules. Herein, we report the rational molecular design on twisted all ortho-linked carbazole/oxadiazole (Cz/OXD) hybrids with tunable D-A interactions by adjusting the numbers of donor/acceptor units and electron-donating abilities. Singlet-triplet energy bandgaps (ΔE_ST) are facilely tuned from~0.4, 0.15 to~0 eV in D-A, D-A-D to A-D-A type compounds. This variation correlates well with triplet-excited-state frontier orbital spatial separation efficiency. NonTADF feature with solid state photoluminescence quantum yield (PLQY) < 10% is observed in D-A type 2CzOXD and D-A-D type 4CzOXD. Owing to the extremely low ΔE_ST for efficient reverse intersystem crossing, strong TADF with PLQY of 71%-92% is achieved in A-D-A type 4CzDOXD and 4tCzDOXD. High external quantum efficiency from 19.4% to 22.6% is achieved in A-D-A typed 4CzDOXD and 4tCzDOXD.
- Oxadiazole,
- Carbazole,
- Donor-acceptor,
- Organic light-emitting diodes,
- Thermally activated delayed fluorescence
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