Citation: Ning Sun, Han Gao, Lili Sun, Jingxi An, Man Xu, Chen Sun, Yamin Han, Jinyi Lin, Jiangli Cai, Mingjian Ni, Liangliang He, Jinghao Yang, Zhoulu Wang, Lubing Bai, Xinwen Zhang, Qi Wei, Xuehua Ding, Chengrong Yin, Linghai Xie, Wei Huang. Enhancement of morphological and emission stability of deep-blue small molecular emitter via a universal side-chain coupling strategy for optoelectronic device[J]. Chinese Chemical Letters, ;2022, 33(2): 835-841. doi: 10.1016/j.cclet.2021.07.069 shu

Enhancement of morphological and emission stability of deep-blue small molecular emitter via a universal side-chain coupling strategy for optoelectronic device

Ning Sun ^{a, 1} ,
Han Gao ^{a, 1} ,
Lili Sun ^{a, 1} ,
Jingxi An ^b ,
Man Xu ^b ,
Chen Sun ^a ,
Yamin Han ^a ,
Jinyi Lin ^{a, *} ,
Jiangli Cai ^a ,
Mingjian Ni ^a ,
Liangliang He ^a ,
Jinghao Yang ^a ,
Zhoulu Wang ^{a, *} ,
Lubing Bai ^a ,
Xinwen Zhang ^b ,
Qi Wei ^a ,
Xuehua Ding ^{a, *} ,
Chengrong Yin ^a ,
Linghai Xie ^b ,
Wei Huang ^{a, b, c, **}

a.
Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing 210000, China
b.
State Key Laboratory of Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
c.
Frontiers Science Center for Flexible Electronics (FSCFE), MIIT Key Laboratory of Flexible Electronics (KLoFE), Northwestern Polytechnical University, Xi'an 710072, China

^**

iamjylin@njtech.edu.cn

WangZhouLu66@163.com

iamxhding@njtech.edu.cn

wei-huang@njtech.edu.cn

Received Date: 7 May 2021
Revised Date: 27 July 2021
Accepted Date: 30 July 2021
Available Online: 5 August 2021

Figures(6)

Film morphology of emissive layers is crucial to the performance and stability of solution-processable organic light-emitting diodes (OLEDs). Compared to the interpenetration of conjugated polymer chain, small molecular emitter with a flexible side chain always presents easily aggregation upon external treatment, and caused π-electronic coupling, which is undesirable for the efficiency and stability of deep-blue OLEDs. Herein, we proposed a side-chain coupling strategy to enhance the film morphological an emission stability of solution-processable small molecular deep-blue emitter. In contrary to "parent" MC8TPA, the crosslinkable styryl and vinyl units were introduced as ended unit at the side-chain of CmTPA and OEYTPA. Interestingly, CmTPA and OEYTPA films present a relatively stable morphology and uniform deep-blue emission after thermal annealing (160 ℃) in the atmosphere, different to the discontinuous MC8TPA annealed film. Besides, compared to the CmTPA and OEYTPA ones, serious polaron formation in the MC8TPA annealed film also negative to the deep-blue emission, according to transient absorption analysis. Therefore, both CmTPA and OEYTPA annealed film obtained at 140 ℃ present an excellent deep-blue ASE behavior with a 445 nm, but absence for MC8TPA ones, associated with the disruption of annealed films. Finally, enhancement of device performance based on CmTPA and OEYTPA film (~40%) after thermal annealing with a similar performance curves also confirmed the assumption above. Therefore, these results also supported the effectiveness of our side-chain coupling strategy for optoelectronic applications.
- Side-chain coupling,
- Small molecular emitter,
- Morphological stability,
- Deep-blue emission,
- Optoelectronic device
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