Citation: Sun Lili, Sun Ning, Bai Lubing, An Xiang, Liu Bin, Sun Chen, Fan Lixiang, Wei Chuanxin, Han Yamin, Yu Mengna, Lin Jinyi, Lu Dan, Wang Ning, Xie Linghai, Shen Kang, Zhang Xinwen, Xu Yanan, Cabanillas-Gonzalez Juan, Huang Wei. Alkyl-chain branched effect on the aggregation and photophysical behavior of polydiarylfluorenes toward stable deep-blue electroluminescence and efficient amplified spontaneous emission[J]. Chinese Chemical Letters, ;2019, 30(11): 1959-1964. doi: 10.1016/j.cclet.2019.08.048 shu

Alkyl-chain branched effect on the aggregation and photophysical behavior of polydiarylfluorenes toward stable deep-blue electroluminescence and efficient amplified spontaneous emission

Sun Lili ^a,1 ,
Sun Ning ^a,1 ,
Bai Lubing ^a,b,c ,
An Xiang ^a ,
Liu Bin ^d ,
Sun Chen ^e ,
Fan Lixiang ^b ,
Wei Chuanxin ^a ,
Han Yamin ^a ,
Yu Mengna ^b ,
Lin Jinyi ^a,c,*, ,
Lu Dan ^d ,
Wang Ning ^a ,
Xie Linghai ^b ,
Shen Kang ^a,*, ,
Zhang Xinwen ^b ,
Xu Yanan ^b ,
Cabanillas-Gonzalez Juan ^e ,
Huang Wei ^a,b,c,*,

a.
Key Laboratory of Flexible Electronics(KLOFE) & Institute of Advanced Materials(IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing Tech University(NanjingTech), Nanjing 211816, China
b.
Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials(IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China
c.
Shaanxi Institute of Flexible Electronics(SIFE), Northwestern Polytechnical University(NPU), Xi'an 710072, China
d.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China
e.
Madrid Institute for Advanced Studies(IMDEA Nanociencia), Ciudad Universitaria de Cantoblanco, Calle Faraday 9, Madrid 28049, Spain

iamjylin@njtech.edu.cn

iamkangshen@njtech.edu.cn

wei-huang@njtech.edu.cn

Received Date: 30 June 2019
Revised Date: 27 July 2019
Accepted Date: 27 August 2019
Available Online: 28 November 2019

Figures(6)

The control of the condensed superstructure of light-emitting conjugated polymers (LCPs) is a crucial factor to obtain high performance and stable organic optoelectronic devices. Side-chain engineering strategy is an effective platform to tune inter chain aggregation and photophysical behaviour of LCPs. Herein, we systematically investigated the alkyl-chain branched effecton the conformational transition and photophysical behaviour of polydiarylfluorenes toward efficient blue optoelectronic devices. The branched side chain will improve materials solubility to inhibit interchain aggregation in solution according to DLS and optical analysis, which is useful to obtain high quality film. Therefore, our branched PEODPF, POYDPF pristine film present high luminance efficiency of 36.1% and 39.6%, enhanced about 20% relative to that of PODPF. Compared to the liner-type sides' chain, these branched chains also suppress chain planarization and improve film morphological stability effectively. Interestingly, the branched polymer also had excellent stable amplified spontaneous emission (ASE) behaviour with low threshold (4.72 μJ/cm²) and a center peak of 465 nm, even thermal annealing at 220 ℃ in the air atmosphere. Therefore, side-chain branched strategy for LCPs is an effective means to control interchain aggregation, film morphology and photophysical property of LCPs.
- Light-emitting conjugated polymers,
- Branched effect,
- Aggregation behavior,
- Robust deep-blue emission,
- Efficient optoelectronic devices
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