Citation: Ning Sun, Qin Zou, Wenyu Chen, Yingying Zheng, Kai Sun, Chunbin Li, Yamin Han, Lubing Bai, Chuanxin Wei, Jinyi Lin, Chengrong Yin, Jianguo Wang, Wei Huang. Fluorene pendant-functionalization of poly(N-vinylcarbazole) as deep-blue fluorescent and host materials for polymer light-emitting diodes[J]. Chinese Chemical Letters, ;2023, 34(8): 108078. doi: 10.1016/j.cclet.2022.108078 shu

Fluorene pendant-functionalization of poly(N-vinylcarbazole) as deep-blue fluorescent and host materials for polymer light-emitting diodes

Ning Sun ^{a, b, 1} ,
Qin Zou ^{a, 1} ,
Wenyu Chen ^{a, 1} ,
Yingying Zheng ^a ,
Kai Sun ^a ,
Chunbin Li ^b ,
Yamin Han ^a ,
Lubing Bai ^a ,
Chuanxin Wei ^c ,
Jinyi Lin ^{a, *,} ,
Chengrong Yin ^{a, *,} ,
Jianguo Wang ^b ,
Wei Huang ^{a, c, d, *,}

a.
Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing 211816, China
b.
College of Chemistry and Chemical Engineering, Inner Mongolia Key Laboratory of Fine Organic Synthesis, Inner Mongolia University, Hohhot 010021, China
c.
Centre for Molecular Systems and Organic Devices (CMSOD), Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
d.
Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an 710072, China

iamjylin@njtech.edu.cn

iamcryin@njtech.edu.cn

wei-huang@njtech.edu.cn

Received Date: 16 October 2022
Revised Date: 19 November 2022
Accepted Date: 14 December 2022
Available Online: 17 December 2022

Figures(6)

π-Electron coupling of pendant conjugated segment in π-stacked semiconducting polymers always causes the formation of defect trapped sites and further quenched high-band excitons, which is harmful to the performance and stability of deep-blue polymer light-emitting diodes (PLEDs). Herein, considerate of “defect” carbazole (Cz) electromers in poly(N-vinylcarbazole) (PVK), a series of fluorene units are introduced into pendant segments (PVCz-DMeF, PVCz-FMeNPh and PVCz-DFMeNPh) to suppress the strong π-electron coupling of pendant Cz units and enhance radiative transition toward fabricating sable PLEDs. Compared to PVCz-FMeNPh and PVCz-DFMeNPh, PVCz-DMeF spin-coated films show a relatively efficient deep-blue emission, completely similar to its single pendant chromophore, confirmed an extremely weak charge-transfer and electron coupling between adjacent pendant segments. Therefore, PLEDs based on PVCz-DMeF present stable and deep-blue emission with a high color purity (0.17, 0.08), associated with extremely weak defect emission at 600~700 nm (induced by carbazole electromers). Finally, PLEDs based on PVCz-DMeF/F8BT blended films (1:1) also present the high maximum luminance (L_max) of 6261 cd/m² and current efficiency (CE_max) of 2.03 cd/A, confirmed slightly trapped sites formation. Therefore, precisely control the arrangement and packing model of pendant units in π-stacked polymer is an essential prerequisite for building efficient and stable emitter for optoelectronic devices.
- Poly(N-vinylcarbazole),
- Fluorene,
- Deep-blue emission,
- Energy transfer,
- Polymer light-emitting diodes
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