Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs

Ling-yun Zhao; Ya-nan Liu; Shi-fan Wang; You-tian Tao; Fang-fang Wang; Xin-wen Zhang; Wei Huang

doi:10.1007/s10118-017-1881-1

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Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs

Papers | Updated：2021-02-18

- Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs
- Chinese Journal of Polymer Science Vol. 35, Issue 4, Pages: 490-502(2017)
- Affiliations：
  
  a.Key Laboratory for Flexible Electronics & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
  b.School of Chemistry and Chemical Engineering, Xuzhou Institute of Technology, Xuzhou 221111, China
  c.Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
- Author bio：
  
  Xin-wen Zhang (张新稳), E-mail: iamxwzhang@njupt.edu.cn
  Wei Huang (黄维), E-mail: iamwhuang@njtech.edu.cn
- Funds：
- DOI：10.1007/s10118-017-1881-1
  CLC：
- Received：01 September 2016，
  
  Revised：2016-9-27，
  
  Accepted：28 September 2016，
  
  Published：2017-04
- Accepted：
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Ling-yun Zhao, Ya-nan Liu, Shi-fan Wang, et al. Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs[J]. Chinese Journal of Polymer Science, 2017, 35(4): 490-502.
DOI：

Ling-yun Zhao, Ya-nan Liu, Shi-fan Wang, et al. Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs[J]. Chinese Journal of Polymer Science, 2017, 35(4): 490-502. DOI： 10.1007/s10118-017-1881-1.

摘要

Abstract

A series of novel hyperbranched polymers (HBPs) consisting of a 2

7-subsituted 9-(heptadecan-9-yl)-9

-carbazole unit (A

') and a tetra-substituted green thermally activated delayed fluorescence (TADF) dye of 2

6-tetra (9

-carbazol-9-yl)-4-pyridinecarbonitrile (4CzCNPy

) have been synthesized

via

Suzuki cross-coupling reaction following an "A

'+B

" method. The polymers are named according to the polymerization ratio of 4CzCNPy monomer (5 mol%

10 mol% and 15 mol% for HBPs of P2-P4 respectively

and 0 mol% for the control linear polymer P1). Their thermal

optoelectronic and electrochemical properties have been characterized by a combination of techniques. All the polymers exhibit high thermal stability with the decomposition temperatures (

) above 400℃ and glass transition temperatures (

) up to 98℃. Unfortunately

the incorporation of TADF moiety into these HBP materials induced non-TADF characteristics. However

when the HBPs functionalized as the host for our previously developed 4CzCNPy TADF dopant in solution processed devices

maximum external quantum efficiency of 5.7% and current efficiency of 17.9 cd/A have been achieved in P3-based device

which is significantly higher than those of 1.5% and 4.2 cd/A for the linear polymer P1.

关键词

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references

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