Citation: Ling-yun Zhao, Ya-nan Liu, Shi-fan Wang, You-tian Tao, Fang-fang Wang, Xin-wen Zhang, Wei Huang. 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 shu

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

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

Corresponding author: Xin-wen Zhang, iamxwzhang@njupt.edu.cn Wei Huang, iamwhuang@njtech.edu.cn
Received Date: 1 September 2016
Revised Date: 27 September 2016
Accepted Date: 28 September 2016

Fund Project: Natural Science Foundation of Jiangsu Province BK2016042the National Natural Science Foundation of China 21304047Research Fund for the Doctoral Program of Higher Education 20133221120015

A series of novel hyperbranched polymers (HBPs) consisting of a 2, 7-subsituted 9-(heptadecan-9-yl)-9H-carbazole unit (A₂+A₂') and a tetra-substituted green thermally activated delayed fluorescence (TADF) dye of 2, 3, 5, 6-tetra (9H-carbazol-9-yl)-4-pyridinecarbonitrile (4CzCNPy, B₄) have been synthesized via Suzuki cross-coupling reaction following an "A₂+A₂'+B₄" 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 (T_d) above 400℃ and glass transition temperatures (T_g) 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.
- Hyperbranched polymers,
- Host,
- Dopant,
- Polymer lighting-emitting diodes,
- Thermally activated delayed fluorescence
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