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

Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs
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摘要 A series of novel hyperbranched polymers(HBPs) consisting of a 2,7-subsituted 9-(heptadecan-9-yl)-9H-carbazole unit(A_2+A_2') and a tetra-substituted green thermally activated delayed fluorescence(TADF) dye of 2,3,5,6-tetra(9Hcarbazol-9-yl)-4-pyridinecarbonitrile(4CzCNPy, B4) have been synthesized via Suzuki cross-coupling reaction following an 'A2+A2'+B_4' 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(Td) above 400 ℃ and glass transition temperatures(Tg) 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. A series of novel hyperbranched polymers (HBPs) consisting ofa 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 "Az+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 (Ta) above 400 ℃ and glass transition temperatures (Tg) 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.
作者 Ling-yun Zhao Ya-nan Liu Shi-fan Wang You-tian Tao Fang-fang Wang Xin-wen Zhang Wei Huang Zhao, Ling-yun[1,2];Liu, Ya-nan[1,2];Wang, Shi-fan[1,2,3];Tao, You-tian[1,2];Wang, Fang-fang[1,2];Zhang, Xin-wen[4,5];Huang, Wei[1,2,4,5];
出处 《高分子科学:英文版》 SCIE CAS CSCD 2017年第4期490-502,共13页 Chinese Journal of Polymer Science
基金 This work was financially supported by the National Natural Science Foundation of China (No. 21304047), Natural Science Foundation of Jiangsu Province (No. BK2016042) and Research Fund for the Doctoral Program of Higher Education (No. 20133221120015).
Hyperbranched polymers Host Dopant Polymer lighting-emitting diodes Thermally activated delayedfluorescence
分类号 O [理学]
作者简介 E-mail: iamyttao@njtech.edu.cn E-mail: iamwhuang@nj tech.edu.cn
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