Non-conjugated Polynorbornene Hosts with High Triplet Energy Levels for Solution-processed Narrowband Blue OLEDs  

作　　者：LI Qiang CHEN Liang WANG Xingdong WANG Shumeng SHAO Shiyang WANG Lixiang 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,P.R.China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,P.R.China [3]State Key Laboratory of Marine Resource Utilization in South China Sea,School of Materials Science and Engineering,Hainan University,Haikou 570228,P.R.China

出　　处：《Chemical Research in Chinese Universities》2023年第5期763-771,共9页高等学校化学研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.52073282,52122309,21975247,51833009,52261135541);the CAS-Croucher Funding Scheme for Joint Laboratories,the Open Project of the State Key Laboratory of Supramolecular Structure and Materials,China(No.sklssm2023019);the Start-up Scientific Research Foundation from Hainan University,China[No.KYQD(ZR)22174]。

摘　　要：Three polymer hosts(namely PNB-tBuCz,PNB-Ac,PNB-TAc)containing non-conjugated polynorbornene(PNB)backbone and hole-transporting arylamine segments(carbazole,acridan and dendritic teracridan)in side chains are developed for solution-processed narrowband blue organic light-emitting diodes(OLEDs).It is found that the non-conjugated polynorbornenes can keep high triplet energy(ET)levels in range of 3.12-3.20 eV by interrupting the conjugation of repeating units,making them capable as host materials for blue emitters.Meanwhile,by increasing the electron-donating capability of side chain arylamine from carbazole to acridan and dendritic teracridan,the highest occupied molecular orbital(HOMO)levels for the polymer hosts are elevated from-5.50 eV to-5.11 eV,beneficial for reducing the hole injection barrier from anode to emissive layer.As a result,solution-processed OLEDs employing polynorbornenes with dendritic teracridan side chain(PNB-TAc)as host and boron,selenium,nitrogen-containing multiple resonance thermally activated delayed fluorescence emitter as dopant reveal efficient narrowband blue electroluminescence with emission peak at 474 nm,full-width at half maximum of 30 nm,together with maximum external quantum efficiency of 20.2%,representing the state-of-the-art device efficiency for solution-processed OLEDs with narrowband blue emission.

关 键 词：Polymer host POLYNORBORNENE Organic light-emitting diode Solution-processed NARROWBAND Blue emission 

分 类 号：TN312.8[电子电信—物理电子学]