Modulating Backbone Conjugation of Polymeric Thermally Activated Delayed Fluorescence Emitters for High‐Efficiency Blue OLEDs

• DOI: 10.1002/adfm.202305324
• Publication Date: 2023-06-20T13:44:35Z
• Authors: Xingwen Tong; Zhennan Zhao; Lei Hua; Yuzhuo Zhang; Bowei Xu; Yuchao Liu; Shouke Yan; Zhongjie Ren
• Keywords: Luminous efficacy

Abstract Blue conjugated polymers‐based OLEDs with both high efficiency and low roll‐off are under big challenge. Herein, a strategy of local conjugation is proposed to construct high‐efficiency blue‐emitting polymers, in which the degree polymeric backbones adjusted by inserting different spacers. In this way, energy level triplet state transfer direction main‐chains can be effectively regulated. Benefiting from such fine regulation, prepared alternative copolymers Alt‐PB36 better suppress accumulation long‐lived excitons comparing complete polymers. The higher PLQY also verifies effective TADF units. Accordingly, based solution‐processed achieve an EQE max 11.6% very 2.8% at 100 cd m −2 15.2% 500 . This result represents best among blue light‐emitting polymer‐based so far luminance.