Affiliation:
1. State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China
2. Key Laboratory of Rubber‐Plastics, Ministry of Education Qingdao University of Science & Technology Qingdao 266042 China
Abstract
AbstractBlue conjugated polymers‐based OLEDs with both high efficiency and low efficiency roll‐off are under big challenge. Herein, a strategy of local conjugation is proposed to construct high‐efficiency blue‐emitting conjugated polymers, in which the conjugation degree of polymeric backbones is adjusted by inserting different spacers. In this way, the energy level of triplet state and the energy transfer direction of the polymeric main‐chains can be effectively regulated. Benefiting from such fine regulation, the prepared alternative copolymers Alt‐PB36 with local conjugated main‐chains can better suppress the accumulation of long‐lived triplet excitons comparing with the complete conjugated polymers. The higher PLQY of Alt‐PB36 also verifies the effective energy transfer from the polymeric main‐chains to the TADF units. Accordingly, Alt‐PB36 based solution‐processed OLEDs achieve an EQEmax of 11.6% and a very low efficiency roll‐off of 2.8% at 100 cd m−2 and 15.2% at 500 cd m−2. This result represents the best efficiency among blue light‐emitting conjugated polymer‐based OLEDs so far under high luminance.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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