Zig-Zag Type Molecular Design Strategy of N-Type Hosts for Sky-Blue Thermally-Activated Delayed Fluorescence Organic Light-Emitting Diodes |
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Authors: | Chang Yoon Yang Kyung Hyung Lee Prof. Jun Yeob Lee |
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Affiliation: | School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Seobu-ro, Suwon, Gyeonggi, 16419 Korea |
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Abstract: | N-type hosts for long lifetime in sky-blue thermally-activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were investigated by synthesizing four hosts with zig-zag-type backbone structure for high triplet energy. The four hosts had two CN units at different positions of the zig-zag-type backbone structure and two dibenzofuran units through either the 2 or 4-position of dibenzofuran. The position of the CN unit was controlled at the meta and para-positions in the zig-zag-type backbone to study the relationship between material parameters and lifetime of the TADF OLEDs. It was revealed that the meta-orientation of the CN units in the backbone was advantageous to extend device lifetime of the sky-blue TADF OLEDs. |
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Keywords: | device lifetime OLED sky-blue TADF |
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