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P‐181: Efficient Thermally Activated Delayed Fluorescence Sensitizer of Hyperfluorescence OLED by Adding Blocking Group
Author(s) -
Yoon Sung Joon,
Chung Won Jae,
Lee Jun Yeob
Publication year - 2020
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.14324
Subject(s) - fluorescence , oled , acceptor , nitrile , blocking (statistics) , quantum efficiency , materials science , photochemistry , chemistry , optoelectronics , nanotechnology , organic chemistry , optics , physics , statistics , mathematics , layer (electronics) , condensed matter physics
In this work, two thermally activated delayed fluorescence (TADF) materials, TrzCN and t‐TrzCN were synthesized to study effect of blocking group at acceptor unit in yellow hyperfluorescence system Two TADF materials were designed to prevent Dexter energy transfer by integrating t‐butyl substituted triazine, nitrile electron withdrawing unit and diindolocarbazole electron donating unit. By comparing these two materials, we could confirm the effect of blocking group. In 20% TADF and 0.5% TBRb doped devices, TrzCN TADF sensitizer without t‐butyl group material with TBRb fluorescence device showed maximum external quantum efficiency of 15.8%. The t‐TrzCN TADF sensitizer with t‐butyl group material showed maximum external quantum efficiency 17.6%.