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P‐173: Engineering of Linker Unit for Blue Thermally Activated Delayed Fluorescent Organic Light‐Emitting Diodes
Author(s) -
Kim Do Sik,
Lee Kyung Hyung,
Hong Wan Pyo,
Song Ok Keun,
Lee Jun Yeob
Publication year - 2019
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.13330
Subject(s) - homo/lumo , photoluminescence , quantum efficiency , fluorescence , oled , materials science , band gap , singlet state , linker , photochemistry , molecule , optoelectronics , chemistry , excited state , nanotechnology , atomic physics , optics , physics , organic chemistry , layer (electronics) , computer science , operating system
A series of thermally activated delayed fluorescence (TADF) emitters of TrzCz1 and TrzCz2 are synthesized to study the effect of linker engineering on the TADF properties. Photophysical and electrical properties of TADF emitters were characterized by the electron donating strength of the molecule by integrating biscarbazole and t‐butylcarbazole electron donating units and triazine electron withdrawing unit. Energy bandgap between the highest occupied molecular orbital (HOMO) and the lowest occupied molecular orbital (LUMO) was tuned by changing the electron donating strength of the molecule. t‐butylcarbazole based molecule TrzCz2 (0.13 eV) showed smaller singlet‐triplet energy gap than TrzCz1 (0.20 eV), and the maximum photoluminescence emission peaks of TrzCz1 and TrzCz2 were 443 and 433nm. TrzCz1 device showed maximum external quantum efficiency of 22.4% with a CIE color coordinate of (0.17, 0.28) and TrzCz2 showed maximum external quantum efficiency of 9.9% with a CIE color coordinate of (0.15, 0.09)