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P‐179: Design and Synthesis of Blue Thermally Activated Delayed Fluorescent Emitter with Strong PyCN Acceptor and Multi Donors
Author(s) -
Lee Ui Gun,
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.14322
Subject(s) - homo/lumo , common emitter , fluorescence , acceptor , photoluminescence , quantum efficiency , materials science , molecule , photochemistry , band gap , electron acceptor , chemistry , optoelectronics , optics , physics , organic chemistry , condensed matter physics
A thermally activated delayed fluorescence (TADF) emitter of 234CzPyCN was synthesized to study the effect of strong acceptor (PyCN) and strong multi donors on the TADF properties. Electrical and Photophysical properties of the TADF emitters were characterized by the electron donating and accepting strength of the molecule. The material was designed by uniting multiple carbazoles which are substituted at ortho, meta, and para positions relative to the PyCN that is applied as electron accepting unit. Energy band gap between the highest occupied molecular orbital (HOMO) and the lowest occupied molecular orbital (LUMO) was measured to be 2.97 eV. The maximum photoluminescence emission peak of 234CzPyCN was 479 nm. 234CzPyCN device presented maximum external quantum efficiency of 20.8% with a CIE color coordinate of (0.18, 0.37).