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45‐2: Invited Paper : Highly Efficient Acridine‐based TADF Emitters
Author(s) -
Tanmay Chatterjee,
Ken-Tsung Wong
Publication year - 2017
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.11721
Subject(s) - oled , acridine , acceptor , quantum yield , materials science , photochemistry , thermal stability , quantum efficiency , fluorescence , photoluminescence , optoelectronics , chemistry , nanotechnology , optics , organic chemistry , physics , layer (electronics) , condensed matter physics
Organic molecules with efficient thermally activated delayed fluorescence (TADF) are emerging as attractive emitters in OLEDs. In this talk, some of our recent works on acridine‐triazine hybrid TADF materials will be highlighted. One of this series TADF materials exhibits nearly 100% photoluminescence quantum yield, excellent thermal stability, and a horizontal dipole ratio of 83%, leading to extremely efficient blue organic EL with external quantum efficiency (EQE) of ~37%. In addition, efficient and tunable blue‐green to yellow TADF emitters capable of generating OLED EQEs of >31% are developed adopting acridine as donor unit and CN‐substituted benzene, pyridine and pyrimidine as acceptor units are reported. These materials permit one to systematically probe the influence of different acceptor strengths and also the influence of tunable conformations (twist angles) within the acceptor moieties through controlling the orientation of asymmetric heteroaromatic ring relative to the donor component.