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34.3: Emitting Materials for Thermally Activated Delayed Fluorescent Organic Light‐Emitting Diodes Using Benzofurocarbazole and Benzothienocarbazole as Donor Moieties
Author(s) -
Lee Dong Ryun,
Lee Chil Won,
Kim Oh Young,
Hwang Seok Ho,
Lee Jun Yeob
Publication year - 2015
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.10443
Subject(s) - phthalonitrile , oled , homo/lumo , fluorescence , photochemistry , acceptor , materials science , diode , quantum efficiency , singlet state , electroluminescence , optoelectronics , chemistry , phthalocyanine , molecule , nanotechnology , optics , excited state , organic chemistry , physics , layer (electronics) , condensed matter physics , nuclear physics
Thermally activated delayed fluorescent (TADF) emitting materials, 4,5‐bis(benzofuro[3,2‐c]carbazol‐5‐yl)phthalonitrile (BFCzPN) and 4,5‐bis(benzo[4,5]thieno[3,2‐c]carbazol‐5‐yl)phthalonitrile (BTCzPN), were synthesized and fabricated as organic light emitting diodes (OLEDs). Benzofurocarbazole and benzothienocarbazole were used as donors and phthalonitrile was an acceptor. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) distribution of BFCzPN and BTCzPN were well separated and small singlet‐triplet energy gap of 0.13 and 0.17 eV were measured, respectively. BFCzPN and BTCzPN showed 12.4 and 11.8% of maximum quantum efficiency as thermally activated delayed fluorescent emitters.