Journal
DYES AND PIGMENTS
Volume 120, Issue -, Pages 200-207Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2015.04.020
Keywords
Organic light emitting diodes; Delayed fluorescence; Triplet-triplet annihilation; Deep blue emitter; Spiro[de]benzoanthracene moiety; Charge confinement
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2014R1A2A2A01002417]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea Government Ministry of Trade, Industry and Energy [20134010200490]
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A benzoanthracene-cored deep blue-emitting compound, N-6,N-9-bis(4-cyano-phenyl)-N-3,N-9-diphenylspiro[benzo[de]anthracene-7,9'-fluorenel-3,9-diamine was synthesized and which has an exchange energy of similar to 0.2 eV between the singlet and triplet state. OLED devices doped with this new deep blue emitter showed comparable device performances and delayed fluorescence via the reoccupation of the singlet excitons from the triplet excitons with long lifetimes. In particular, the 10%-doped device exhibited the maximum external quantum efficiency of 14.8% and current efficiency of 15.1 cd/A with Commission International de L'Edairge coordinates of (0.14, 0.11). (C) 2015 Elsevier Ltd. All rights reserved.
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