Journal
SYNTHETIC METALS
Volume 209, Issue -, Pages 47-54Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2015.06.022
Keywords
Organic light emitting diodes; Thermally activated delayed fluorescence; Ideal doping concentration; Highly polar charge transfer materials
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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As a promising way to realize highly efficient organic light-emitting diodes (OLEDs), thermally activated delayed fluorescence (TADF) has been extensively investigated to find various types of host and dopant molecules that have small singlet-triplet exchange energy. In this study, we suggest the ideal combination of host and dopant systems showing enhanced external quantum efficiency characteristics as well as stabilized color behavior based on an ideal doping concentration concept which has been conventionally applied for the realization of highly efficient phosphorescent OLED. For a TADF mechanism, both Forster and Dexter energy transfer mechanisms are required simultaneously. We investigate the TADF mechanism by realizing red fluorescent OLED devices utilizing 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran, and 2,3,5,6-tetrakis(3,6-diphenylcarbazol-9-yl)-1,4-dicyanobenzene as dopants. (c) 2015 Elsevier B.V. All rights reserved.
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