Highly efficient tris(8-hydroxyquinoline) aluminum-based organiclight-emitting diodes utilized by balanced energy transferwith cosensitizing fluorescent dyes

We report on the development of highly efficient organic light-emitting diodes (OLEDs) utilized by balancing the energy transfer between multiple dopants, that is, multiple emissions from the multiple dopants were realized by balanced distributed energy transfer. From the cosensitizing fluorescent O...

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Published in:Applied physics letters 2009-10, Vol.95 (14), p.143305-143305-3
Main Authors: Park, Young Wook, Kim, Young Min, Choi, Jin Hwan, Park, Tae Hyun, Huh, Jin Woo, Kim, Hong Suk, Cho, Min Ju, Choi, Dong Hoon, Ju, Byeong-Kwon
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Summary:We report on the development of highly efficient organic light-emitting diodes (OLEDs) utilized by balancing the energy transfer between multiple dopants, that is, multiple emissions from the multiple dopants were realized by balanced distributed energy transfer. From the cosensitizing fluorescent OLEDs, the peak external quantum efficiency (EQE) of 4.8% at 130   cd / m 2 is demonstrated, which realized theoretical limits of ∼ 5.0 % and means that nearly 100% of the singlet excitons are radiative. Also, the optimized device accompanying thickness-modulated electron transport layer for the enhanced light outcoupling demonstrated the highly improved peak EQE and current efficiency of 6.7%, and 23.4 cd/A.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3243689