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A Fluorescent Organic Light‐Emitting Diode with 30% External Quantum Efficiency
Author(s) -
Sun Jin Won,
Lee JeongHwan,
Moon ChangKi,
Kim KwonHyeon,
Shin Hyun,
Kim JangJoo
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201401407
Subject(s) - intersystem crossing , quantum efficiency , oled , materials science , fluorescence , optoelectronics , excimer , diode , transition dipole moment , photochemistry , dipole , optics , excited state , nanotechnology , atomic physics , chemistry , physics , singlet state , organic chemistry , layer (electronics)
Almost 100% internal quantum efficiency (IQE) is achieved with a green fluorescent organic light‐emitting diode (OLED) exhibiting 30% external quantum efficiency (EQE). The OLED comprises an exciplex‐forming co‐host system doped with a fluorescent dye that has a strong delayed fluorescence as a result of reverse intersystem crossing (RISC); the exciplex‐forming co‐hosts stimulate energy transfer and charge balance in the system. The orientation of the transition dipole moment of the fluorescent dye is shown to have an influence on the EQE of the device.