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Highly efficient fluorescent blue materials and their applications for top‐emission OLEDs
Author(s) -
Masuda Tetsuya,
Nakano Yuki,
Takahashi Yoshiaki,
Ito Hirokatsu,
Okinaka Keiji,
Kambe Emiko,
Kawamura Yuichiro,
Kuma Hitoshi
Publication year - 2018
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1002/jsid.637
Subject(s) - oled , materials science , optoelectronics , fluorescence , quantum efficiency , photoluminescence , layer (electronics) , dopant , quantum yield , diode , doping , light emitting diode , nanotechnology , optics , physics
We developed new fluorescent blue dopants (BDs) for achieving high‐efficient blue organic light‐emitting diode. A new BD showed both high photoluminescent quantum yield >0.9 and highly horizontal orientation (S′ > 0.9) in doped film with keeping a chemical stability by introducing suitable substituents. We developed hole transporting materials and optimized the combination of hole transporting layers to decrease a carrier accumulation at the interface between electron blocking layer and emission layer. We found that the external quantum efficiency dependency from low to high current density was turned flat by promoting hole injection into emission layer. The top‐emission organic light‐emitting diode using the new BD and the optimized device architecture exhibited high efficiency of L/J/CIEy around 200 at CIEy = 0.043.