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Highly Efficient and Stable Narrow‐Band Phosphorescent Emitters for OLED Applications
Author(s) -
Li Guijie,
Fleetham Tyler,
Turner Eric,
Hang XiaoChun,
Li Jian
Publication year - 2015
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201400341
Subject(s) - phosphorescence , common emitter , oled , materials science , optoelectronics , quantum efficiency , luminance , phosphorescent organic light emitting diode , diode , optics , fluorescence , nanotechnology , physics , layer (electronics)
In order to develop organic light‐emitting diodes with improved optical properties, a series of phosphorescent complexes exhibiting narrow‐band emission spectra are prepared and color tuned to emit efficiently across the whole visible spectrum through a judicious molecular design. Devices employing a green narrow‐band phosphorescent emitter are fabricated and demonstrate an internal quantum efficiency of close to unity and impressive device operational lifetimes, estimate at over 70 000 h at a practical luminance of 100 cd m ‐2 . Additionally, a deep blue narrow‐band emitter is incorporated into a device setting that demonstrates a peak external quantum efficiency of 17.6% and CIE coordinates of (0.14, 0.09).