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Extremely Efficient White Organic Light‐Emitting Diodes for General Lighting
Author(s) -
Ou QingDong,
Zhou Lei,
Li YanQing,
Shen Su,
Chen JingDe,
Li Chi,
Wang QianKun,
Lee ShuitTong,
Tang JianXin
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201402026
Subject(s) - oled , materials science , optoelectronics , diode , luminance , quantum efficiency , omnidirectional antenna , optics , electrical efficiency , efficient energy use , white light , power (physics) , nanotechnology , computer science , physics , telecommunications , layer (electronics) , quantum mechanics , antenna (radio) , electrical engineering , engineering
Highly power‐efficient white organic light‐emitting diodes (OLEDs) are still challenging to make for applications in high‐quality displays and general lighting due to optical confinement and energy loss during electron‐photon conversion. Here, an efficient white OLED structure is shown that combines deterministic aperiodic nanostructures for broadband quasi‐omnidirectional light extraction and a multilayer energy cascade structure for energy‐efficient photon generation. The external quantum efficiency and power efficiency are raised to 54.6% and 123.4 lm W −1 at 1000 cd m −2 . An extremely small roll‐off in efficiency at high luminance is also obtained, yielding a striking value of 106.5 lm W −1 at 5000 cd m −2 . In addition to a substantial increase in efficiency, this device structure simultaneously offers the superiority of angular color stability over the visible wavelength range compared to conventional OLEDs. It is anticipated that these findings could open up new opportunities to promote white OLEDs for commercial applications.