title: A multi-zoned white organic light-emitting diode with high CRI and low color temperature.
abstract: White organic light emitting diodes (WOLEDs) is becoming a new platform technology for a range of applications such as flat-panel displays, solid-state lightings etc., and are under intensive research. For general solid-state illumination applications, a WOLED's color rendering index (CRI) and correlated color temperature (CCT) are two crucial parameters. This paper reports that WOLED device structures can be constructed using four stacked emission layers which independently emit lights at blue, green, yellow and red color respectively. The intensity of each emission layer is then engineered by funneling excitons to the targeted emission layer to achieve an ultrahigh 92 CRI at 5000 cd/m(2), and to reduce CCT to below 2500 K.
authors: Department of Physics, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.|Yunnan Key Laboratory for Micro/Nano Materials &Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.
authors: Tao
authors: T
authors: Zhang
authors: Department of Physics, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.|Yunnan Key Laboratory for Micro/Nano Materials &Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.
authors: Shou-Jie
authors: SJ
authors: He
authors: Department of Physics, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.|Yunnan Key Laboratory for Micro/Nano Materials &Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.
authors: Deng-Ke
authors: DK
authors: Wang
authors: Department of Physics, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.|Yunnan Key Laboratory for Micro/Nano Materials &Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.
authors: Nan
authors: N
authors: Jiang
authors: Department of Physics, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.|Yunnan Key Laboratory for Micro/Nano Materials &Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China.|Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada.
authors: Zheng-Hong
authors: ZH
authors: Lu