Efficient Pure-White Phosphorescent OLEDs with High Color Rendering Capability
Resource
Organic Electronics, 11(3), 412-418
Journal
Organic Electronics
Journal Volume
11
Journal Issue
3
Pages
412-418
Date Issued
2010
Date
2010
Author(s)
Chang, Chih-Hao
Tien, Kun-Cheng
Chen, Chung-Chia
Lin, Ming-Shiang
Cheng, Hsing-Chieh
Liu, Su-Hao
Hung, Jui-Yi
Chiu, Yuan-Chieh
Chi, Yun
Abstract
By utilizing a newly developed deep-blue iridium complex along with efficient green and orange-red phosphors, we have successfully demonstrated efficient three-component phosphorescent white-emitting organic light-emitting devices (WOLEDs) with excellent performances. Such WOLEDs were based on the deep-blue phosphorescent OLEDs architecture with double emitting layers and double confining layers; portions of the deep-blue phosphors were selectively replaced with green and orange-red phosphors, thereby forming a structure with the green/orange-red emitting layers sandwiched between the two deep-blue emitting layers. Such three-component phosphorescent WOLEDs yielded a high color rendering index (CRI) of up to 94 and Commission Internationale de l'Eclairage (CIE) coordinates close to the ideal equal-energy white (0.33, 0.33). Furthermore, they exhibited rather stable colors and high CRI over a wide brightness range of 102-104 cd/m2 and yielded electroluminescence efficiencies of up to 10.3%, 24.0 cd/A and 16.4 lm/W for the forward directions. © 2009 Elsevier B.V. All rights reserved.
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