Journal
ORGANIC ELECTRONICS
Volume 12, Issue 1, Pages 29-33Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2010.10.006
Keywords
White organic light-emitting diode; Fluorescent; Beryllium complex; Energy transfer; Color rendering index
Funding
- National Basic Research Program of China (973 Program) [2009CB623600]
- Natural Science Foundation of China [50733002, 50903036]
- Jilin Provincial Science and Technology Bureau of Jilin Province [20070107]
- MOST of China [10409A111463]
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This paper reports a highly efficient organic light-emitting diode (OLED) with high-quality white emission that employs a deep blue-emitting beryllium complex bis(2-(2-hydroxyphenyl)-pyridine) beryllium (Bepp(2)) doped with a wide-bandwidth orange-emitting fluorescent dye 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4-H-pyran (DCM) through incomplete energy transfer from the blue host to the orange dopant. The two-component WOLED exhibits ideal and stable CIE coordinates (0.334 +/- 0.002, 0.337 +/- 0.007) with a high color rendering index equal to 79-81 upon variation in brightness from 10 to 10,000 cd m (2). As an all-fluorophore-doped white OLED, it yields very high EL efficiencies with the peak luminescence efficiency. The peak value of luminescence efficiency (LE), power efficiency (PE), and external quantum efficiency (EQE) is 14.0 +/- 0.35 cd A (1), 9.2 +/- 0.25 lmW (1), and 5.6 +/- 0.15%, respectively. (C) 2010 Elsevier B. V. All rights reserved.
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