Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403223 | Journal of Luminescence | 2008 | 4 Pages |
Abstract
High-performance undoped white organic light-emitting diode (OLED) has been fabricated using an ultrathin yellow-emitting layer of 5,6,11,12-tetraphenylnaphthacene (rubrene) inserted at two sides of interface between two N,Nâ²-bis-(1-naphthyl)-N,Nâ²- biphenyl-1,1â²-biphenyl-4,4â²- diamine (NPB) layers as a hole transporting and blue emissive layer, respectively. The results showed that a maximum luminance of the device reached to as high as 21,500Â cd/m2 at 15Â V. The power efficiencies of 2.5 and 1.6Â lm/W at a luminance of 1000 and 10000Â cd/m2, respectively, were obtained. The peaks of electroluminescent (EL) spectra locate at 429 and 560Â nm corresponding to the Commissions Internationale De L'Eclairage (CIE) coordinates of (0.32, 0.33), which is independent of bias voltage. The performance enhancement of the device may result from direct charge carrier trapping in rubrene. Energy transfer mechanism was also found in the EL process.
Related Topics
Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
Lu Li, Junsheng Yu, Xiaoqing Tang, Tao Wang, Wei Li, Yadong Jiang,