Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403076 | Journal of Luminescence | 2009 | 6 Pages |
Abstract
High performance polymer light-emitting diodes (PLEDs) based on a phosphor of noble metal complex bis(1,2-dipheny1-1H-benzoimidazole) iridium (acetylacetonate) [(pbi)2Ir(acac)] doped in poly(N-vinylcarbazole) (PVK) host with various concentration were demonstrated. The photoluminescence (PL) and electroluminescence (EL) spectra of the PLEDs exhibited an emission intensity decrease of PVK and a gradually enhanced feature of (pbi)2Ir(acac) with increased doping concentration. The device with a 5Â wt% (pbi)2Ir(acac) doped PVK system showed a high power efficiency of 3.84Â lm/W and a luminance of 26,006Â cd/m2. The results indicated that both energy transfer and charge trapping have a significant influence on the performance of PLEDs. The devices have a broadened EL spectrum of full-width at half-maximum (FWHM) more than 100Â nm, which can be realized for WOLEDs.
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Authors
Junsheng Yu, Xiaoqing Tang, Lu Li, Yadong Jiang,