کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9559326 | 1381159 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical and electroluminescent properties of polyfluorene copolymers and their blends
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Light emitting properties of several polyfluorene (PF) copolymers (P1-P4) and their blends have been investigated. Light emitting diodes were fabricated with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al. The EL peak wavelengths were 421Â nm (violet), 505, 513Â nm (green) and 570Â nm (yellow) for PF copolymers and 510, 535Â nm (green) for P1/P2 and P1/P3 blends, respectively. Förster energy transfer in the photoluminescence and electroluminescence of the polymer blends P1/P2 and P1/P3 was studied. The LED using the polymer blend P1/P2 showed a turn-on voltage of 2.5Â V and a brightness of 5Ã104Â cd/m2 at 7Â V. The highest external quantum efficiency was observed to be 3.71% at 5Â V. Upon addition of 20Â wt% of the green emitter P2 to the violet emitter P1, the device efficiency increased from 1.18 to 3.71%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 3, 26 January 2005, Pages 811-817
Journal: Polymer - Volume 46, Issue 3, 26 January 2005, Pages 811-817
نویسندگان
Ali Cirpan, Liming Ding, Frank E. Karasz,