High-efficiency low color temperature organic light emitting diodes with solution-processed emissive layer

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• 作者：Jwo-Huei Jou^a ; ^{jjou@mx.nthu.edu.tw} ; Pei-Yu Hwang^a ; Wei-Ben Wang^a ; Cheng-Wei Lin^a ; Yung-Cheng Jou^a ; Yu-Lin Chen^a ; Jing-Jong Shyue^b ; Shih-Ming Shen^a ; Sun-Zen Chen^a
• 关键词：High-efficiency ; Low color temperature ; Organic light emitting diodes ; Solution process
• 刊名：Organic Electronics
• 出版年：2012
• 期刊代码：137_15661199
• 类别：et
• 出版时间：May, 2012
• 卷：13
• 期：5
• 页码：899-904
• 文件大小：554 K

摘要

Low color temperature (CT) lighting provides a warm and comfortable atmosphere and shows mild effect on melatonin suppression. A high-efficiency low CT organic light emitting diode can be easily fabricated by spin coating a single white emission layer. The resultant white device shows an external quantum efficiency (EQE) of 22.8%(34.9 lm/W) with CT 2860 K at 100 cd/m², while is shown 18.8%(24.5 lm/W) at 1000 cd/m². The high efficiency may be attributed to the use of electroluminescence efficient materials and the ambipolar-transport host. Besides, proper device architecture design enables excitons to form on the host and allows effective energy transfer from host to guest or from high triplet guest to low counterparts. By decreasing the doping concentration of blue dye in the white emission layer, the device exhibited an orange emission with a CT of 2280 K. An EQE improvement was observed for the device, whose EQE was 27.4%(38.8 lm/W) at 100 cd/m² and 20.4%(24.6 lm/W) at 1000 cd/m².