High-efficiency low color temperature organic light emitting diodes with solution-processed emissive layer |
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Authors: | Jwo-Huei Jou Pei-Yu Hwang Wei-Ben Wang Cheng-Wei Lin Yung-Cheng Jou Yu-Lin Chen Jing-Jong Shyue Shih-Ming Shen Sun-Zen Chen |
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Affiliation: | 1. Department of Materials Science and Engineering, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsinchu 30013, Taiwan, ROC;2. Research Center for Applied Sciences, Academia Sinica, 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan, ROC |
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Abstract: | 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. |
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