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Improved Blue-Green Electrophosphorescence from a Tuning Iridium Complex with Benzyl Group in Polymer Light-Emitting Devices |
| MA Xiao-Yun1;ZHU Ke-Ming1;WANG Lei3 ;XIAO Fang-Liang1;WEN Zhong-Lin1;ZHU Mei-Xiang1;ZHU Wei-Guo 1,2 |
| 1College of Chemistry, Xiangtan University, Xiangtan 4111052Key Lab of Environment-Friendly Chemistry and Application of the Ministry of Education, Xiangtan University, Xiangtan 4111053Institute of Polymer Optoelectronics Materials and Devices, South China University of Technology, Guangzhou 510640 |
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MA Xiao-Yun, ZHU Ke-Ming, WANG Lei et al 2008 Chin. Phys. Lett. 25 711-714 |
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Abstract Electroluminescence performances from a tuning biscyclometlated iridium complex with benzyl group are demonstrated in double-layered polymer light-emitting devices (PLEDs) using a blend of poly(9,9-dioctylfluorene) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix. Blue-green electrophosphorescent emission with a peak at 521nm and a shoulder at 492nm was observed. The highest luminance efficiency of 4.8cd/A at current density of 0.56mA/cm2 and a maximum luminance of 1944cd/m2 at 217.6mA/cm2 were achieved in the devices at the dopant concentration of 8%. The luminous performance of the devices becomes better with increasing dopant concentrations from 1% → 8%. This implies that the concentration quenching of this iridium complex with benzyl group can be efficiently inhibited
in the devices.
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| Keywords:
78.60.Fi
78.66.Qn
85.06.Jb
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Received: 10 August 2007
Published: 30 January 2008
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