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23 February 2006 Influence of various doping consistence in EML on the optical and electronic performance of multilayer structure OLED
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Abstract
In this study, four kinds of organic light-emitting diodes were developed using vacuum deposition technique. The typical multilayer structures of OLED are ITO / CuPc(200 Å) / α-NPD(600 Å) / Alq3(400 Å) : C545T(X%) / Alq3(200 Å) /LiF(10 Å) / Al(1000 Å) , X% is the doping consistence in Emitter Layer of OLED. The value is change from 1% to 4%. In this letter, the optical and electronic performance including brightness, efficiency, spectrum etc. was change with the doping consistence. When X% is 1%, the steady voltage of device start working is lower than other structures, only 2.5V. When X% is 3%, the brightness of the device was measured to be 10,500cd times m-2 at the drive voltage 20V, CIE coordinates x=0.331, y=0.625 and maximum luminous efficiency 6.72 lm•W-1 at 5 V. When X% is 4%, the green emission spectrum peak is 550nm, almost reach 555nm (standard green spectrum peak).
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Jian Zhong, Jian-bo Cheng, Wen-bin Chen, Gang Yang, and Quan Jiang "Influence of various doping consistence in EML on the optical and electronic performance of multilayer structure OLED", Proc. SPIE 6117, Organic Photonic Materials and Devices VIII, 61171C (23 February 2006); https://doi.org/10.1117/12.641364
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