【摘 要】
：
An organic electroluminescent (EL) device has been constructed with a double quantum-well structure consisting of N, N-bis-(1-naphthl)-N,N-diphenyl-1,1 -bipheny
【机 构】
：
National Laboratory of Integrated Optoelectronics, Jilin University, Changchun 130023“,”Technische U
论文部分内容阅读
An organic electroluminescent (EL) device has been constructed with a double quantum-well structure consisting of N, N-bis-(1-naphthl)-N,N-diphenyl-1,1 -biphenyl-4,4-diamine (NPB) doped with 5,6,11,12-tetraphenylnaphthacene (rubrene) as a potential well and emitter, and undoped NPB as a barrier potential. The maximum ELefficiency and brightness reach 5.6cd/A and 40000cd/m2, respectively. Most importantly, with the increase of the drive voltage, the EL efficiency (cd/A) declines very slowly after reaching its maximum, almost independent of the drive voltage in a wide range from 5 to 13 V. This characteristic may be useful in the improvement of the lifetime of the device.
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