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,...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/m^(2), 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.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.59973007 and 60077014。
文摘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/m^(2), 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.
