摘要
Yellow-light-emitting organic electroluminescent device with multilayer thin-film structure,which shows high brightness and efficiency,is constructed.The hole-transport layer is an N,N'-bis(3-methyphenyl)-N,N'-diphenylbe-nzidine film.The electron-transport layer is an 8-(quinolinolate)-aluminum(A1q)film.The luminescent layer consists of a host material Alq and an emitting dopant 5,6,11,12-petraphenyInaphthacene.The doped device exhibited the maximum emission 40000cd/m^(2) at 19V,and the maximum efficiency of 3.141m/W,which have been improved by about six and three times,respectively,in comparison with that in undoped device.For the unpackaged device,a luminance half-life on the order of about 230 h has been achieved with a constant current density of 15mA/cm^(2),starting at 500cd/m^(2) at the room temperature under ambient atmosphere.
基金
Supported by the National Natural Science Foundation of China under Grant No.69637010
the National“863”Project of China under Grant No.863-307-12-04(02).
