摘要
Efficient red polymer light-emitting diodes are fabricated with the single active layer from the blends of poly(N- vinylcarbazole) (PVK) in the presence of 30 wt. % electron-transporting compound 2-(4-biphenylyl)-5-(ptert- butylphenyl)-1,3,4-oxadiazole (PBD) and europium complexes. The polyphenylene functionalized europium com- plex shows an enhanced electroluminescent efficiency due to the large site-isolation effect. For the polyphenylene functionalized europium complex, the maximum external quantum efficiency of 1.90% and luminous efficiency of 2.01 cd A^-1 are achieved with emission peak at 612nm. The maximum brightness is more than 300cd m^-2.
Efficient red polymer light-emitting diodes are fabricated with the single active layer from the blends of poly(N- vinylcarbazole) (PVK) in the presence of 30 wt. % electron-transporting compound 2-(4-biphenylyl)-5-(ptert- butylphenyl)-1,3,4-oxadiazole (PBD) and europium complexes. The polyphenylene functionalized europium com- plex shows an enhanced electroluminescent efficiency due to the large site-isolation effect. For the polyphenylene functionalized europium complex, the maximum external quantum efficiency of 1.90% and luminous efficiency of 2.01 cd A^-1 are achieved with emission peak at 612nm. The maximum brightness is more than 300cd m^-2.
基金
Supported by the National Key Basic Research Programme of China under Grant No 2002CB613403, and the National Natural Science Foundation of China under Grant No 50433030.