结合有机发光和光电二极管器件,制作了一种新型的有机光电开关器件。器件结构为:ITO/NPB/Alq3/CuPc/C60/NPB/Alq3/LiF/Al。其中,ITO(indium tin oxide,氧化铟锡)为正极,NPB[N,N′-di(naphthaleneyl)-N,N′-diphenylbenzidine]/Alq3[tris-(8-hydro-xyquinoline,8-羟基喹啉铝) aluminum]作为电致发光层,CuPc(Copper Phthalocyanine,酞菁铜)/C60为光电转换层,LiF/Al为器件负极,即两个电致发光层和一个光电转换层组成的三明治型结构。从低向高施加电压和从高向低施加电压时,该器件呈现出不同的电流密度-电压(J-V)和功率密度电压(P-V)曲线,即器件在相同的电压下可得到不同的电流密度值和功率密度值(亮度值),利用高亮度状态(ON)到低亮度状态(OFF)的转变,可实现开关型有机电致发光器件。器件的光电转换层吸收效率为0.153%。

A new type of organic electro-optic device combining an organic light emitting diode with an organic photovoltaic cell is studied. The structure is ITO/NPB/Alq3/CuPc/C60/NPB/Alq3/LiF/Al. NPB/Alq3 functions as the light-emitting layer; meanwhile CuPc/C60 functions as a photonic/electric energy transfer cell. The device presents different current density-voltage and power density-voltage curves when in the forward voltage scan then in the backward voltage scan. These transition from a high (ON) to low (OFF) luminance renders a prototype to realize a switchable organic electroluminescence. The conversion efficiency of the optioelectric layer is 0.153%. Several methods to improve the conversion efficiency are also discussed.