摘要
研究了新型高效蓝色掺杂剂EBDP的电致发光性能.分别以EBDP为掺杂剂制备了结构为氧化铟锡(ITO)/酞菁铜(CuPc)/N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺(NPB)/2-叔丁基-9,10-二-(2-萘基)蒽(TBADN):EBDP/8-羟基喹啉铝(Alq3)/LiF/Al与ITO/CuPc/NPB/TBADN:EBDP:4-二氰亚甲基-2-叔丁基-6-(1,1,7,7-四甲基久咯呢定基-9-烯基)-4H-吡喃/Alq3/LiF/Al的蓝色和白色电致发光器件.蓝色器件在400mA/cm2电流密度驱动下的发光亮度达26961cd/m2,最大发光效率为8·29cd/A,在20mA/cm2电流密度驱动下的发光亮度为1597cd/m2;白色器件在400mA/cm2电流密度驱动下的发光亮度达32291cd/m2,最大发光效率为8·31cd/A,在20mA/cm2电流密度驱动下的亮度为1413cd/m2.测量了器件的发光效率与电流密度关系,随电流密度增加发光效率的衰减很缓慢,说明掺杂剂的激子-激子湮没较弱,这是由于掺杂剂的非平面结构增加了空间位阻造成的.
In this paper the electroluminescene of highly efficient blue dopant EBDP was investigated. The blue and white organic light emitting diodes with the structure : indium-tin oxide ( ITO ) / copper phthalocyanine ( CuPc ) / N, N' -bis- ( 1-naphenyl ) - N, N' - biphenyl-1, 1'-biphenyl-4-4'-diamine ( NPB )/2-t-butyl-9, 10-di-( 2-naphthyl ) anthracene ( TBADN ) : EBDP/tris ( 8- hydroxyquinoline) aluminum ( Alq3 )/LiF/Al and ITO/CuPc/NPB/TBADN : EBDP: 4- (dicyanomethylene) -2-t- butyl-6- ( 1,1,7,7- tetramethyljulolidyl-9-enyl)-4H-pyran/Alq3/LiF/Al were studied by using EBDP as blue dopant. For the blue device, the maximum luminance was 26961 cd/m^2, and its maximum efficiency was 8.29 cd/A. The luminance at a current density 20 mA/cm^2 was 1597 cd/m^2. For the white device, the maximum luminance 32291 cd/m^2 and maximum efficiency 8.31 cd/A, the luminance of 1413 ed/m^2 at a current density 20 mA/cm^2 were obtained. The slow decrease of efficiency with the increase of current density indicates weak exciton-exeiton annihilation, which results from the large sterie hindrance due to a non-planar structure of the fluorescence dye EBDP.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期2008-2013,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:90201034
60477014)
国家重点基础研究发展规划(批准号:2002CB613400)资助的课题.
关键词
有机电致发光
蓝色掺杂剂
蓝色电致发光器件
白色电致发光器件
organic electroluminescence, blue dopant, blue electroluminescent devices, white electroluminescent devices