在发光层中具有取代咔唑化合物的高效多层有机纯蓝光发光二极管
Highly efficient multilayer organic pure-blue-light emitting diodes with substituted carbazoles compounds in the emitting layer
摘要：
描述了基于1，4，5，8，N-五甲基咔唑（PMC）和N-乙基咔唑（N，N ′-二乙基-3，3 ′-联咔唑）的二聚体（DEC）作为发光层或作为4，4 ′-双（2，2 ′-二苯基乙烯基）-1，1 ′-联苯（DPVBi）基质中的掺杂剂的亮蓝色有机发光二极管（OLED）。获得了C. I.E.坐标x = 0.153 y = 0.100的纯蓝光，电致发光效率η EL为0.4 cd/A，外量子效率η ext.在五层发光器件中，以PMC为发光体，2，9-二甲基-4，7-二苯基-1，10-菲咯啉（BCP）为空穴阻挡材料，获得了0.6%的发光效率和236 cd/m2的亮度L（60 mA/cm 2）.最高效率η_{EL.}采用四层结构和掺杂DPVBi DEC的有源层（CIE坐标x = 0.158，y=0.169，λ peak = 456 nm），获得了4.7 cd/A，η ext = 3.3%的器件性能。η_{ext.}值是在该波长下对于蓝色OLED报道的最高值之一，并且与高达20%的内部量子效率相关。
英文摘要：
Bright blue organic light-emitting diodes (OLEDs) based on 1,4,5,8,N-pentamethylcarbazole (PMC) and on dimer of N-ethylcarbazole (N,N'-diethyl-3,3'-bicarbazyl) (DEC) as emitting layers or as dopants in a 4,4'-bis(2,2'-diphenylvinyl)-1,1'-biphenyl (DPVBi) matrix are described. Pure blue-light with the C.I.E. coordinates x = 0.153 y = 0.100, electroluminescence efficiency η_{EL} of 0.4 cd/A, external quantum efficiency η_{ext.} of 0.6% and luminance L of 236 cd/m2 (at 60 mA/cm2) were obtained with PMC as an emitter and the 2,9-dimethyl-4,7-diphenyl-1,10-phenantroline (BCP) as a hole-blocking material in five-layer emitting devices. The highest efficiencies η_{EL.} of 4.7 cd/A, and η_{ext} = 3.3% were obtained with a four-layer structure and a DPVBi DEC-doped active layer (CIE coordinates x = 0.158, y=0.169, λ_{peak} = 456 nm). The η_{ext.} value is one the highest reported at this wavelength for blue OLEDs and is related to an internal quantum efficiency up to 20%.
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