共 25 条
Highly efficient multilayer organic pure blue light emitting diodes with substituted carbazoles compounds in the emitting layer
被引:22
作者:
Fischer, A
[1
]
Chénais, S
Forget, S
Castex, MC
Adès, D
Siove, A
Denis, C
Maisse, P
Geffroy, B
机构:
[1] Univ Paris 13, Inst Galilee, Phys Lasers Lab, F-93430 Villetaneuse, France
[2] Univ Paris 13, Inst Galilee, CNRS, BPS B20A, F-75010 Villetaneuse, France
[3] Univ Paris 07, Fac Med Lariboisiere St Louis, F-75010 Paris, France
[4] CEA Saclay, Lab Cellules & Composants, LITEN, DSEN, F-91191 Gif Sur Yvette, France
关键词:
D O I:
10.1088/0022-3727/39/5/004
中图分类号:
O59 [应用物理学];
学科分类号:
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 CIE coordinates (x = 0.153, y = 0.100), electroluminescence efficiency eta(EL) of 0.4 cd A(-1), external quantum efficiency eta(ext) of 0.6% and luminance L of 236 cd m(-2) (at 60 mA cm(-2)) 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 eta(EL) of 4.7 cd A(-1) and eta(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, lambda(peak) = 456 nm). The eta(ext) value is one the highest reported at this wavelength for blue OLEDs and is related to an internal quantum efficiency up to 20%.
引用
收藏
页码:917 / 922
页数:6
相关论文