WEI Han-zhi, LI Wen-lian, SU Wen-ming, LI Ming-tao, LI Bin, HONG Zi-ruo. Efficient Organic Light Emitting Diodes with Europium Complex by Using Alternate Multilayer Hole-transporting Layer[J]. Chinese Journal of Luminescence, 2004,25(3): 329-331
WEI Han-zhi, LI Wen-lian, SU Wen-ming, LI Ming-tao, LI Bin, HONG Zi-ruo. Efficient Organic Light Emitting Diodes with Europium Complex by Using Alternate Multilayer Hole-transporting Layer[J]. Chinese Journal of Luminescence, 2004,25(3): 329-331DOI:
Red organic light emitting diodes (OLEDs) emitted from europium (Eu) complex have been fabricated. To get high purity characteristic emissiom from Eu-complex
2
9-dimethyl-4
7-diphenyl-1
10-phenanthroline (BCP) was introduced as hole blocking layer. By introducing an alternate multilayer of 4
5-tris-(3-methylphenylphenylamino) triphenylamine (m-MTDATA) as hole-transporting layer which can confines the surplus holes injected from the ITO anode
compared with the conventional heterostructure device
the luminous efficiency and the maximum brightness can be improved significantly
the maximum luminous efficiency and the maximum brightness of the red EL emission are 3 cd/A at the current density of 2.8mA/cm
2
and 670cd/m
2
at the current density of 170mA/cm
2
respectively. The mechanism to improve the red device performance with Eu-complex by the AM hole-transporting layer and effect of BCP on the emission characte ristic of the devices were also discussed.