Title :
Efficiency of organic light-emitting diodes depending on Al based cathodes
Author :
Kim, Sang Keol ; Chun, Dong Hoe ; Oh, Hyun Seok ; Lee, Heon Don ; Jang, Kyung Uk ; Song, Min Jong ; Kim, Tae Wan
Author_Institution :
Dept. of Phys., Hong Ik Univ., Seoul, South Korea
Abstract :
We have investigated the effects of cathode in a device structure of ITO/TPD/Alq3/cathode with cathodes of Al, LiF/Al, LiAl, and Ca/Al by measuring the current-voltage-luminance characteristics at room temperature. The device with LiF/Al cathode shows an improvement of external quantum efficiency approximately by a factor of ten compared with Al cathode only device. Our observation shows that the energy barrier-height in cathode side is important in improving the efficiency of the organic light-emitting diodes.
Keywords :
aluminium compounds; electrochemical electrodes; electroluminescence; indium compounds; organic compounds; organic light emitting diodes; semiconductor materials; semiconductor thin films; tin compounds; 293 to 298 K; Al based cathodes; Ca/Al cathodes; ITO; ITO/TPD/Alq3/cathode; InSnO; LiAl cathodes; LiF/Al cathodes; current-voltage-luminance properties; device structure; energy barrier-height; external quantum efficiency; organic light-emitting diodes efficiency; room temperature; Artificial intelligence; Automotive engineering; Cathodes; Educational institutions; Light emitting diodes; Organic light emitting diodes; Radiative recombination; Spontaneous emission; Temperature; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218522
