Title :
Improving the Luminous Efficiency of Organic Light Emitting Diodes using a Modulated Doping Hole Injection Layer
Author :
Su, Shui-Hsiang ; Hou, Cheng-Chieh ; Chang, Chih-Kai ; Huang, Zheng-Wei ; Yokoyama, Meiso
Author_Institution :
Dept. of Electron. Eng., I-Shou Univ., Taiwan
Abstract :
Modulated doping of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane (F4-TCNQ) in a hole injection layer (HIL) of 4,4\´,4"-tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine (m-MTDATA) was investigated. The device fabricated with an indium-tin-oxide (ITO)/ m-MTDATA:chi% F4-TCNQ/N\´-di(naphthalen-1-yl)-N,N\´-diphenyl-benzidine (NPB)/tris-(8-hydroxyquinolinato) aluminum(III) (Alq3)/LiF/Al structure was optimized by adjusting the doping concentration and region in HIL to enhance device\´s efficiency and luminance. 4, 7-diphenyl-1, 10-phenanthroline (BPhen) is used as a hole blocking layer (HBL). Moreover, F4-TCNQ is inserted in the m-MTDATA to study the emission characteristics of OLEDs. The OLED having an efficiency up to 12 cd/A is achieved in the study
Keywords :
doping profiles; organic light emitting diodes; 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane; 4, 7-diphenyl-1, 10-phenanthroline; 4,4\´,4"-tris(N-3-methylphenyl-N-phenyl-amino)-triphenylamine; BPhen; F4-TCNQ; N\´-di(naphthalen-1-yl)-N,N\´-diphenyl-benzidine; OLED; doping concentration; hole blocking layer; luminous efficiency; m-MTDATA; modulated doping hole injection layer; organic light emitting diodes; tris-(8-hydroxyquinolinato) aluminum; Cathodes; Doping; Electroluminescent devices; Electron emission; Flat panel displays; Glass; Indium tin oxide; Nitrogen; Optical modulation; Organic light emitting diodes;
Conference_Titel :
Junction Technology, 2006. IWJT '06. International Workshop on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0047-3
DOI :
10.1109/IWJT.2006.220910
