Title :
Mixed spacer effect of hybrid white organic light-emitting diodes for reduced efficiency roll-off
Author :
Seo, Ji Hoon ; Park, Jung Sun ; Koo, Ja Ryong ; Seo, Bo Min ; Lee, Kum Hee ; Yoon, Seung Soo ; Kim, Young Kwan
Author_Institution :
Dept. of Inf. Display, Hongik Univ., Seoul, South Korea
Abstract :
The authors have demonstrated mixed spacer (MS) effect of hybrid white organic light-emitting diodes (HWOLEDs) for reduced efficiency roll-off using fluorescent blue emitter and phosphorescent red emitter. The optimized HWOLED with MS ratio (1:3) which was 4,4\´,4"tris (N-carbazolyl) triphenylamine and bis-(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium exhibited a maximum luminance of 42200 cd/m2 at 8.5 V, external quantum and power efficiencies of 10.3% and 19.0 lm/W, and Commission Internationale de I\´Eclairage coordinates of (0.40, 0.41) at 1 000 cd/m2.
Keywords :
aluminium compounds; organic compounds; organic light emitting diodes; 4,4\´,4"tris (N-carbazolyl) triphenylamine; Commission Internationale de I\´Eclairage coordinates; bis-(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium; external quantum efficiency; fluorescent blue emitter; hybrid white organic light-emitting diodes; maximum luminance; mixed spacer effect; phosphorescent red emitter; power efficiency; reduced efficiency roll-off; voltage 8.5 V; Current density; Fabrication; Flat panel displays; Fluorescence; Glass; Indium tin oxide; Organic light emitting diodes; Organic materials; Phosphorescence; Voltage;
Conference_Titel :
Nanoelectronics Conference (INEC), 2010 3rd International
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-3543-2
Electronic_ISBN :
978-1-4244-3544-9
DOI :
10.1109/INEC.2010.5424940
