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http://dx.doi.org/10.4313/JKEM.2011.24.6.486

Effect of Doping Profile of Blue Activator on the Emission Characteristics of White Organic Light Emitting Diodes  

Lim, Byung-Gwan (Department of Electronic Engineering, Daejin University)
Seo, Jung-Hyun (Department of Advanced Materials Science & Engineering, Daejin University)
Paek, Kyeong-Kap (Department of Electronic Engineering, Daejin University)
Ju, Sung-Hoo (Department of Advanced Materials Science & Engineering, Daejin University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.6, 2011 , pp. 486-490 More about this Journal
Abstract
To investigate the effect of two-emission-layer structure on the emission characteristics of the phosphorescent white organic light-emitting diodes (PHWOLEDs), the PHWOLEDs with two different emission layers, blue EML(29 nm, FIrpic-doped mCP) and red EML(1 nm, Ir(pq)$_2$acac-doped CBP)), following host-guest system were fabricated. The bi-layered blue EML was composed of mCP:FIrpic (20 nm, 7 vol.%) and mCP:FIrpic (9 nm, 7, 10, 15, 20, and 25 vol.%, respectively). When the concentration of FIrpic was increased from 7 to 15 vol.%, light emission luminance, current efficiency, and external quantum efficiency were increased. On the contrary, when the concentration of FIrpic was increased to more than 20 vol.%, light emission luminance, current efficiency, and external quantum efficiency were decreased. The PHWOLEDs with the bi-layered blue EML structure of mCP:FIrpic (20 nm, 7 vol.%) and mCP:FIrpic (9 nm, 15 vol.%) showed current efficiency of 29.7 cd/A and external quantum efficiency (EQE) of 16.6% at 1,000 $cd/cm^2$.
Keywords
Doping; Efficiency; OLED; Phosphorescence; White;
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