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http://dx.doi.org/10.5695/JKISE.2013.46.2.093

Emission Characteristics of White Organic Light-Emitting Diodes Using Micro Lens Array Film  

Chun, Hyun-Dong (Department of Advanced Materials Science & Engineering, Daejin University)
Na, Hyunseok (Department of Advanced Materials Science & Engineering, Daejin University)
Yang, Jae-Woong (Department of Advanced Materials Science & Engineering, Daejin University)
Ju, Sung-Hoo (Department of Advanced Materials Science & Engineering, Daejin University)
Publication Information
Journal of the Korean institute of surface engineering / v.46, no.2, 2013 , pp. 93-97 More about this Journal
Abstract
We studied the emission characteristics of white phosphorescent organic light-emitting diodes (PHOLEDs), which were fabricated using a two-wavelength method. To optimize emission characteristics of white PHOLEDs, white PHOLEDs with co-doping and blue/co-doping emitting layer (EML) structures were fabricated using a host-dopant system. The total thickness of light-emitting layer was 25 nm and the dopant of blue and red was FIrpic and $Bt_2Ir(acac)$ in UGH3, respectively. In case of co-doping structure, applying micro lens array film showed efficiency improvement from the current efficiency 78.5 cd/A and power efficiency 40.4 lm/W to the current efficiency 131.1 cd/A and power efficiency 65 lm/W and blue / co-doping structure showed efficiency improvement from the current efficiency 43.8 cd/A and power efficiency 22 lm/W to the current efficiency 69 cd/A and power efficiency 32 lm/W.
Keywords
OLED; White; MLA; Efficiency; Spectrum;
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