한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Realization of improved efficient White-Organic Light Emitting Diodes with a Thin Electron Blocking Layer

  • Park, Jung-Soo (Opto-Electric Materials Research Center, Korea Institute of Science and Technology , Departments of Physics, Kyung Hee University) ;
  • Lee, Joo-Won (Opto-Electric Materials Research Center, Korea Institute of Science and Technology.) ;
  • Kim, Young-Min (Opto-Electric Materials Research Center, Korea Institute of Science and Technology.) ;
  • Kim, Jai-Kyeong (Opto-Electric Materials Research Center, Korea Institute of Science and Technology.) ;
  • Jang, Jin (Departments of Physics, Kyung Hee University) ;
  • Ju, Byeong-Kwon (Departments of Electrical Engineering, Korea University)
  • Published : 2005.07.19
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Abstract

We have fabricated white organic light emitting diodes. To obtain balanced white emission and improve the efficiency of devices, thin electron blocking layer (TEBL) was inserted between the emitting layers. We showed that the effective injection of electrons through the optimization of TEBL (a - NPD) embodied the balance of spectra and had a possibility of getting white emission. In a device with 0.3 nm a-NPD, it had a maximum power efficiency of 3.80 lm/w at 250 $cd/m^2$, a luminance of 1200 $cd/m^2$ at 100 $mA/cm^2$ , and the CIE coordinates were (0.353, 0.357).

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