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The Korean Infomation Display Society (한국정보디스플레이학회)
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Efficient Organic Light-emitting Diodes by Insertion a Thin Lithium Fluoride Layer with Conventional Structure

  • Kim, Young-Min (Display and Nanosystem Laboratory, The College of Engineering, Korea University, The Opto-Electronic Materials Research Center, Korea Institute of Science and Technology) ;
  • Park, Young-Wook (Display and Nanosystem Laboratory, The College of Engineering, Korea University) ;
  • Choi, Jin-Hwan (Display and Nanosystem Laboratory, The College of Engineering, Korea University) ;
  • Kim, Jai-Kyeong (The Opto-Electronic Materials Research Center, Korea Institute of Science and Technology) ;
  • Ju, Byeong-Kwon (Display and Nanosystem Laboratory, The College of Engineering, Korea University)
  • Published : 2006.06.24
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Abstract

Insertion of a thin lithium fluoride (TLF) layer between an emitting layer (EML) and an electron transporting layer has resumed in the developement of a highly efficient and bright organic light-emitting diode (OLED). Comparing with the performance of the device as a function of position with the TLF layer in tris-(8-hydroxyquinoline) aluminum $(Alq_{3})$, we propose the optimal position for the TLF layer in the stacked structure. The fabricated OLED shows a luminance efficiency of more than 20 cd/A, a power efficiency of 12 Im/W (at 20 mA/$cm^{2}$), and a luminance of more than 22 000 cd/$m^{2}$ (at 100 mA/$cm^{2}$), respectively. We suggest that the enhanced performance of the OLED is probably attributed to the improvement of carrier balance to achieve a high level of recombination efficiency in an EML.

Keywords

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