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      https://www.ias.ac.in/article/fulltext/pram/077/04/0727-0734

    • Keywords

       

      Electrical and optical characteristics; injection materials; red organic light-emitting diode; amorphous fluoropolymer; luminous efficiency; external quantum efficiency.

    • Abstract

       

      This study examined the electrical and optical properties of red OLEDs (organic lightemitting diodes) with a four-layer structure, ITO/amorphous fluoropolymer (AF)/$N,N'$--diphenyl$N,N'$-bis(3-methylphenyl)-1, 1-biphenyl-4,$4'$-diamine (TPD)/R-H:R-D/lithium fluoride (LiF)/Al, containing a hole injection material, AF (amorphous fluoropolymer) and an electron injection material, LiF. Compared to the basic structure (two-layer structure), the brightness and luminous efficiency of the four-layer structure, ITO/TPD/R-H:R-D/Al, increased approximately 100 times (30,000 lm/m2) and 150 times (51 lm/W), respectively, with an applied voltage. The excellent efficiency of the external proton was also increased 150 times (0.51%). That is, the hole and electron injection layers improved the surface roughness of ITO and Al, and the interfacial physical properties. In addition, these layers allowed the smooth injection of holes and electrons. The luminance, luminous efficiency and external quantum efficiency were attributed to an increase in the recombination rates.

    • Author Affiliations

       

      Jong-Yeol Shin1 Hyun-Min Choi2 Hyeon-Seok Han2 Jin-Woong Hong2

      1. Department of Car Mechatronics, Sahmyook University, Nowon-Gu, Seoul, Korea (139-742)
      2. Department of Electrical Engineering, Kwangwoon University, Nowon-Gu, Seoul, Korea (139-701)
    • Dates

       
  • Pramana – Journal of Physics | News

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