• Structure and Characteristics of EL Device with PPV as Emitting Layer
  • Park LS, Shin KS, Kim SJ, Shin DS
  • PPV를 발광층으로 한 EL 소자의 구조 및 특성
  • 박이순, 신경석, 김성진, 신동수
Abstract
Electroluminescence(EL) devices with poly(p-phenylene vinylene) (PPV) as light emitting layer (ITO/PPV/Mg) and LiClO4 doped PPV as emitting layer (ITO/LiClO4 doped PPV/Mg) were fabricated. In the ITO/PPV/Mg EL device, the EL intensity increased as the thermal conversion temperature of PPV precursor to PPV decreased from 260 ℃ to 140 ℃. In the ITO/LiClO4 doped PPV/Mg EL device, the threshold voltage for light emission decreased to above 5 volt compared to about 8 volt of ITO/PPV/Mg EL device. The ITO/PVK/PPV/Mg EL device in whice hole transport/electron blocking PVK layer was inserted between ITO and PPV layer showed higher EL intensity and longer life than ITO/PPV/Mg EL device.

발광층으로 poly(p-phenylene vinylene) (PPV)를 사용하여 ITO/PPV/Mg 단층구조의 EL 소자와 PPY 발광층에 LiClO4가 도핑된 ITO/LiClO4 doped PPV/Mg EL 소자를 제작하였다. 단층구조의 EL 소자에서 PPY의 열변환 온도가 260 ℃에서 140 ℃로 낮아질수록 발광 휘도가 증가하였으며 LiC1O4를 도핑하면 문턱 발광전압이 감소되었다. 또 hole transport/electron blocking성질을 가지는 poly(vinyl carbazole) (PVK) 층이 도입된 ITO/PVK/PPV/Mg 이층구조이 EL 소자에 있어서는 ITO/PPV/Mg 단층구조 EL 소자보다 발광 휘도 및 안정성~이 증가됨이 관찰되었다.

Keywords: electroluminescene devices (ELD); organic ELD; polymer ELD; doping of PPV; stability of EL device

References
  • 1. Tang CW, Vanslyke SA, Appl. Phys. Lett., 51, 913 (1987)
  •  
  • 2. Hurroughes JH, Bradley DDC, Brown AR, Marks RN, Mackay K, Friend RH, Burns RL, Holmes AB, Nature, 347, 539 (1990)
  •  
  • 3. Kim DU, Tsutsui T, Saito S, Polymer, 36(12), 2481 (1995)
  •  
  • 4. Strukelj M, Papadimitrakopoulos F, Miller TM, Rothberg LJ, Science, 267(5206), 1969 (1995)
  •  
  • 5. Esteghamatian M, Xu G, Appl. Phys. Lett., 65, 1877 (1994)
  •  
  • 6. Pei QB, Yu G, Zhang C, Yang Y, Heeger AJ, Science, 269(5227), 1086 (1995)
  •  
  • 7. Park LS, Shin KS, Polym.(Korea), 19(6), 875 (1995)
  •  
  • 8. Park LS, Lee SN, Han YS, Shin KS, Mol. Cryst. Liq. Cryst., 280(-), 337 (1996)
  •  
  • 9. Gagnon DR, Capistran JD, Karasz FE, Lenz RW, Polymer, 28, 567 (1987)
  •  
  • 10. Park LS, Shin KSPatent is pending on part of this work (1996)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 1997; 21(4): 590-596

    Published online Jul 25, 1997