반도체디스플레이기술학회지 (Journal of the Semiconductor & Display Technology)

한국반도체디스플레이기술학회 (The Korean Society Of Semiconductor & Display Technology)
권호 표지

연성기판위에 제작된 고효율 Red 인광 OLED의 특성평가

Characterization of High Efficient Red Phosphorescent OLEDs Fabricated on Flexible Substrates

  • 김성현 (전자부품연구원 나노정보에너지연구센터) ;
  • 이유진 (전자부품연구원 나노정보에너지연구센터) ;
  • 변기남 ((주)SKC 중앙연구소 OLEDs팀) ;
  • 정상윤 ((주)SKC 중앙연구소 OLEDs팀) ;
  • 이범성 ((주)SKC 중앙연구소 OLEDs팀) ;
  • 유한성 ((주)SKC 중앙연구소 OLEDs팀)
  • Kim Sung Hyun (Nano-tech. based Information and Energy Storage Research Center, Korea Electronics Technology Institute) ;
  • Lee Yoo Jin (Nano-tech. based Information and Energy Storage Research Center, Korea Electronics Technology Institute) ;
  • Byun Ki Nam (OLED Team, Central R & D Center, SKC Co., Ltd.) ;
  • Jung Sang Yun (OLED Team, Central R & D Center, SKC Co., Ltd.) ;
  • Lee Bum Sung (OLED Team, Central R & D Center, SKC Co., Ltd.) ;
  • Yoo Han Sung (OLED Team, Central R & D Center, SKC Co., Ltd.)
  • 발행 : 2005.06.01
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초록

The organic light-emitting devices(OLEDs) based on fluorescence have low efficiency due to the requirement of spin-symmetry conservation. By using the phosphorescent material, the internal quantum efficiency can reach 100$\%$, compared to 25$\%$ in case of the fluorescent material [1]. Thus recently phosphorescent OLEDs have been extensively studied and showed higher internal quantum efficiency than conventional OLEDs. In this study, we have applied a new Ir complex as a red dopant and fabricated a red phosphorescent OLED on a flexible PC(Polycarbonate) substrate. Also, we have investigated the electrical and optical properties of the devices with a structure of A1/LiF/Alq3/(RD05 doped)BAlq/NPB/2-TNAIA/ITO/PC substrate. Our device showed the lightening efficiency of > 30 cd/A at an initial brightness of 1000 cd/$m^{2}$. The CIE(Commission Internationale de L'Eclairage) coordinates for the device were (0.62,0.37) at a current density of 1 mA/$cm^{2}$. In addition, although the sheet resistance of ITO films on PC substrate is higher than that on glass substrate, the flexible OLED showed much better lightening efficiency without much increase in operating voltage.

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