Journal of the Microelectronics and Packaging Society (마이크로전자및패키징학회지)

The Korean Microelectronics and Packaging Society (한국마이크로전자및패키징학회)
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Light Efficiency of LED Package with TiO2-nanoparticle-dispersed Encapsulant

TiO2 나노입자가 혼합된 봉지재를 적용한 LED 패키지의 광효율 특성 평가

  • Lee, Tae-Young (Advanced Welding and Joining R&BD Group, Korea Institute of Industrial Technology) ;
  • Kim, Kyoung-Ho (Advanced Welding and Joining R&BD Group, Korea Institute of Industrial Technology) ;
  • Kim, Mi-Song (Advanced Welding and Joining R&BD Group, Korea Institute of Industrial Technology) ;
  • Ko, Eun-Soo (EI Lighting Co., Ltd.) ;
  • Chio, Jong-Hyun (EI Lighting Co., Ltd.) ;
  • Moon, Kyoung-Sik (School of Materials Science and Engineering, Georgia Institute of Technology) ;
  • Kim, Mok-Soon (Dept. of Materials Science and Engineering, Inha University) ;
  • Yoo, Sehoon (Advanced Welding and Joining R&BD Group, Korea Institute of Industrial Technology)
  • 이태영 (한국생산기술연구원 용접접합연구실용화그룹) ;
  • 김경호 (한국생산기술연구원 용접접합연구실용화그룹) ;
  • 김미송 (한국생산기술연구원 용접접합연구실용화그룹) ;
  • 고은수 ((주)이아이라이팅 기술연구소) ;
  • 최종현 ((주)이아이라이팅 기술연구소) ;
  • 문경식 (조지아텍 재료공학과) ;
  • 김목순 (인하대학교 신소재공학과) ;
  • 유세훈 (한국생산기술연구원 용접접합연구실용화그룹)
  • Received : 2014.08.13
  • Accepted : 2014.09.25
  • Published : 2014.09.30
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Abstract

$TiO_2$-nanoparticle-dispersed silicone was applied to a LED package and the light efficiency of the LED package was evaluated in this study. The addition of $TiO_2$ nanoparticles in silicone increased refractive index, which improved the light efficiency of the LED package. The $TiO_2$ nanoparticles were fabricated by hydrothermal synthesis and were dispsersed by a vinyl silane coating treatment. After the silane treatment, the $TiO_2$ nanoparticles dispersed with diameters of 10~40 nm but rod-shape $TiO_2$ nanoparticles with lengths of 100 nm were also observed. The refractive index increased with the $TiO_2$ concentration in silicone, while the transmittance decreased with the $TiO_2$ concentration. The light efficient of the LED package with $TiO_2$+silicone encapsulant was higher than that of the LED package with no $TiO_2$ in silicone encapsulant.

본 연구에서는 $TiO_2$ 나노입자를 LED패키지의 봉지재인 실리콘에 분산시키고, 이에 따른 굴절률, 투과율 및 광효율 변화를 평가하였다. $TiO_2$ 나노입자는 LED 봉지재의 굴절율을 증가시켜 LED 패키지의 광추출 효율을 향상시키기 위해 봉지재에 적용되었다. $TiO_2$는 수열합성법을 통해 합성되었고, 합성된 $TiO_2$ 입자에 긴 체인구조의 vinyl silane을 코팅하여 분산시켰다. 분산 처리를 실시한 후에는 대부분의 $TiO_2$ 나노입자가 10~40 nm 이하로 분산되었으나, 100 nm 이상의 긴 입자도 관찰되었다. 실리콘 봉지재에 $TiO_2$ 나노입자 양이 증가할수록 굴절율은 증가하였으나, 투과율은 감소하였다. $TiO_2$ 나노입자가 포함된 실리콘 봉지재로 LED 패키지를 제조하였고, $TiO_2$ 나노입자가 분산된 LED가 $TiO_2$ 나노입자가 없는 LED패키지에 비해 약 13% 이상 광효율이 향상되었다.

Keywords

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