화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.20, No.2, 97-102, June, 2014
Export Citation
고효율 백색 발광다이오드 구현을 위한 고점도 형광체 정량 토출 공정 연구
A Study on High Viscosity Phosphor Dispensing Process for Implementation of High-Efficiency White LED
양영진, 김형찬1, 고정범1, 양봉수1, 당현우1, 도양회1, †, 조경호†, 최경현
  • 제주대학교 메카트로닉스공학과, 690-756 제주특별자치도 제주시 제주대학로 102
  • 1제주대학교 전자공학과, 690-756 제주특별자치도 제주시 제주대학로 102
Young-Jin Yang, Hyung-Chan Kim1, Jeong-Beom Ko1, Bong-Su Yang1, Hyun-Woo Dang1, Yang-Hoi Doh1, †, †, and Kyung-Hyun Choi
  • Department of Mechatronics Engineering, Jeju National University, 102 Jejudaehak-ro, Jeju-si, Jeju-do 690-756, Korea
  • 1Department of Electronic Engineering, Jeju National University, 102 Jejudaehak-ro, Jeju-si, Jeju-do 690-756, Korea
E-mail:,
초록
현재 고효율 백색 발광다이오드(light emitting diode, LED) 구현을 위한 고점도 형광체 토출에 대한 많은 연구가 진행 중이다. 백색 발광다이오드에서 제품성능에 영향을 미칠 수 있어 고점도 형광체의 정량토출은 중요하다. 그러나 기존 연구에서 고점도 형광체 정량토출의 어려움이 있었다. 고점도 형광체의 정량토출을 위해서 본 연구에서는 다양한 점도에서 미세토출이 가능한 정전기력 프린팅 기술을 적용하였다. 전압 변화에 따른 요구 적출형(drop on demand, DOD) 토출 실험을 진행하여 토출 시 노즐의 메니스커스 각도와 토출 도트 직경 사이의 상관관계를 도출하였다. 토출 전압이 증가함에 따라, 토출 메 니스커스 각도는 증가하고 토출 도트 직경은 감소하였다.
Currently various studies are underway for dispensing high-viscosity phosphor. These studies have reported limitations and challenges in the dispensing process. The discharged amount of phosphor was approximately the same each time which is important for the implementation of high-efficiency white LED technology. This paper present high-viscosity phosphor dispensing process for white LED implementation by using electrostatic printing technology. The voltage controlled DOD (Drop-On-Demand) discharge experiment was studied to determine angle of drop meniscus at nozzle and dot diameter. With increase in Discharge voltage, the discharge angle of meniscus increased while dot diameter decreased. Therefore it can be concluded that we can control the discharge rate by controling the discharge angle of meniscus.
Keywords:High-viscosity resin;Light emitting diode (LED) phosphor;Electrohydrodynamics (EHD);Drop on demand (DOD)
  1. Park SC, “Luminous Efficiency of Phosphor-Converted White Light-Emitting Diodes,” Physics, Doctor Philosophy in Science, Kyungpook National University (2012)
  2. Ha SJ, Kim JS, Cho MW, Choi JM, J. Korea Academia-Ind. Cooperation Soc., 14(5), 2113 (2013)
  3. Kim SH, “Screw Pump for Dispensing LED Phosphor Wear Characteristic,” Mechanical Engineering, Master of Science, Inha University (2011)
  4. Jaworek A, Krupa A, J. Aerosol Sci., 30(7), 873 (1999)
  5. Kang DK, “Experimental Study on Solar Cell Electrode via Electrohydrodynamic (EHD) Inkjet Printing,” Mechanical Engineering, Master of Science, Korea University (2011)
  6. Rahman A, Ali A, Rahman K, Kim HC, Doh YH, Kim DS, Choi KH, Jpn J. Appl. Phys., 49 (2010)
  7. Yang YJ, Ko JB, Dang HW, Kim HC, Choi KH, Cho KH, J. KSPE, 29, 455 (2012)
  8. Ko JB, “Development of Electrostatic Inkjet Head for Printed Electronics,” Major of Electronic Engineering, Master of Science, Jeju National University (2010)
  9. Gana-Calvo AM, Phys. Rev. Lett., 29(2), 217 (1997)
  10. Gana-Calvo AM, Barrero A, J. Aerosol Sci., 27, 179 (1996)
  11. Tran SB, Byun DY, Nguyen VD, Kang TS, Phys. Rev. E, 80 (2009)
  12. Wu N, Pease LF, Russel WB, Adv. Funct. Mater., 16(15), 1992 (2006)
  13. Wu N, Russel WB, Nano Today, 4(2), 180 (2009)