Journal of Korean Society of Industrial and Systems Engineering (산업경영시스템학회지)

Society of Korea Industrial and System Engineering (한국산업경영시스템학회)
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Development & Reliability Verification of Ultra-high Color Rendering White Artificial Sunlight LED Device using Deep Blue LED Light Source and Phosphor

Deep Blue LED 광원과 형광체를 이용한 초고연색 백색 인공태양광 LED 소자의 개발

  • Jong-Uk An (Department of Convergence Management of Technology, Jeonbuk National University) ;
  • Tae-Kyu Kwon (Department of Convergence Management of Technology, Jeonbuk National University)
  • 안종욱 (전북대학교 일반대학원 융합기술경영학과(MOT)) ;
  • 권대규 (전북대학교 일반대학원 융합기술경영학과(MOT))
  • Received : 2023.07.28
  • Accepted : 2023.08.25
  • Published : 2023.09.30
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Abstract

Currently, yellow phosphor of Y3Al5O12:Ce3+ (YAG:Ce) fluorescent material is applied to a 450~480nm blue LED light source to implement a white LED device and it has a simple structure, can obtain sufficient luminance, and is economical. However, in this method, in terms of spectrum analysis, it is difficult to mass-produce white LEDs having the same color coordinates due to color separation cause by the wide wavelength gap between blue and yellow band. There is a disadvantage that it is difficult to control optical properties such as color stability and color rendering. In addition, this method does not emit purple light in the range of 380 to 420nm, so it is white without purple color that can not implement the spectrum of the entire visible light spectrum as like sunlight. Because of this, it is difficult to implement a color rendering index(CRI) of 90 or higher, and natural light characteristics such as sunlight can not be expected. For this, need for a method of implementing sunlight with one LED by using a method of combining phosphors with one light source, rather than a method of combining red, blue, and yellow LEDs. Using this method, the characteristics of an artificial sunlight LED device with a spectrum similar to that of sunlight were demonstrated by implementing LED devices of various color temperatures with high color rendering by injecting phosphors into a 405nm deep blue LED light source. In order to find the spectrum closest to sunlight, different combinations of phosphors were repeatedly fabricated and tested. In addition, reliability and mass productivity were verified through temperature and humidity tests and ink penetration tests.

Keywords

Acknowledgement

This study has been supported by MOTIE funding program "Advanced Graduate Education for Management of Convergence Technology".

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