Object-oriented emission-adaptive phosphor layer for pc-white LED

Kwang-Cheol Lee; Deokgi Kim; So-Ra Gang; Jong Hyeob Baek

doi:10.1117/12.2024866

30 September 2013 Object-oriented emission-adaptive phosphor layer for pc-white LED

Kwang-Cheol Lee, Deokgi Kim, So-Ra Gang, Jong Hyeob Baek

Proceedings Volume 8835, LED-based Illumination Systems; 88350K (2013) https://doi.org/10.1117/12.2024866
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The emission-adaptive phosphor layer was fabricated by self-exposure method to realize the pc-white LED. The effect of phosphor layer forming parameters such as phosphor content, exposure intensity and exposure time on the phosphor layer shape and LED characteristics was investigated. Through the fabrication process of phosphor layer, two types of phosphor layer shape were fabricated by phosphor layer forming parameters. In the case of low exposure intensity and/or short exposure time with high phosphor content, the conformal coating shape phosphor layer which is imitative of the irradiance pattern of an LED chip was formed, whereas in the high exposure intensity and/or long exposure time with low phosphor content, the light distribution proportional shape phosphor layer which reflects the near-filed pattern of an LED chip was formed. Therefore the latter was superior to the former in the angular color homogeneity due to a strong similarity between the phosphor content distribution and the light intensity distribution of an LED chip in all directions. It was concluded that the object-oriented emission-adaptive phosphor layer closely similar to the light distribution proportional shape phosphor layer was formed in the condition of high exposure intensity and/or long exposure time with high phosphor content and resulted in high luminous efficacy, low correlated color temperature as well as high angular color homogeneity.

Citation Download Citation

Kwang-Cheol Lee, Deokgi Kim, So-Ra Gang, and Jong Hyeob Baek "Object-oriented emission-adaptive phosphor layer for pc-white LED", Proc. SPIE 8835, LED-based Illumination Systems, 88350K (30 September 2013); https://doi.org/10.1117/12.2024866

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