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http://dx.doi.org/10.3807/KJOP.2014.25.5.254

Effect of Temperature on the Luminous Properties of Remote-Phosphor White Light-Emitting Diodes  

Choi, Min-Hyouk (Department of Physics, Hallym University)
Lee, Hun Jae (Department of Physics, Hallym University)
Ko, Jae-Hyeon (Department of Physics, Hallym University)
Publication Information
Korean Journal of Optics and Photonics / v.25, no.5, 2014 , pp. 254-261 More about this Journal
Abstract
Two types of white light-emitting diodes (LEDs) with different phosphor structures were fabricated and compared in terms of their optical characteristics. Their spectroscopic properties were analyzed as a function of temperature, from room temperature to $80^{\circ}C$. The temperature dependence of the luminance and the color coordinates showed that the decrease in luminance and change in the color coordinates of the remote-phosphor type LED were much smaller compared to the conventional white LED. These improvements were attributed to the decrease in phosphor temperature, due to the distance between the LED chip and the phosphor layer, as well as to the reduced absorption by the LED chip of the light emitted from the phosphor layer.
Keywords
White LED; Remote phosphor; Luminous characteristics; Temperature stability;
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Times Cited By KSCI : 5  (Citation Analysis)
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