The effect of temperature on the color temperature of GaN-based LED

In this paper, two kinds of GaN-based light emitting diodes (LED) with difference in color temperature were tested under the temperature range from 283K to 353K and current of 350mA.The samples were fabricated with the same blue-ray chip but coated by different yttrium aluminum garnet (YAG) phosphor. After analyzing the PL spectrum, the result shows that the color temperature of LED increases while temperature raising, what´s more, the cool-color-temperature LED increases more. It also proves that the color temperature of GaN-based write LED has relation to the proportion of blue ray radiant flux.