Effects of the surface area of phosphor powders on colour coordinate variance

In this study, the colour coordinate behaviours according to the surface area of phosphors were investigated to implement the colour coordinate of the desired zone in a random colour coordinate. For this purpose, the mixing ratio and dispensing amount of a green phosphor (Ce:YAG) and three red phosphors (CaAlSiN₃:Eu²⁺) with different specific surface areas were adjusted, and the corresponding colour coordinate behaviour was examined. As a result, the colour coordinate behaviour was found to be considerably influenced by the mixing ratio of red and green phosphors and the surface area of the phosphor powder particles. In conclusion, the colour coordinate of the desired zone can be more efficiently implemented by predicting the characteristics of different types of phosphors and their colour coordinate behaviours. The findings of this study are expected to greatly increase the yield of the light-emitting diode industry.