ZnO Nanoparticles in Bettering The Color Uniformity of Phosphor-Converted White Led Lights

Abstract

To make further improvements in future WLED generation, bettering color uniformity is an important goal manufacturers desire to accomplish. One of the most common and effective methods to enhance the color homogeneity is the one focusing on improving scattering in phosphor layer which can be achieved by adding ZnO into the phosphor layer. Based on theoretical application of Mie-scattering, we compute and analyze the scattering characteristics of the diffusor particles. From the results, the ZnO particles are proven to have positive influences on the development of lighting quality. Additionally, the article analyzed and presented the effects of ZnO concentration which fluctuates from 2% to 22% on the color homogeneity. Thus, the color uniformity is influenced not only by the particle size but also by the concentration of the added ZnO. Hence, managing the color uniformity of WLEDs means controlling the size and concentration of ZnO. With the concentration of 10% ZnO, the lumen output of LEDs reaches the highest values. Meanwhile, when the concentration and size of ZnO are 14% and 500 nm respectively, ∆CCT is reduced to the lowest value. Based on the manufacturers' requirements, the most appropriate ZnO concentration and particle size can be determined. However, if requirements include both lumen and color uniformity, the right choice is 14% concentration with 500 nm particle size of ZnO.

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