**5.1 Properties of some currently available color conversion phosphor**

Blue LD-based white light can be generated by using down-conversion phosphors. In this study, two phosphor types were studied as a potential replacement for blue LD-based high CRI lighting and high-speed VLC. These include cesium lead bromide quantum dot <sup>3</sup> (CsPbBr -QD) and potassium fluorosilicate (KSF). We fabricated a polymethyl methacrylate (PMMA) doped phosphor film consisting of CsPbBr3 -QD and KSF as a color converter. Additionally, we systematically studied the properties of generated white light from the fabricated composite phosphor film and commercially available phosphor coated on glass CL827-R45-XT. The basic introduction of these phosphors is presented below.


**Table 2.**

*Color conversion phosphor that can be excited by the blue or ultraviolet laser diode.*
