Preparation and Properties of Low Melting Point Sn-P-F-O-Matrix Phosphor-in-Glass for white LED

The Phosphor-in-Glass(PIG) for white LED has the characteristics of high physicochemical stability, good heat dissipation and excellent performance, which can effectively avoid the problems of low luminous efficiency, poor heat dissipation and color coordinate shift caused by organic resin cracking, yellowing and phosphor degradation in traditional white LED packaging. In order to prepare PIG with even better properties, the low melting point PIG samples were prepared by melting sintering of Sn-P-F-0 glass matrixs and red
$\mathbf{CaAlSiN}_{3}: \mathbf{E u}^{2+}$
and green
$(\mathbf{BaSr})_{2} \mathbf{SiO}_{4}: \mathbf{E u}^{2+}$
phosphors. The properties of low melting point PIG were analyzed by PL, XRD, SEM, EDS and LED photoelectric test system. The results show that the phosphor is regularly embedded in the precursor glass, the phosphor morphology is not damaged, and the luminescence characteristics of different phosphors are effectively protected as Sn-P-F-O matrix has low melting point. At the same time, by changing the content of different phosphors and the thickness of the glass, the luminescent performance of the PIG can be flexibly adjusted, and the white LED shows adjustable chromaticity. Finally, the packaged light emitting diodes were obtained approprite CCT of 3000–6000 K and good CRI of 89–91.