Optimization of tellurite glass system toward enhanced luminescence of phosphor solids for white LEDs

Abstract White light-emitting diodes (LEDs), as a fourth-generation green lighting source, have been widely used in various fields. At present, most white LEDs have based on a mixture of silicone with poor heat resistance and phosphors as luminescent components, which prevent them from adapting to high-temperature environments and limit their applications of high-power lighting. To improve the optical properties and reliability of white LEDs, phosphor solid is proposed as a new alternative, which not only has the strong stability of glass, but also completely retains the luminescent properties of phosphor. Therefore, in this study, tellurite glass was used as the matrix of phosphor solids to improve the luminescence performance by optimizing the composition of the matrix glass. In addition, rare earth ions were introduced into the tellurium glass matrix, and the dissolution ability of the matrix to rare earth ions was explored to improve the luminous quality of white LEDs.