Optimizing Luminescence Intensity and Thermal Stability of Gd5Si2BO13:Tb3+ Through the Incorporation of Non-Rare Earth Bi3+

Rare earth ion doped fluorescent powder, as a key material for the application of white light-emitting diodes (w-LEDs), green components often face the problem of poor thermal stability. Developing fluorescent powders with excellent thermal stability is of great significance. This article synthesized a series of Gd5Si2BO13:Tb3+ blue phosphors and non rare earth Bi3+ ion doped Gd5Si2BO13:Tb3+ green phosphors using a high-temperature solid-phase method. The phase structure and photoluminescence characteristics of the sample were analyzed in detail through XRD, excitation and emission spectra, as well as attenuation curves. The energy transfer from Bi3+ to Tb3+ was studied and confirmed through photoluminescence spectra and lifetime decay curves. Research has shown that the addition of Bi3+ significantly enhances the emission intensity of Tb3+ in the near ultraviolet range, and tunes the emission color of Gd5Si2BO13:Bi3+ and Tb3+ from blue to green, attributed to the energy transfer from Bi3+ to Tb3+. In addition, the addition of Bi3+ increased the thermal stability of single doped fluorescent powder Gd5Si2BO13:0.55Tb(3+) from 88.21 % to 92.82 % at 150 degree celsius, proving that the Gd5Si2BO13:Bi3+ and Tb3+ samples have good thermal stability. This study not only deepens our understanding of the new main material Gd5Si2BO13, but also provides a reference for the development of green phosphors with excellent thermal stability.