Enhanced luminescence efficiency and thermal stability via introduction of non-rare earth Bi3+ in Gd5Si2BO13:Eu3+

A series of Gd₅Si₂BO₁₃:Eu³⁺ and non-rare earth Bi³⁺ ions doped Gd₅Si₂BO₁₃:Eu³⁺ phosphors was successfully synthesized via high-temperature solid-state method,and the as-obtained phosphors were studied on their phase structures,luminescence characteristics,thermal stability and luminescence lifetime.Transient fluorescence spectroscopy data show that the addition of Bi³⁺ can obviously enha...

Enhanced luminescence efficiency and thermal stability via introduction of non-rare earth Bi3+ in Gd5Si2BO13:Eu3+

A series of Gd₅Si₂BO₁₃:Eu³⁺ and non-rare earth Bi³⁺ ions doped Gd₅Si₂BO₁₃:Eu³⁺ phosphors was successfully synthesized via high-temperature solid-state method, and the as-obtained phosphors were studied on their phase structures, luminescence characteristics, thermal stability and luminescence lifetime. Transient fluorescence spectroscopy data show that the addition of Bi³⁺ can obviously enhance the emission intensity of Eu³⁺ in the near-ultraviolet band owing to energy transfer from Bi³⁺ to Eu³⁺. Besides, the addition of Bi³⁺ can improve the thermal stability of a single-doped phosphor Gd₅Si₂BO₁₃:0.35Eu³⁺ from 70.33% to 87.45% at 150 °C and the quantum yield from 58.80% to 78.61% at room temperature. Finally, Gd₅Si₂BO₁₃:Eu³⁺,Bi³⁺ was used to encapsulate white light-emitting diodes (WLEDs) with green ((Ba,Sr)₂SiO₄:Eu²⁺) and blue (BaMgAl₁₀O₁₇:Eu²⁺) commercial phosphors. The color rendering index of WLEDs was calculated to be larger than 90, and the color temperature was estimated to be 4300–4500 K, which demonstrate that Gd₅Si₂BO₁₃:Eu³⁺,Bi³⁺ can be regarded as a red phosphor with great potential application. This paper can provide a new insight into design of high-efficiency phosphors by introducing non-rare earth Bi³⁺ ions via energy transfer from Bi³⁺ to Eu³⁺.