SrGa₂B₂O₇: Bi³⁺, M⁺ (M = Li, Na, K), Novel Deep-Blue Phosphors with High Quantum Yields and Negative Thermal Quenching for High-Quality White LED

Luminescent materials with emissions at specific wavelengths, which have a relatively lower proportion of emissions in the solar spectrum, have great prospects for use in production and daily life. In this study, SrGaB2O7 deep-blue phosphors doped with Bi3+ are synthesized, it has 430 nm deep-blue emissions and a low proportion of emissions relative to 470-660 nm visible light in the solar spectrum. By co-doping with alkali metal ions to compensate for the charge, the emission intensities and absolute quantum yields of the phosphors can be effectively improved. The SrGaB2O7:0.01Bi(3+), 0.01K(+) deep-blue phosphor has a high quantum yield of 85% and negative thermal quenching properties. Moreover, the SrGaB2O7:0.01Bi(3+), 0.01K(+) deep-blue phosphor can be packaged with different potting adhesives to form light-emitting diodes (LEDs), exhibiting excellent luminescent performances and promising application prospects.