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

Abstract 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, SrGaB 2 O 7 deep‐blue phosphors doped with Bi 3+ 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 SrGaB 2 O 7 :0.01Bi 3+ , 0.01K + deep‐blue phosphor has a high quantum yield of 85% and negative thermal quenching properties. Moreover, the SrGaB 2 O 7 :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.