MGa2B2O7:Bi3+,Al3+ (M = Sr, Ba) blue phosphors with a quantum yield of 99% and negative thermal quenching

The quantum yields of non-rare-earth blue phosphors SrGa 2 B 2 O 7 :Bi 3+ ,Al 3+ and BaGa 2 B 2 O 7 :Bi 3+ ,Al 3+ reach record high values of 96% and 99%, respectively. The SrGa 2 B 2 O 7 :Bi 3+ ,Al 3+ phosphor exhibits negative thermal quenching.