Spectrally tunable near-infrared photoluminescence in MP 3 O 9 :Cr 3+ (M = Al, Ga, In) phosphate phosphors

A highly thermally stable phosphate system was reported and a wide range of spectral tuning (787–894 nm) was achieved by varying the M ion in the MP 3 O 9 :Cr 3+ (M = Al, Ga, In) family.