Ba0.75Al11O17.25:Cr3+ red-emitting ceramic phosphor with luminescence thermal stability

Cr3+ doped Ba0.75Al11O17.25 red luminescent phosphors were synthesized and densified into ceramics by spark plasma sintering. Under the 405 nm excitation, the phosphors present a narrow band emission peaked at 704 nm and the highest emission intensity when the doping concentration of Cr3+ is 3%. When the temperature reaches 205 °C, the integrated emission intensity of the red emission can still reach 88% of the counterpart at room temperature, showing good luminescence thermal stability. The thermal conductivity of the ceramics is 4.87 W/(m·K) at room temperature, which is good for heat release under high power/high brightness excitations.