Single-phase white-emitting phosphors Ba3Bi(PO4)3:Dy3+, Eu3+ with tunable correlated color temperature and high thermal stability towards light emitting applications

A series of single-phase white-emitting phosphors Ba3Bi(PO4)(3) (BBP):8 at.% Dy, x at.% Eu were successfully synthesized through high temperature solid-phase method. The luminescence properties of BBP:8 at.% Dy, x at.% Eu were systematically investigated. Experimental results indicate the doping of Eu3+ ions can effectively compensate the red light component in the emission spectrum and tune the correlated color temperature of BBP:8 at.% Dy, x at.% Eu from cool white light (5097 K) to warm white light (3661 K). Moreover, BBP:8 at.% Dy3+, 0.8 at.% Eu3+ phosphor exhibits excellent thermal stability and the fluorescence intensity at 150 degrees C can still maintain 76% of that at 25 degrees C, while the activation energy is determined to be similar to 0.23 eV. In addition, the quantum efficiency of BBP:8 at.% Dy3+, 0.8 at.% Eu3+ phosphor were measured to be 61%. These results suggest that BBP:8 at.% Dy3+, 0.8 at.% Eu3+ can be a NUV-pumped single-phase white phosphors with excellent comprehensive performances.