A near-ultraviolet (NUV) converting green-yellow Ca2AlMg0.5Si1.5O7:Eu2+ phosphor for white light-emitting-diodes (w-LEDs)

• A new novel near-ultraviolet converting green-yellow phosphor has been developed.
• The as prepared phosphor can absorb NUV light (350–500 nm) effectively and emit bright green-yellow light.
• It is found that the emission spectra of the phosphors can be tune via changing the concentration of doped rare earth ions.

Eu2+ doped aluminosilicate phosphors (Ca2AlMg0.5Si1.5O7:Eu2+ (CAMS:Eu2+)) for white near-UV w-LEDs have been synthesized by solid-state reaction at 1250 °C. The phase and crystal structure of CAMS have been analyzed by using XRD. The material with a relatively low Eu2+ concentration displayed a peak in excitation spectrum at 372 nm and a tunable emission spectrum. The colorimetric coordinate of sample with optimum Eu2+ concentration locates in green-yellow region with coordinate value of (0.2639, 0.6212). When the phosphor was pumped by UV light (λ ≈ 372 nm), we obtained bright green-yellow light, suggesting this material has a potential application as a NUV converting green-yellow phosphor for the NUV w-LEDs.