Combustion synthesis and spectroscopic investigation of CaNa2(SO4)2:Eu3+ phosphor

Abstract A series of CaNa2(SO4)2:xEu3+ (x = 0.1–2 mol%) phosphors were successfully prepared through the combustion method, and their photoluminescence properties were studied. The samples are well crystallized in the monoclinic phase. Photoluminescence (PL) excitation spectra of CaNa2(SO4)2:Eu3+ phosphors can be effectively excited by ultraviolet light (396 nm) and blue light (466 nm), which are well suitable for current commercial near-UV and blue LEDs. The emission spectrum exhibited two strong emission band around at 595 (orange region) and 618 nm (red region) corresponding to the magnetic dipole 5D0 → 7F1 and electric dipole 5D0 → 7F2 transition of Eu3+ ions, under 395 nm (7F0 → 5L6) excitation wavelength. The PL emission spectra revealed emission intensity increased with increasing Eu3+ concentration and then decreased. Concentration quenching occurs when the Eu3+ concentration and critical transfer distance of the phosphor are also calculated. The CIE chromaticity coordinate, Color purity, and color correlated temperature also calculated. These outcomes show that the CaNa2(SO4)2:Eu3+ phosphors are able to be applied to white light-emitting diodes as a red component.