Luminescence properties of LaPO4:RE (RE = Dy3+, Eu3+, Sm3+) orthophosphate phosphor for n-UV solid-state lighting prepared by wet chemical synthesis

The synthesis of LaPO4:RE (RE = Dy3+, Eu3+, Sm3+) via a wet chemical method was reported. The prepared phosphor was characterized by XRD, and photoluminescence characteristics were reported. A monoclinic phase was confirmed by X-ray diffraction measurements. Under UV excitation (349 nm), LaPO4:Dy3+ phosphor shows emission at 481 and 575 nm, corresponding to a magnetic dipole (F-4(9/2) -> H-6(15/2) ) and electric dipole (F-4(9/2) -> H-6(13/2)) transitions. When LaPO4:Eu3+ phosphor was stimulated at 394 nm, observed emission spectra exhibited prominent bands at 593 and 615 nm, corresponding to magnetic dipole D-5(0) -> F-7(1) transition with the maximum intensity of emission and electric dipole D-5(0) -> F-7(2) transition, respectively. When excited at a wavelength of 402 nm, the LaPO4:Sm3+ phosphor shows emission at 562 nm and 597 nm, which correspond to the (4)G(5/2)-> H-6(5/2) and (4)G(5/2)-> H-6(7/2) transitions. The photoluminescence studies show that the LaPO4:RE (RE = Dy3+, Eu3+ and Sm3+) phosphors could be applicable in the fields of n-UV-excited solid-state lighting.

Automated summary

The synthesis of LaPO4:RE (RE = Dy3+, Eu3+, Sm3+) phosphors via a wet chemical method was reported. XRD characterization and photoluminescence studies were conducted. Different transitions were observed for each RE-doped phosphor under UV or visible light excitation. The results suggest their potential applications in n-UV-excited solid-state lighting.