Tunable luminescence of SrBa(PO)Cl:Eu (0 ≤ x ≤ 100%) phosphors from different Eu centers.

Yu, Hualing; Zhang, Jia; Zhai, Zhangyin

In this paper, a series of Eu activated SrBa(PO)Cl (0 ≤ x ≤ 100%) phosphors were prepared by solid-state reaction method, and their luminescence properties under near-ultraviolet excitation were investigated. For Eu-activated Sr(PO)Cl, a strong emission band located at 445 nm is observed upon 365 nm excitation, which could be attributed to the 4 f 5 d -4 f transition of different Eu centers. When the Ba is introduced into the Sr(PO)Cl:Eu, the emission band of Eu is broadened largely. The fluorescence lifetimes for different Eu centers were determined by the decay curves and time-resolved spectra. The excitation spectra of the as-prepared samples cover a wide wavelength range from 240 to 420 nm, which can well match the emission wavelength of the near ultraviolet LED chip. The investigation of the thermal luminescence stability reveals that the introduction of Ba could improve the thermal quenching properties.

PHOSPHORS; STRONTIUM chloride; BARIUM chloride; LUMINESCENCE; EXCITATION spectrum; METAL quenching; EUROPIUM

Journal of Materials Science: Materials in Electronics, 2017, Vol 28, Issue 19, p14149

0957-4522

Academic Journal

10.1007/s10854-017-7268-9