Luminescence properties and energy transfer study of color temperature tunable CaSrSiO4:Dy3+,Eu3+ white phosphors

• Published in: Optical materials 2024-03, Vol.149, p.115033, Article 115033
• Main Authors: Hong, Junhuang, Liu, Yue, Xu, Yingchao, Meng, Xianguo, Fan, Haoshuang, Li, Jing, Lin, Zhenpeng
• Format: Article
• Language: English
• Subjects: CaSrSiO4; Energy transfer; Luminescence properties; Thermal stability; Tunable color temperature
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2024.115033

A series of CaSrSiO4:xDy3+,yEu3+ white phosphors were successfully synthesized by high-temperature solid-phase reaction technique. The physical phase, optical performance, energy transfer mechanism and thermal stability of the samples were studied. It has been shown that the concentration quenching point of CaSrSiO4:xDy3+ phosphors is x = 0.05 at the excitation of 365 nm. In CaSrSiO4:0.05Dy3+,yEu3+ phosphors, the emission intensity of Dy3+ gradually decreases with the increase of Eu3+ doping concentration. While the emission intensity of Eu3+ first increases and then decreases, the concentration quenching point of Eu3+ is y = 0.08. The analysis of the lifetime decay curves demonstrates the existence of an energy transfer process from Dy3+ to Eu3+ in CaSrSiO4:Dy3+,Eu3+ phosphors. The energy transfer from Dy3+ to Eu3+ is dominated by dipole-dipole interactions, with the highest energy transfer efficiency of 63.1 %. By adjusting the doping concentration of Eu3+, the doping of Eu3+ not only effectively improves the stability of phosphor, but also enables tunable color temperature from cold white light to neutral white light, which is a potentially promising white light emitting material. •Successfully synthesized a series of CaSrSiO4:xDy3+,yEu3+ (x = 0.05–0.125, y = 0.005–0.14) white phosphors by high-temperature solid-state reaction technique.•The samples luminescence intensity at 453 K can still be maintained at 90.2 % of the room temperature.•By adjusting the doping ratio of Dy3+/Eu3+, the color temperature can be adjusted from cold white light to neutral white light.