Effect of site occupancy on the reduction of Eu3+ and tunable luminescence of CaLa4Si3O13:Eu phosphor. Issue 19 (1st October 2022)

• Record Type: Journal Article
• Authors: Chen, Wanping
• Is Part Of: Ceramics international. Volume 48:Issue 19(2022)Part A
• Page Start: 27456
• Page End: 27461
• Publication Date: 2022-10-01
• Subjects: Photoluminescence -- Phosphors -- Site occupancy -- Tunable luminescence; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.036
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of europium-ion doped CaLa4 Si3 O13 phosphors were synthesized by using a conventional high-temperature solid-state method. X-ray powder diffraction patterns and photoluminescence spectra were utilized to characterize the as-prepared phosphors. The phosphors show tunable luminescence owing to the existence of Eu 2+ and Eu 3+ emission. A typical emission maximum of Eu 2+ is about 460 nm, and Eu 3+ shows a predominant 5 D0 - 7 F2 transition emission. The emission of Eu 2+ shifts toward the long wavelength side with increasing doping concentration. The site occupancy of Eu 2+ and Eu 3+ is analyzed according to their luminescence behaviors. The Eu 3+ ion at the Ca 2+ site can be partially reduced to Eu 2+, but at the La 3+ site cannot be reduced. The controllable reducing of Eu 3+ is explained according to the crystal structure of the host. Utilizing site selection to control the reducing of Eu 3+ is considered as an alternative strategy to design novel Eu 3+ and Eu 2+ codoped inorganic phosphor.