Upconversion luminescence of Sm 2+ ions

• Published in: RSC advances Vol. 7; no. 23; pp. 14010 - 14014
• Main Authors: Liu, Xiaohui, Aidilibike, Tuerxun, Guo, Junjie, Li, Yangyang, Di, Weihua, Qin, Weiping
• Format: Journal Article
• Language: English
• Published: 2017
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C7RA00071E

Herein, we report the phenomenon of upconversion luminescence from Sm 2+ ions, which demonstrates that changeable valence lanthanides can serve as ions for optical frequency transformation. Upon excitation with a 980 nm diode laser, the doped Sm 2+ ions in the hybrid material BaFCl 0.5 Br 0.5 :1%Sm 2+ –CaF 2 :1%Yb 3+ emit red upconversion fluorescence peaks at 631 nm, 644 nm, 665 nm, 689 nm, 704 nm, and 729 nm from the 5 D 0,1 → 7 F 0,1,2 transitions. By transient dynamic analysis, we attributed the excitation of Sm 2+ ions to the cooperation energy transfer process, in which two excited Yb 3+ ions simultaneously transfer their energy to one Sm 2+ ion.