Luminescence properties of Ca{sub 0.65}La{sub 0.35}F{sub 2.35}:Yb{sup 3+}, Er{sup 3+} with enhanced red emission via upconversion
- School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China)
Graphical abstract: Under 980 nm excitation, Ca{sub 0.65}La{sub 0.35}F{sub 2.35}:20 mol.%Yb{sup 3+}, xEr{sup 3+} showed intense red upconversion luminescence, which was ascribed to {sup 4}F{sub 9/2} {yields} {sup 4}I{sub 15/2} transition of Er{sup 3+}. The ground-state absorption (GSA), excited-state absorption (ESA) and energy transfer (ET) processes between Er{sup 3+}/Yb{sup 3+} ions and Er{sup 3+}/Er{sup 3} ions were involved in the enhanced red emission mechanism. . Research highlights: {yields} Yb{sup 3+}/Er{sup 3+} codoped Ca{sub 0.65}La{sub 0.35}F{sub 2.35} materials with intense red emission via upconversion were prepared by a high temperature solid-state method. {yields} Ca{sub 0.65}La{sub 0.35}F{sub 2.35}:20 mol.%Yb{sup 3+}, xEr{sup 3+} showed intense red upconversion luminescence, which was ascribed to {sup 4}F{sub 9/2} {yields} {sup 4}I{sub 15/2} transition of Er{sup 3+}. {yields} The green and red emissions are two-photon processes, while both energy transfers between Yb{sup 3+}/Er{sup 3+} and Er{sup 3+}/Er{sup 3+} are involved in the red emission mechanism of the Ca{sub 0.65}La{sub 0.35}F{sub 2.35}:20 mol.%Yb{sup 3+}, xEr{sup 3+} materials. -- Abstract: Yb{sup 3+}/Er{sup 3+} codoped Ca{sub 0.65}La{sub 0.35}F{sub 2.35} materials with intense red emission via upconversion were prepared by a high temperature solid-state method. Based on the upconversion luminescence properties investigations, it was found that, under 980 nm excitation, Ca{sub 0.65}La{sub 0.35}F{sub 2.35}:20 mol.%Yb{sup 3+}, xEr{sup 3+} showed intense red upconversion luminescence, which was ascribed to {sup 4}F{sub 9/2} {yields} {sup 4}I{sub 15/2} transition of Er{sup 3+}, although both green and red emissions could be detected. It was also found that the green and red emissions originated the two photon processes, and the ground-state absorption (GSA), excited-state absorption (ESA) and energy transfer (ET) processes between Er{sup 3+}/Yb{sup 3+} ions and Er{sup 3+}/Er{sup 3} ions were involved in the enhanced red emission mechanism.
- OSTI ID:
- 22210037
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 46; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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