Magnetic tuning in upconversion emission enhanced through Ag+ ions co-doped in GdF3 : Ho3+ /Yb3+ phosphor and a real-time temperature sensing demonstration

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Kumar, A (Author) Other; Tiwari, SP (Author) Other; Kumar, K (Author) Other; Joaquim C G E Esteves da Silva (Author) FCUP

Journal

Title: Journal of Alloys and Compounds

Vol. 776

Pages: 207-214

ISSN: 0925-8388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 20 Citations

Scopus - 22 Citations

Other information

Authenticus ID: P-00P-TZ1

DOI: 10.1016/j.jallcom.2018.10.156

Abstract (EN): Herein Ho3+/Yb3+ doped GdF3 phosphor was prepared by chemical coprecipitation method. Further, during sample preparation, Ag+ ions were incorporated into the GdF3 lattice to enhance the upconversion emission. Using 980 nm excitation intense emission bands were observed at 543 nm and 650 nm corresponding to the E-5(4) -> I-5(8) and F-5(5) -> I-5(8) transitions. Incorporation of Ag+ ions has resulted in enhancement in the emission and maximum intensity was obtained for the Ag+ concentration of 10 mol %. It was supposed that Ag+ ions change the crystal field around the Ho3+ ions that result in emission enhancement. The Ag+ incorporation was also confirmed through UV-vis absorption and down-conversion analysis. The effect of the magnetic field was studied on the emission intensity and an optical hysteresis loop was observed in the plot of emission intensity vs the magnetic field. The CIE color coordinate variation based temperature sensing ability of the optimized sample is also demonstrated. (C) 2018 Published by Elsevier B.V.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8