Issue 64, 2017, Issue in Progress
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RSC Advances

Upconversion luminescence and temperature-sensing properties of Ho3+/Yb3+-codoped ZnWO4 phosphors based on fluorescence intensity ratios

Xiaona Chai, ORCID logo a   Jun Li,a   Xusheng Wang,*a   Yanxia Lia  and  Xi Yaoa  

* Corresponding authors

a Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University, 4800 Cao'an Road, Shanghai 201804, China
E-mail: xs-wang@tongji.edu.cn

Abstract

Ho3+/Yb3+-codoped ZnWO4 phosphors were synthesized using a solid state reaction method and their structures, upconversion (UC) luminescence, and temperature-sensing properties were investigated. The obtained ZnWO4:0.01Ho3+/xYb3+ phosphors crystallized in the monoclinic phase with space group P2/c. Under 980 nm excitation, bright green [(5F4, 5S2) → 5I8], weak red (5F5 → 5I8), and near-infrared emissions [(5F4, 5S2) → 5I7] were observed. The optimal Ho3+ and Yb3+ doping concentrations in ZnWO4 were 0.01 and 0.15, respectively. The near-infrared-green (I757/I540) and red-green (I641,665/I540,549) fluorescence intensity ratios (FIRs) were studied as a function of temperature at 83–503 K. The sensitivity of the ZnWO4:0.01Ho3+/0.15Yb3+ phosphors was also discussed and their potential application as thermal sensors in luminescence thermometry was analyzed using a four-level system and the intensity ratio of the red and green emissions. ZnWO4:0.01Ho3+/0.15Yb3+ phosphors could potentially be applied as optical temperature-sensing materials.

Graphical abstract: Upconversion luminescence and temperature-sensing properties of Ho3+/Yb3+-codoped ZnWO4 phosphors based on fluorescence intensity ratios

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Article information

DOI
https://doi.org/10.1039/C7RA05846B
Article type
Paper
Submitted
24 May 2017
Accepted
24 Jul 2017
First published
16 Aug 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 40046-40052

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Upconversion luminescence and temperature-sensing properties of Ho3+/Yb3+-codoped ZnWO4 phosphors based on fluorescence intensity ratios

X. Chai, J. Li, X. Wang, Y. Li and X. Yao, RSC Adv., 2017, 7, 40046 DOI: 10.1039/C7RA05846B

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