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Microchimica Acta

, 185:197 | Cite as

Effect of silica surface coating on the luminescence lifetime and upconversion temperature sensing properties of semiconductor zinc oxide doped with gallium(III) and sensitized with rare earth ions Yb(III) and Tm(III)

  • Yuemei Li
  • Yongmei Li
  • Rui WangEmail author
  • Wei Zheng
Original Paper

Abstract

Optical sensing of temperature by measurement of the ratio of the intensities of the 700 nm emission and the 800 nm emission of Ga(III)-doped ZnO (GZO) nanoparticles (NPs) and of GZO NPs coated with a silica shell are demonstrated at 980 nm excitation. It is found that the relative sensitivity of SiO2@Yb/Tm/GZO is 6.2% K−1 at a temperature of 693 K. This is ~3.4 times higher than that of Yb/Tm/GZO NPs. Obviously, the SiO2 shell structure decreases the rate of the nonradiative decay. The decay time of the 800 nm emission of the Yb/Tm/GZO NPs (15 mol% Ga; 7 mol% Yb; 0.5 mol% Tm) displays a biexponential decay with a dominant decay time of 148 μs and a second decay time of ~412 μs. The lifetime of the Yb/Tm/GZO NPs at 293 K, and of the SiO2@Yb/Tm/GZO NPs are ~412 μs. Both the Yb/Tm/GZO and SiO2@Yb/Tm/GZO can be used up to 693 K. These results indicate that the SiO2 shell on the Yb/Tm/GZO is beneficial in terms of sensitivity and resolution.

Graphical abstract

The enhancement the decay time and thermal sensitivity in the SiO2@Yb/Tm/GZO shell@core structure have been studied compared to the Ga(III)-doped Yb/Tm-doped ZnO (Yb/Tm/GZO). The SiO2@Yb/Tm/GZO have good thermal accuracy up to 693 °C.

Keywords

Core@shell structure Upconversion luminescence Fluorescence lifetime Relative sensor sensitivity 

Notes

Compliance with ethical standards

The authors declare that they have no competing interests.

Supplementary material

604_2018_2733_MOESM1_ESM.docx (22 kb)
ESM 1 (DOCX 22 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.Key Laboratory of Hormones and Development (Ministry of Health), Tianjin Key Laboratory of Metabolic Diseases, Tianjin Metabolic Diseases Hospital & Tianjin Institute of EndocrinologyTianjin Medical UniversityTianjinChina

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