Dual-Mode Optical Thermometry Design in Lu3Al5O12:Ce3+/Mn4+ Phosphor

Yibo Chen; Jin He; Xinguo Zhang; Mingcong Rong; Zhiguo Xia; Jing Wang; Zhao-Qing Liu

doi:10.1021/acs.inorgchem.9b03107

Dual-Mode Optical Thermometry Design in Lu₃Al₅O₁₂:Ce³⁺/Mn⁴⁺ Phosphor

Inorg Chem. 2020 Jan 21;59(2):1383-1392. doi: 10.1021/acs.inorgchem.9b03107. Epub 2020 Jan 9.

Authors

Yibo Chen¹, Jin He¹, Xinguo Zhang², Mingcong Rong¹, Zhiguo Xia³, Jing Wang⁴, Zhao-Qing Liu¹

Affiliations

¹ School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Clean Energy and Materials , Guangzhou University , Guangzhou 510006 , China.
² Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences , Southern Medical University , Guangzhou 510515 , China.
³ State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials , South China University of Technology , Guangzhou 510641 , China.
⁴ Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, School of Materials Science and Engineering , Sun Yat-Sen University , Guangzhou 510275 , China.

PMID: 31916435
DOI: 10.1021/acs.inorgchem.9b03107

Abstract

There is a challenge for noncontact temperature-sensing techniques and the related materials, in which a highly reliable contactless thermometer probe with low cost and high sensitivity is in demand. Here, the Lu₃Al₅O₁₂:Ce³⁺/Mn⁴⁺ phosphor has been designed and prepared for the high-performance fluorescence temperature-sensing application in a novel one-pot, self-redox, solid-state process. Benefiting from the different electron-lattice/phonon interactions of Ce³⁺ and Mn⁴⁺, two distinguishable emission peaks with significantly different temperature responses originating from Ce³⁺ and Mn⁴⁺ are realized. Applying the fluorescence intensity ratio of Mn⁴⁺ versus Ce³⁺ and the decay lifetime of Mn⁴⁺ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 100-350 K. The maximum relative sensitivities (S_r) are derived as 4.37 and 3.22% K^-1 respectively, as well as a large chromaticity shift visible to naked eyes (ΔE = 153 × 10^-3 in 100-350 K) is observed. This is the first report of a Ce³⁺,Mn⁴⁺ co-doped dual-emitting phosphor, and its unique optical thermometric features demonstrate the high potential of Lu₃Al₅O₁₂:Ce³⁺/Mn⁴⁺ as an accurate and reliable thermometer probe candidate.