Issue 42, 2023

White-emitting orthosilicate phosphor α-Sr2SiO4:Ce3+/Eu2+/K+: a bimodal temperature sensor with excellent optical thermometric sensitivity

Abstract

Non-contact temperature sensors with low cost, high reliability and high sensitivity have attracted increasing research interest in recent years. In this study, we synthesized a bimodal optical temperature sensor Sr2SiO4:Ce3+/Eu2+/K+ with excellent thermometric sensitivity through a high-temperature solid-state reaction method. In the matrix of α-Sr2SiO4, Ce3+ luminescence exhibits excellent thermal stability (∼129.1%@250 °C), while Eu2+ shows strong thermal quenching (∼21.7%@250 °C), leading to a significant change in the fluorescence intensity ratio (FIR) of Ce3+ (437 nm) and Eu2+ (550 nm) as a function of temperature. This feature enables the phosphor exhibiting outstanding sensitivity in the temperature range of 298–523 K. To be exact, it demonstrates a maximal relative sensitivity of 0.93% K−1 at 348 K. Its absolute sensitivity linearly increases and reaches 3.46% K−1 at 523 K. Besides, it has a large chromaticity shift (ΔE = 228 × 10−3 in 298–523 K) against temperature, making the temperature change visible to the naked eye. We first demonstrate a CIE chromaticity coordinate technique for temperature sensing with high accuracy and good sensitivity by using the function of x or (x2 + y2)0.5 against T. These unique optical thermometric features allow Sr2SiO4:Ce3+/Eu2+/K+ to serve as an accurate and reliable thermometer probe candidate for temperature sensing applications.

Graphical abstract: White-emitting orthosilicate phosphor α-Sr2SiO4:Ce3+/Eu2+/K+: a bimodal temperature sensor with excellent optical thermometric sensitivity

Supplementary files

Article information

Article type
Paper
Submitted
01 jun 2023
Accepted
18 jul 2023
First published
01 aug 2023

Dalton Trans., 2023,52, 15475-15483

White-emitting orthosilicate phosphor α-Sr2SiO4:Ce3+/Eu2+/K+: a bimodal temperature sensor with excellent optical thermometric sensitivity

B. Hui, K. Zhao, H. Si, X. Tong, X. Wu, L. Yin and S. Huang, Dalton Trans., 2023, 52, 15475 DOI: 10.1039/D3DT01689G

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