Ca4(PO4)2O:Eu2+, Eu3+ phosphor enabled sundry spectral range sub-K optical thermometry. (August 2023)

• Record Type: Journal Article
• Authors: Ogugua, S.N.; Erasmus, L.J.B.; Swart, H.C.
• Is Part Of: Materials research bulletin. Volume 164(2023)
• Publication Date: 2023-08
• Subjects: Optical thermometry -- Phosphor thermometry -- Spectral temperature sensing -- Temporal temperature sensing -- Sub-k temperature sensitivity; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2023.112256
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: Ca4 (PO4 )2 O:Eu 2 +, Eu 3 + phosphor demonstrated sub-K temperature sensitivity. This material allowed temperature sensitivity from LIR and lifetime methods. LIR method realized an average sensitivity of 1.76%/°C (20–60 °C). Lifetime method realized an average sensitivity of 1.96%/°C (20–60 °C). This material could have potential application in low-temperature thermal imaging. Abstract: Herein, we report on the luminescence and thermometric properties of Ca4 (PO4 )2 O:Eu. The photoluminescence emission exhibited blue and red bands from Eu 2+ and yellow and red lines from Eu 3+ . The multiple-emission features allowed a study of the thermometric properties in the different spectral ranges, namely, blue-green, yellow, red and near-infrared, using the luminescence intensity ratio method. The average temperature sensitivities of 1.76, 0.1, 0.11 and 0.11%/°C (in the temperature range of 30–60 °C) were obtained from the 425 to 525 nm, 560 to 580 nm, 615 to 635 nm, and 635 to 900 nm spectral ranges, respectively. The lifetime method produced high-temperature sensitivities of 1.96%/°C and 1.77%/°C in the 20–60 °C from the 700 to 455 nm bands, respectively. This suggests that this material could be applied in low-temperature thermal imaging applications such as thermal convection and biological processes. Graphical abstract: Image, graphical abstract