Splendid four-mode optical thermometry design based on thermochromic Cs3GdGe3O9:Er3+ phosphors

Wei, Rongfei; Lu, Fumin; Wang, Li; Hu, Fangfang; Tian, Xiangling; Guo, Hai

doi:10.1039/d2tc01812h

Cited by 53 publications

(18 citation statements)

References 53 publications

(107 reference statements)

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“…27 Moreover, Guo et al demonstrated that CGG host UCL phosphors have a good application in temperature sensing. 28,29 Based on the above studies, we believe that CGG host has the characteristics of drastically changing the Er 3+ -Yb 3+ distance by temperature, possibly generating host defects, and having phonon-assisted transitions. Therefore, CGG is selected as the research target to achieve thermal enhancement and can be used as photothermal sensing under high temperature.…”

Section: Introductionmentioning

confidence: 85%

Abnormal upconversion luminescence induced by defects and Er³⁺–Yb³⁺ distance change in Cs₃GdGe₃O₉:Er³⁺/Yb³⁺ phosphors

et al. 2023

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A series of Er3+/Yb3+ co‐doped Cs3GdGe3O9 (CGG) phosphors were prepared by solid‐phase sintering method, and the microstructure and upconversion luminescence (UCL) properties were tested by variable‐temperature X‐ray diffractometry and variable‐temperature spectrometer. Abnormal UCL phenomena were found, which include UCL intensity continuously increasing under 980 nm laser continuous irradiation and UCL thermal enhancement. After 10 min of continuous irradiation by 980 nm laser at 513 K, the UCL intensity increased 2.91 times compared with the initial UCL intensity. The phenomenon is due to the electron releasing of host defects. The green UCL intensity of CGG:0.1Er3+/0.2Yb3+ decreases at 303–423 K and increases at 423–723 K, which reaches 13.23 times compared with that at 423 K. The phenomenon is due to Er3+–Yb3+ distance change by temperature and phonon‐assisted transitions. In addition, the absolute temperature sensitivities of samples are calculated by luminescence intensity ratio technology, the maximum absolute sensitivity of CGG:0.1Er3+/0.4Yb3+ is 0.00691 K−1 at 546 K, and the maximum relative sensitivity of CGG:0.1Er3+/0.1Yb3+ is 0.01224 K−1 at 303 K. These results indicate that CGG:Er3+/Yb3+ phosphors can be used as a high‐temperature optical thermometer.

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Section: Introductionmentioning

confidence: 85%

Abnormal upconversion luminescence induced by defects and Er³⁺–Yb³⁺ distance change in Cs₃GdGe₃O₉:Er³⁺/Yb³⁺ phosphors

et al. 2023

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“…In addition to adjusting the power density and pulse width of the 980 nm laser, the ambient temperature of the phosphor also greatly affects its emission color. 30 Temperature-dependent contour mapping of UC spectra for the Sr 2 InF 7 : 2%Yb 3+ , 2%Er 3+ phosphor is displayed in Figure 5a, in which the green emission intensity was always much higher than the red emission intensity, and the value of R/G changed little in the 300−480 K temperature range (Figure 5b). This result meant that the emission color of the present sample was almost unaffected by environmental temperature.…”

Section: Green Uc Luminescence Under Differentmentioning

confidence: 99%

External-Field-Independent Thermometric Sensitivity and Green Emission of Upconversion Phosphor Sr₂InF₇: Yb³⁺, Er³⁺

Tang

Jin

et al. 2022

Inorg. Chem.

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Based on luminescence intensity ratio (LIR) technology, the noncontact upconversion (UC) optical temperature sensor has aroused a great deal of interest due to its great application prospects in some extreme environments. However, most of the studies focused on improving its sensitivity due to the fact that the sensitivity can be influenced by many external field factors, such as the power density and pulse width of pumping sources or temperature. Herein, a green-emitting UC phosphor Sr2InF7: Yb3+, Er3+ was developed as a potential thermometer, which retained bright green emission under 980 nm excitation with different pulse widths and power densities or at different temperatures; the possible mechanisms are discussed in detail. Its sensitivity almost remained constant when using both continuous wave (c.w.) and pulsed laser or different power densities, which meant the sensitivity of Sr2InF7: Yb3+, Er3+ was independent of the characteristics of pumping laser. A flexible thin-film thermometer composed of Sr2InF7: 2%Yb3+, 2%Er3+ was also fabricated to detect the temperature of microelectronic components, which can not only accurately measure the temperature of the working electronic circuit board but also exhibit excellent repeatability. The results indicated that the present noncontact UC temperature sensor showed stable green emission and thermometric sensitivity as well as the possibility of replacing the traditional thermometers.

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“…31 Besides, Wei et al reported the non-concentration quenching of the Cs 3 GdGe 3 O 9 :Er 3+ phosphor and successfully applied it to optical thermometers. 32 Here, we synthesized Bi 3+ /Eu 3+ -doped Cs 3 GdGe 3 O 9 (CGGO) phosphors and investigated their photoluminescence properties. The ET mechanism and temperature-dependent luminescence of Cs 3 GdGe 3 O 9 : Bi 3+ ,Eu 3+ were investigated.…”

Section: Introductionmentioning

confidence: 99%

Investigation of multicolor emitting Cs₃GdGe₃O₉:Bi³⁺,Eu³⁺phosphorsviaenergy transfer for WLEDs

Chi

Liu

et al. 2023

Dalton Trans.

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Splendid four-mode optical thermometry design based on thermochromic Cs₃GdGe₃O₉:Er³⁺ phosphors

Abstract: Optical thermometry has emerged as an inspiring area taking account of its unique advantages including contactless operation, rapid response time, excellent spatial resolution, and wide detection range. However, most current...

Cited by 53 publications

References 53 publications

Abnormal upconversion luminescence induced by defects and Er³⁺–Yb³⁺ distance change in Cs₃GdGe₃O₉:Er³⁺/Yb³⁺ phosphors

Abnormal upconversion luminescence induced by defects and Er³⁺–Yb³⁺ distance change in Cs₃GdGe₃O₉:Er³⁺/Yb³⁺ phosphors

External-Field-Independent Thermometric Sensitivity and Green Emission of Upconversion Phosphor Sr₂InF₇: Yb³⁺, Er³⁺

Investigation of multicolor emitting Cs₃GdGe₃O₉:Bi³⁺,Eu³⁺phosphorsviaenergy transfer for WLEDs

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Splendid four-mode optical thermometry design based on thermochromic Cs3GdGe3O9:Er3+ phosphors

Abstract: Optical thermometry has emerged as an inspiring area taking account of its unique advantages including contactless operation, rapid response time, excellent spatial resolution, and wide detection range. However, most current...

Cited by 53 publications

References 53 publications

Abnormal upconversion luminescence induced by defects and Er3+–Yb3+ distance change in Cs3GdGe3O9:Er3+/Yb3+ phosphors

Abnormal upconversion luminescence induced by defects and Er3+–Yb3+ distance change in Cs3GdGe3O9:Er3+/Yb3+ phosphors

External-Field-Independent Thermometric Sensitivity and Green Emission of Upconversion Phosphor Sr2InF7: Yb3+, Er3+

Investigation of multicolor emitting Cs3GdGe3O9:Bi3+,Eu3+phosphorsviaenergy transfer for WLEDs

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Splendid four-mode optical thermometry design based on thermochromic Cs₃GdGe₃O₉:Er³⁺ phosphors

Abnormal upconversion luminescence induced by defects and Er³⁺–Yb³⁺ distance change in Cs₃GdGe₃O₉:Er³⁺/Yb³⁺ phosphors

Abnormal upconversion luminescence induced by defects and Er³⁺–Yb³⁺ distance change in Cs₃GdGe₃O₉:Er³⁺/Yb³⁺ phosphors

External-Field-Independent Thermometric Sensitivity and Green Emission of Upconversion Phosphor Sr₂InF₇: Yb³⁺, Er³⁺

Investigation of multicolor emitting Cs₃GdGe₃O₉:Bi³⁺,Eu³⁺phosphorsviaenergy transfer for WLEDs