Compensation effect of electron traps for enhanced fluorescence intensity ratio thermometry performance

Zuo, Zhi-Han; Jiang, Song-Lin; Zhang, Zhihao; Liang, Jinhui; Li, Junhao; Liu, Zhao‐Qing; Chen, Yibo

doi:10.1039/d2qi00284a

Cited by 14 publications

(7 citation statements)

References 49 publications

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“…Clearly, the obtained S r values are completely different, implying that the thermometric properties of the developed optical thermometers can be regulated by changing the excitation wavelength. Furthermore, as shown in Figure 5g, compared with those of previously developed optical thermometers, [2,11,19,24,[32][33][34][35][36][37][38][39][40][41] the obtained S r values are relatively good, making the yL-MGO:Mn phosphors promising candidates for non-invasive and remote temperature monitoring via the FIR technique.…”

Section: Resultsmentioning

confidence: 81%

Precisely Manipulating the Self‐Reduction of Manganese in MgGa₂O₄ through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Xue

Runowski

et al. 2023

Advanced Optical Materials

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Manganese (Mn) doped MgGa2O4 (MGO) phosphors are prepared by a solid‐state reaction technique in air. Upon UV light excitation, the featured green and red emissions of Mn2+ and Mn4+, respectively, are detected in the Mn‐doped MGO phosphors, indicating the incomplete self‐reduction behavior of Mn in the MGO host lattices. To clarify the incomplete self‐reduction behavior, theoretical calculations based on density functional theory and bond energy theory are performed. Moreover, the self‐reduction behavior of Mn can be manipulated by the incorporation of Li+, leading to the precise regulation of the Mn2+ and Mn4+ contents in the MGO host lattices. Based on the ionic radii, the inhibited self‐reduction mechanism is triggered by Li+ occupying the tetrahedral Mg2+ site, leading to the reduced occupancy of tetrahedral Mg2+ sites by Mn ions, and forcing Mn to take up the octahedral Ga3+ sites. Furthermore, the afterglow properties of phosphors with wide and continuous multiple traps are studied in detail. Finally, based on unique luminescence properties of the phosphors, their potential application in ratiometric optical thermometer and optical anti‐counterfeiting is also systematically exploited.

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Section: Resultsmentioning

confidence: 81%

Precisely Manipulating the Self‐Reduction of Manganese in MgGa₂O₄ through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Xue

Runowski

et al. 2023

Advanced Optical Materials

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“…Multiple tetrahedral and octahedral sites in MISO spinel are appropriate for Mn 2+ and Mn 4+ doping, thereby realizing perspective applications in solid-state lighting, as observed for many AB 2 O 4 -type spinels. − A phosphor series MISO/ x Mn was thus rationally designed to functionalize and expand the application of this newly discovered spinel. The PLE spectra of MISO/ x Mn monitored at 496 nm are depicted in Figure a.…”

Section: Resultsmentioning

confidence: 99%

Mg₄InSbO₈ Spinel: Double 2:1 Ordering in Tetrahedral and Octahedral Sublattices and Perspective Application as an Optical Thermometer via Mn^2+/4+ Doping

Cheng,

Huang,

et al. 2023

Chem. Mater.

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AB2O4-type spinel oxides were extensively investigated as prospective magnetic, photocatalytic, cathode, and host materials. Herein, a new Mg4InSbO8 spinel was rationally designed and structurally characterized by high-resolution X-ray powder diffraction (XRPD) in combination with neutron powder diffraction. Mg4InSbO8 crystallizes in the Imma-superstructure with lattice dimensions of a = √2/2·a C, b = 3√2/2·a C, and c = a C, where a C is the lattice parameter of the cubic (Fd3̅m) archetype spinel. The formation of this hitherto unreported Imma-spinel superstructure is a result of 2:1 Mg2+/Sb5+ ordering in the octahedral sublattice, which further creates two crystallographically independent tetrahedral sites with distinctive sizes and thereby resulting in a site-selective 2:1 occupation for the Mg2+ and In3+ cations. Mg4InSbO8 is the first spinel superstructure exhibiting double 2:1 cationic ordering in both octahedral and tetrahedral sublattices. Compared with other ordered spinel structures, we found that the ionic radius and charge differences, coordination geometry preference, and chemical bonding character are all responsible for the formation of this unique doubly ordered spinel superstructure of Mg4InSbO8. Theoretical calculations, together with diffuse reflectance spectroscopy, revealed that Mg4InSbO8 is an indirect semiconductor. Moreover, the multiple tetrahedral and octahedral sites in Mg4InSbO8 are appropriate for green- and deep-red-emitting Mn2+ and Mn4+ activators, respectively. Tunable color emission from green to white and then to deep red can be achieved for Mg4InSbO8/Mn2+/4+ phosphors by adjusting the excitation energy. More importantly, Mn2+ and Mn4+ activators experience distinctive thermal quenching responses, thereby resulting in a vivid color change from green to red for Mg4InSbO8/Mn2+/4+ upon heating. The highest sensitivity for color change is S r = 2.10% at 453 K, manifesting potential applications in temperature sensing. Our findings pave the way to designing cation-ordered spinel superstructures and exploring and expanding their prospective applications.

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“…Precise temperature measurements are significant in research projects and industrial production. [1][2][3][4] Traditional thermometers, such as glass thermometers and thermocouple junction thermometers, are invalid when the size of the object under investigation is down to the sub-micrometer scale or when non-contact temperature detection with a high spatial resolution is required. 5,6 Recently, luminescent materials have been highlighted as fascinating tools for optical thermometry.…”

Section: Introductionmentioning

confidence: 99%

Tetrahedrally coordinated rigid crystal structure enables partial self-reduction of mixed-valence europium for optical thermometric application

et al. 2023

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Compensation effect of electron traps for enhanced fluorescence intensity ratio thermometry performance

Abstract: How the electron traps in the host matrix impact the fluorescence intensity ratio (FIR) thermometry performance in inorganic phosphors is still unclear. In this work, the relationships between temperature-dependent photoluminescence,...

Cited by 14 publications

References 49 publications

Precisely Manipulating the Self‐Reduction of Manganese in MgGa₂O₄ through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Precisely Manipulating the Self‐Reduction of Manganese in MgGa₂O₄ through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Mg₄InSbO₈ Spinel: Double 2:1 Ordering in Tetrahedral and Octahedral Sublattices and Perspective Application as an Optical Thermometer via Mn^2+/4+ Doping

Tetrahedrally coordinated rigid crystal structure enables partial self-reduction of mixed-valence europium for optical thermometric application

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Compensation effect of electron traps for enhanced fluorescence intensity ratio thermometry performance

Abstract: How the electron traps in the host matrix impact the fluorescence intensity ratio (FIR) thermometry performance in inorganic phosphors is still unclear. In this work, the relationships between temperature-dependent photoluminescence,...

Cited by 14 publications

References 49 publications

Precisely Manipulating the Self‐Reduction of Manganese in MgGa2O4 through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Precisely Manipulating the Self‐Reduction of Manganese in MgGa2O4 through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Mg4InSbO8 Spinel: Double 2:1 Ordering in Tetrahedral and Octahedral Sublattices and Perspective Application as an Optical Thermometer via Mn2+/4+ Doping

Tetrahedrally coordinated rigid crystal structure enables partial self-reduction of mixed-valence europium for optical thermometric application

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Precisely Manipulating the Self‐Reduction of Manganese in MgGa₂O₄ through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Precisely Manipulating the Self‐Reduction of Manganese in MgGa₂O₄ through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

Mg₄InSbO₈ Spinel: Double 2:1 Ordering in Tetrahedral and Octahedral Sublattices and Perspective Application as an Optical Thermometer via Mn^2+/4+ Doping