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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Related Experiment Video

Updated: Jul 12, 2025

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Quantifying rigidity for thermally stable Cr3+ phosphors.

Shaojian Xu1, Jiahao Feng1, Daidi Zhang1

  • 1School of Applied Physics and Materials, Wuyi University, Jiangmen, 529020, P. R. China. ontaii@163.com.

Physical Chemistry Chemical Physics : PCCP
|October 25, 2023
PubMed
Summary

Vickers hardness predicts thermal stability in near-infrared (NIR) phosphors. This finding aids in developing robust NIR light-emitting diodes (LEDs) by identifying superior host materials.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Near-infrared (NIR) phosphors are crucial for advanced NIR light-emitting diodes (LEDs), demanding high thermal stability.
  • Debye temperature has been a traditional metric for phosphor thermal stability, but its limitations due to atomic mass dependence are recognized.

Purpose of the Study:

  • To identify a more reliable predictor of thermal stability for Cr3+-doped NIR phosphors.
  • To explore the correlation between Vickers hardness and thermal properties, overcoming limitations of Debye temperature.

Main Methods:

  • Density functional theory (DFT) calculations were employed to investigate 13 distinct NIR phosphor materials.
  • Vickers hardness, Stokes shifts, and thermal stability were calculated and analyzed for correlations.

Main Results:

  • Vickers hardness showed a strong positive correlation with thermal stability (Pearson's R = 0.85) and a negative correlation with Stokes shifts (Pearson's R = -0.81).
  • New NIR phosphors KMg(PO3)3:Cr3+ (low stability) and La2MgSnO6:Cr3+ (high stability) validated the Vickers hardness predictions.
  • DFT calculations enabled predictable assessment of Vickers hardness, independent of atomic mass.

Conclusions:

  • Vickers hardness is a superior indicator for screening Cr3+-doped NIR phosphor hosts with high thermal stability.
  • This approach facilitates the rational design of materials for high-performance NIR LEDs.