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Updated: Jul 12, 2025

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

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

Summary

This summary is machine-generated.

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.