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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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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Deciphering Defect-Mediated Anti-Thermal Quenching Multimodal Luminescence for Information Encryption.

Yuefei Xiang¹, Lei Zhong¹, Youwang Long¹

¹Zhuhai Key Laboratory of Optoelectronic Functional Materials and Membrane Technology /School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.

Advanced Materials (Deerfield Beach, Fla.)

|November 20, 2025

Summary

This summary is machine-generated.

Researchers developed novel SrZnP2O7:RE phosphors with tunable multicolor emissions for optical encryption. These materials exhibit excellent anti-thermal quenching properties, crucial for advanced anti-counterfeiting and X-ray imaging applications.

Keywords:

advanced encryption anti‐thermal quenching defect‐engineering high‐temperature X‐ray imaging multimodal luminescence

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Area of Science:

Materials Science
Solid State Chemistry
Luminescence

Background:

Multimodal luminescent materials are key for optical information encryption.
Achieving high-performance multimodal luminescence with anti-thermal quenching (ATQ) is a significant challenge.

Purpose of the Study:

To develop novel SrZnP2O7:RE (RE = Sm3+, Dy3+, Tb3+, Tm3+) phosphors with tunable multicolor emissions and ATQ properties.
To investigate the role of defect engineering and charge compensation in modulating luminescence.

Main Methods:

Synthesis of SrZnP2O7:RE phosphors with varying charge compensators (Li+, Na+, K+).
Characterization of multimodal luminescence: photoluminescence (PL), radioluminescence (RL), mechanoluminescence (ML), thermoluminescence (TL), and persistent luminescence (PersL).
Analysis of trap distribution and defect states influencing luminescence and ATQ behavior.

Main Results:

Phosphors exhibit multimodal luminescence spanning 350-750 nm.
Charge compensation precisely regulated trap density, enhancing PL, quantum efficiency, RL intensity, and X-ray afterglow.
Engineered deep traps in Sm/Dy/Tm-doped phosphors demonstrated exceptional ATQ behavior.

Conclusions:

Defect engineering and charge compensation are critical for tailoring multimodal luminescence and ATQ properties.
The developed phosphors show great promise for X-ray imaging and high-security anti-counterfeiting/encryption.
This work provides insights into defect-luminescence relationships and a framework for designing advanced optical materials.