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Photoluminescence: Applications

Photoluminescence: Applications

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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Halogen-Engineered Copper-Based Materials with Multicolor Emission for Dual-Functional Anticounterfeiting and LED

Chenyi Zhang¹, Duanliang Wang¹, Chuanrui Zhu¹

¹College of Physics and Engineering, Qufu Normal University, Qufu 273165, PR China.

ACS Applied Materials & Interfaces

|July 22, 2025

Summary

Two novel zero-dimensional copper halides were synthesized with excellent photoluminescence. Halogen regulation enhanced performance, enabling applications in anticounterfeiting and solid-state lighting.

Keywords:

Cu(I)-based halides LED anticounterfeiting photoluminescence tunable dual-color luminescence

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Area of Science:

Materials Science
Solid-State Chemistry
Photophysics

Background:

Low-dimensional metal halides are promising for optoelectronic applications.
Copper-based halides offer tunable emission properties.
Understanding structure-property relationships is crucial for material design.

Purpose of the Study:

Synthesize novel zero-dimensional (0D) copper-based halides.
Investigate their photoluminescence properties and structure-performance relationships.
Explore potential applications in anticounterfeiting and solid-state lighting.

Main Methods:

Simple solution synthesis method.
Single-crystal X-ray diffraction for structural analysis.
Photoluminescence spectroscopy (PLQY, spectra, lifetime).
First-principles calculations for theoretical investigation.

Main Results:

Successfully synthesized two novel 0D Cu-based halides: (C6H7ClN)4Cu2Cl6 and (C6H7ClN)4Cu2Br6.
Both compounds exhibit broadband green-yellow and green emissions, respectively, attributed to self-trapped exciton (STE) mechanisms.
Photoluminescence quantum yield (PLQY) increased from 59.68% to 71.15% upon replacing Cl- with Br-.
Long microsecond lifetimes and large Stokes shifts were observed.
First-principles calculations elucidated the structure-performance correlations.

Conclusions:

The synthesized copper halides demonstrate excellent photoluminescence properties.
Halogen regulation is an effective strategy to enhance PLQY.
These materials show potential for anticounterfeiting technologies and solid-state lighting applications.