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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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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

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Dynamically regulated electroluminescence via strain engineering.

Junfeng Lu, Yang Liu, Wei Liu

|March 15, 2022

Summary

This summary is machine-generated.

Researchers developed a new electroluminescent device with a dynamically tunable emission wavelength using the piezoresistive effect. This innovation enables precise control over light emission for advanced lighting and display applications.

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Area of Science:

Materials Science
Solid-State Physics
Optoelectronics

Background:

Dynamic control of light-emission wavelength is crucial for advanced lighting, display, and sensing technologies.
Existing electroluminescent devices often lack efficient wavelength tunability.

Purpose of the Study:

To develop an electroluminescent device with a dynamically tunable emission wavelength.
To investigate the underlying luminescence mechanism and strain-induced wavelength shift.

Main Methods:

Fabrication of an electroluminescent device utilizing the piezoresistive effect.
Application of external strain to tune the emission wavelength.
Systematic analysis of the luminescence mechanism and band structure changes.

Main Results:

Achieved a dynamically tunable emission wavelength range of up to 12 nm with 0.148% external strain.
Identified the luminescence mechanism as electron transition via thermal tunneling excitation with multi-phonon participation.
Determined that wavelength shift results from band narrowing and altered crystal fields under tensile strain.

Conclusions:

The piezoresistive effect offers a novel strategy for creating wavelength-tunable electroluminescent devices.
This approach provides a new pathway for developing advanced light-emitting technologies.