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Dual-Wavelength Lasing Due to Second Phase Inclusions in MAPbCl₃.

Christina Siaitanidou^1,2, Violeta Spanou³, Nikolaos G Chatzarakis^1,2

¹Department of Materials Science & Engineering, University of Crete, P.O. Box 2208, 70013 Heraklion, Greece.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces

|December 4, 2025

Summary

This summary is machine-generated.

Researchers achieved dual-wavelength lasing in methylammonium lead chloride (MAPbCl3) single crystals at 78 K. This unusual behavior is linked to a previously unreported "second phase" within the crystals, potentially enabling new photonic devices.

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Area of Science:

Materials Science
Optics
Solid-State Physics

Background:

Methylammonium lead chloride (MAPbCl3) is a promising material for optoelectronic applications.
Understanding the fundamental optical properties of MAPbCl3 single crystals is crucial for device development.

Purpose of the Study:

To investigate the mechanism behind dual-wavelength lasing observed in MAPbCl3 single crystals at low temperatures.
To characterize the optical properties of MAPbCl3 single crystals and identify factors contributing to unusual lasing behavior.

Main Methods:

Temperature-dependent optical experiments were conducted on ultrasmooth MAPbCl3 single crystals.
Microreflectivity measurements were used to analyze excitonic features.
Lasing behavior was investigated in a vertical cavity setup.

Main Results:

Dual-wavelength lasing was achieved at 78 K in MAPbCl3 single crystals.
A previously unreported excitonic peak at ~412 nm was discovered, distinct from the standard ~385 nm orthorhombic bandgap.
This second excitonic feature, attributed to a "second phase" possibly related to quantum dot-like nanostructures, aligns with the second lasing line and persists up to 300 K.

Conclusions:

The dual-wavelength lasing in MAPbCl3 is attributed to the coexistence of the primary orthorhombic phase and a secondary phase.
This secondary phase, likely associated with nanostructures, influences the optical properties and lasing behavior.
The findings enhance the understanding of MAPbCl3 systems and suggest potential for blue-UV photonic devices.