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Green Perovskite Distributed Feedback Lasers.

J R Harwell¹, G L Whitworth¹, G A Turnbull¹

¹Organic Semiconductor Centre, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom.

Scientific Reports

|September 17, 2017

Summary

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Researchers created the first visible perovskite distributed feedback laser using nanocrystal pinning. This stable laser emits light at 550 nm with a low threshold, enabling tunable polarization modes.

Area of Science:

Materials Science
Optoelectronics
Photonics

Background:

Perovskite materials offer unique optical properties for laser applications.
Developing stable, visible-light lasers with low thresholds remains a challenge.
Distributed feedback (DFB) lasers require precise control over gain medium and grating structure.

Purpose of the Study:

To fabricate and characterize the first visible perovskite distributed feedback (DFB) laser.
To investigate the use of nanocrystal pinning for enhanced film stability and luminescence.
To demonstrate tunable polarization mode operation in perovskite DFB lasers.

Main Methods:

Fabrication of methylammonium lead bromide (MABr) perovskite films using nanocrystal pinning.
Integration of MABr films into a distributed feedback (DFB) laser structure.

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Characterization of laser emission wavelength, threshold, stability, and polarization properties.

Main Results:

Successful fabrication of a visible perovskite DFB laser emitting at 550 nm.
Achieved a low lasing threshold of 6 µJcm^-2.
Demonstrated stable laser operation supporting multiple polarizations.
Showcased the ability to switch between transverse magnetic (TM) and transverse electric (TE) modes by tuning the DFB grating period.

Conclusions:

Nanocrystal pinning is an effective method for creating highly luminescent and stable perovskite films for laser applications.
The developed perovskite DFB laser represents a significant advancement in visible light laser technology.
The tunable polarization capability opens avenues for novel optoelectronic device designs.