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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
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.
- 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.
