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Surface Vertical Multi-Emission Laser with Distributed Bragg Reflector Feedback from CsPbI3 Quantum Dots.

Xueqiong Su1, Yong Pan2, Dongwen Gao1

  • 1College of Physics and Optoelectronics, Faculty of Science, Beijing University of Technology, Beijing 100124, China.

Nanomaterials (Basel, Switzerland)
|May 27, 2023
PubMed
Summary

Researchers developed a stable multi-wavelength perovskite quantum dots laser using a distributed Bragg reflector (DBR). This breakthrough addresses limitations of single-wavelength DBRs, enabling advanced micro-applications with tunable near-infrared output.

Keywords:
CsPbI3 perovskiteDBR laserQDsmultiwavelength

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Area of Science:

  • Quantum optics
  • Materials science
  • Nanotechnology

Background:

  • Single-wavelength distributed Bragg reflector (DBR) lasers face limitations in signal transmission for micro-applications.
  • Achieving simple, stable multi-wavelength DBR lasing output remains a significant challenge.

Purpose of the Study:

  • To develop a stable multi-wavelength quantum dots (QDs) laser in the near-infrared region.
  • To utilize perovskite CsPbI3 QDs integrated into a DBR structure for enhanced laser performance.

Main Methods:

  • Fabrication of a CsPbI3 quantum dots laser with a DBR structure.
  • Characterization using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM).
  • Finite-difference time-domain (FDTD) simulation for optical propagation analysis.

Main Results:

  • Confirmation of a tetragonal crystal structure for CsPbI3 QDs with no defects.
  • Observation of elliptical light propagation and multi-wavelength laser output at 770 nm, 823 nm, and 873 nm.
  • Demonstration of a stable laser emission time of approximately 2 hours with an average fluorescence quantum yield of 60%.

Conclusions:

  • An effective and stable multi-wavelength CsPbI3 quantum dots DBR laser has been realized.
  • The study provides insights into the working mechanism through cavity length selection and energy level modeling.
  • This development offers a promising solution for advanced micro-application needs requiring tunable laser outputs.