Perovskite Quantum Dots Lasing in Double-Heterostructure through Energy Transfer

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Planar double heterostructures are crucial for III-V semiconductor lasers, confining photons and carriers.
• Perovskite quantum dots (QDs) offer promising optoelectronic properties for laser applications.

Purpose of the Study:

• To design and fabricate a novel perovskite double-heterostructure for efficient single-mode green lasing.
• To investigate the role of energy transfer in reducing lasing thresholds.

Main Methods:

• Fabrication of a (PEA)2CsPbX3 (quasi-2D)/CsPbBr3 QD/quasi-2D double-heterostructure within a microcavity.
• Optical pumping using nanosecond pulses.
• Analysis using transient absorption and luminescence lifetime spectroscopy.

Main Results:

• Demonstration of single-mode pure-green lasing with a low threshold of 53.7 μJ/cm².
• A statistically significant 50% reduction in lasing thresholds compared to control devices.
• Evidence of efficient energy transfer from quasi-2D perovskite layers to QDs.

Conclusions:

• Perovskite double-heterostructures enable efficient energy transfer, leading to reduced lasing thresholds.
• This configuration is highly promising for the development of future electrically pumped perovskite lasers.