Coffee-ring lase containing silver telluride/silver zinc telluride core-shell quantum dot and preparation method thereof

Abstract

The invention discloses a coffee-ring laser containing silver telluride / silver zinc telluride core-shell quantum dots and a preparation method thereof. The coffee ring laser comprises a quartz substrate arranged upward in turn, and a silicon dioxide ring containing silver telluride / silver zinc telluride core-shell quantum dots. The invention replaces the lead salt quantum dot of the lowest quantumstate 8 with the silver telluride quantum dot of the lowest toxic lowest quantum state 2 times degenerate, In order to achieve low threshold near-infrared optical gain, silver telluride quantum dotswere coated with silver-zinc telluride alloy shell whose zinc content increased gradually from inside to outside to construct smooth interface barrier and passivate the surface of silver telluride quantum dots, which could further reduce the optical gain threshold. The stability and lifetime of the laser can be improved by embedding the quantum dots into the silicon dioxide. A low threshold, highstability and environmentally friendly coffee ring near infrared quantum dot laser was fabricated by using silver telluride / silver telluride-zinc core-shell quantum dot and perhydropolysilazane as rawmaterials.

Description

technical field [0001] The invention relates to a coffee ring laser containing silver telluride / silver zinc telluride core-shell quantum dots and a preparation method thereof, belonging to the technical field of semiconductor optoelectronic devices. Background technique [0002] Near-infrared lasers can be widely used in fields such as optical communication, remote sensing, and coherent plasma generation. Benefiting from the quantum confinement effect, semiconductor quantum dots exhibit a variety of superior properties as optical gain materials, such as tunable emission wavelength with size, potentially low laser threshold and temperature-insensitive laser performance. At present, near-infrared quantum dot lasers prepared by molecular beam epitaxy have begun commercial applications. Compared with epitaxially grown quantum dots, colloidal quantum dots have a smaller size and a more uniform size distribution, so they have stronger quantum confinement effects and narrower emis...

AI Technical Summary

Problems solved by technology

However, directly exposing the quantum dots to air reduces the stability and lifetime of the laser

Images