Silver sulfide/silver sulfide zinc core-shell quantum dot-contained coffee-ring laser and fabrication method thereof

Abstract

The invention discloses a silver sulfide / silver sulfide zinc core-shell quantum dot-contained coffee-ring laser and a fabrication method thereof. The coffee-ring laser comprises a quartz substrate anda silver sulfide / silver sulfide zinc core-shell quantum dot-contained silicon dioxide round ring which are sequentially and upwards arranged. Low-threshold near-infrared light gain is achieved by employing low-toxicity lowest quantum-state double degenerated silver sulfide dot to substitute lowest quantum-state eightfold degenerated lead salt quantum dot, a smooth interface barrier is built and asurface of the silver sulfide quantum dot is passivated by coating the surface of the silver sulfide quantum dot with a silver sulfide zinc alloy shell of which the content of a zinc element is gradually increased from inside to outside, and the light gain threshold can be further reduced; by embedding the quantum dot into silicon dioxide, the stability of the laser can be improved, and the lifetime of the laser can be prolonged; and a coffee ring is fabricated from a mixed liquid of the silver sulfide / silver sulfide zinc core-shell quantum dot and perhydrosilane, and the environmental-friendly coffee-ring near-infrared quantum-dot laser with a low threshold and high stability can be finally obtained.

Description

technical field [0001] The invention relates to a coffee ring laser containing silver sulfide / silver-zinc sulfide 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 emission...

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Problems solved by technology

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

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