Femtosecond laser direct writing PBS quantum dot-doped glass with wide-spectrum fluorescence characteristics and preparation method thereof

Abstract

The invention relates to PbS quantum dot doped glass with a broad spectrum fluorescent characteristic in femtosecond laser direct writing and a preparation method thereof. The quantum dot luminescent glass comprises a glass substrate and a photoluminescent part which is obtained by femtosecond laser focus irradiation in the glass substrate. The prepared luminescent glass is doped with sulfur and lead, and lead sulfide quantum dots are precipitated inductively in a laser irradiation area through the femtosecond laser focus irradiation, so that the area has a photoluminescent characteristic. A light emitting area has higher light-emitting strength, a wider near-infrared band of 860 to 1,700 nanometers is covered, and the PbS quantum dot doped glass has application prospects on the aspects of near-infrared broadband spectrum light sources and the like.

Description

technical field [0001] The invention relates to a luminescent glass, in particular to a femtosecond laser direct writing PbS quantum dot-doped glass with wide-spectrum fluorescence characteristics and a preparation method thereof. Background technique [0002] The lead sulfide and lead selenide quantum dot materials developed in recent years exhibit many unique optical properties due to their quantum confinement effect, size effect and surface effect. The most notable is that their luminescence spectrum can cover a wide range of near-infrared band, so it has attracted much attention in infrared detection and near-infrared fluorescence applications. [0003] The currently reported quantum dot-doped glass is mainly prepared by heat treatment, that is, the prepared glass substrate is kept at a certain temperature range higher than the glass transition point for a period of time. However, the preparation of quantum dot-doped glass by heat treatment requires high temperature, lo...

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Problems solved by technology

However, the preparation of quantum dot-doped glass by heat treatment requires high temperature, long time, and large energy consumption.

At the same time, the quantum dot-doped glass prepared by heat treatment method, the particle size distribution range of quantum dots in the glass matrix is ​​affected by the heat treatment temperature and time. Generally, the half-maximum width of the fluorescence peak of quantum dot-doped glass is narrow. Difficult to prepare quantum dot-doped glasses with broad fluorescence spectral properties

In addition, in the quantum dot-doped glass prepared by heat treatment, the quantum dots are uniformly distributed in the glass matrix, and the spatial distribution of the quantum dots in the glass matrix cannot be controlled. It is difficult to prepare optical functional devices of quantum dot-doped glass by this method.

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