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A kind of preparation method of colloidal quantum dot microdisk by water drop method

A technology of colloidal quantum dots and microdisks, which is applied in the field of colloidal quantum dots and microdisk lasers, can solve the problems of not realizing the integration of nanophotonics devices, complicated manufacturing methods, etc., and achieve the effects of uniform interior, flat surface and narrow line width.

Inactive Publication Date: 2019-04-05
PEKING UNIV
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  • Application Information

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Problems solved by technology

However, except for the WGM bubble laser, the manufacturing methods of the above-mentioned microcavities are still very complicated and require special processing equipment
More importantly, these small-sized colloidal quantum dot lasers have not yet achieved on-chip integration with other nanophotonics devices such as waveguides.

Method used

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  • A kind of preparation method of colloidal quantum dot microdisk by water drop method
  • A kind of preparation method of colloidal quantum dot microdisk by water drop method
  • A kind of preparation method of colloidal quantum dot microdisk by water drop method

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Embodiment Construction

[0032] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, the preparation method of the colloidal quantum dot microdisk by the water drop method of the present embodiment comprises the following steps:

[0034] 1) CdSe / ZnS core / shell quantum dots are dissolved in hexane. The CdSe core diameter and ZnS shell thickness of the quantum dots are 6.7±0.2nm and 1.5±0.3nm respectively, and the surface ligand is oleic acid. The quantum dots in the solution The efficiency is close to 62%. Octane is added to the hexane quantum dot solution to form a mixed solvent colloidal quantum dot solution, and the volume ratio of hexane to octane is 5:1;

[0035] 2) Provide a glass substrate with a clean surface: ultrasonic cleaning in toluene, acetone and alcohol for 7 minutes;

[0036] 3) Control the ambient temperature at 25°C, and drop-coat the mixed solvent colloidal proton dot...

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Abstract

The invention discloses a preparation method of a colloid quantum-dot microdisc by a water drop method. Colloid quantum dots are dissolved in two organic solvents with different chain lengths, the organic solvents are coated on a film formation substrate in a dropwise way by controlling the volume ratio and an ambient temperature of the two organic solvents, and a high-quality colloid quantum-dot thin film is formed after the hybrid solvent is completely volatilized by braking; and residual stress in the colloid quantum-dot thin film is released by surface tension of water drops and by dropping water on a surface of the colloid quantum-dot thin film, the colloid quantum-dot thin film is broken to form a large amount of small blocks in different shapes at a colloid quantum-dot thin film-water-air three-phase contact line, a micrometer-size colloid quantum-dot microdisc is formed and is transferred onto a transfer substrate with a clean surface, a single-mode and multi-mode room-temperature on-chip laser is achieved under the effect of pumping light, on-chip integration with a waveguide is achieved. The colloid quantum-dot microdisc is also very stable in a severe environment, the method is simple is low in cost and has important significance to the field of a solid-state and small-size laser.

Description

technical field [0001] The invention relates to a colloidal proton dot microdisk laser, in particular to a method for preparing a colloidal proton dot microdisk by a water drop method. Background technique [0002] Due to the low fabrication cost of colloidal quantum dots, high quantum yield (~100%), and tunable wavelength of modulating radiation, solution-processable colloidal quantum dots have been extensively studied in the laser field in the past decade or so. Colloidal quantum dots can be made by inexpensive chemical synthesis. By changing the size and composition of colloidal proton dots, the radiation wavelength of colloidal proton dot lasers has covered the entire visible region and near-infrared. Therefore, colloidal quantum dots solve the problems encountered by traditional semiconductor materials in the blue light band, and they can also be fabricated into densely packed quantum dot solids. In addition, the properties of colloidal quantum dots are very stable. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/10C09K11/88C09K11/02
CPCC09K11/025C09K11/883H01S5/1042H01S5/1067
Inventor 陈建军容科秀孙成伟施可彬龚旗煌
Owner PEKING UNIV
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