阅读说明：本技术 一种室温钙钛矿量子点垂直腔面发射激光器及制备方法 (Room-temperature perovskite quantum dot vertical-cavity surface-emitting laser and preparation method thereof ) 是由 陈少强 刘慧敏 赵春虎 翁国恩 胡小波 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种室温钙钛矿量子点垂直腔面发射激光器及制备方法,涉及激光器技术领域,其制备方法是在两片面积为2cm*2cm的分布布拉格反射镜片之间生长钙钛矿量子点薄膜,并用光学胶黏剂包裹住镜片的周边,形成黏着牢固的三明治结构体。钙钛矿量子点作为一种新型量子点材料,荧光光谱线宽较窄,发光特性优异。本发明采用量子点薄膜作为增益介质,实现一种低阈值高效绿光的垂直腔面发射激光器。本发明提供的方法缩短了量子点在DBR上的生长时间,且生长的薄膜具有较好的发光性能和稳定性,发明提供的方法成本低、步骤简单。(The invention discloses a room temperature perovskite quantum dot vertical cavity surface emitting laser and a preparation method thereof, relating to the technical field of lasers, wherein the preparation method comprises the steps of growing a perovskite quantum dot film between two distributed Bragg reflector lenses with the area of 2cm x 2cm, and wrapping the periphery of the lenses by an optical adhesive to form a firmly adhered sandwich structure body. As a novel quantum dot material, the perovskite quantum dot has narrow fluorescence spectrum line width and excellent luminescence property. The invention adopts the quantum dot film as the gain medium to realize the low-threshold high-efficiency green-light vertical cavity surface emitting laser. The method provided by the invention shortens the growth time of the quantum dots on the DBR, and the grown thin film has better luminous performance and stability.)

1. A method for preparing a room temperature perovskite quantum dot vertical cavity surface emitting laser is characterized by comprising the following specific steps:

step 1: PbBr₂Adding the powder into anhydrous N, N-dimethylformamide, magnetically stirring for 5-10 min at 500r/min to PbBr₂Dissolving the powder; wherein PbBr₂The molar concentration of the N, N-dimethylformamide is 0.04 mol/L;

step 2: dripping oleylamine into the mixed solution in the step 1, wherein the volume ratio of the oleylamine to the N, N-dimethylformamide is 1:100, magnetically stirring for 1-2 min at the rotating speed of 500 r/min;

and step 3: dripping oleic acid into the mixed solution in the step 2, wherein the volume ratio of the oleic acid to the N, N-dimethylformamide is 1:10, magnetically stirring for 1-2 min at the rotating speed of 500 r/min;

and 4, step 4: adding CsBr powder into the mixed solution in the step 3, wherein CsBr and PbBr are added₂The molar ratio of the mixture is 1:1, and the mixture is magnetically stirred until the mixed solution is clear and transparent, wherein the time is 120-180 min;

and 5: injecting the clear and transparent solution obtained in the step 4 into an anhydrous toluene solution preheated to 60 ℃ in magnetic stirring by using a liquid-transferring gun, wherein the volume ratio of the clear and transparent solution to the anhydrous toluene solution is 1: 10;

step 6: centrifuging the mixed solution obtained in the step (5) at the speed of 4000rpm for 20-30 seconds, taking the precipitate after the centrifugation is finished, and adding a toluene solvent to fully dissolve the precipitate;

and 7: after the toluene mixed solution in the step 6 is uniformly shaken, centrifuging at 8000rpm for 20-30min, and taking the supernatant as the perovskite quantum dot solution;

and 8: taking two distributed Bragg reflector lenses with the area of 2cm by 2cm, and sequentially cleaning the two distributed Bragg reflector lenses by using anhydrous N, N-dimethylformamide and anhydrous ethanol;

and step 9: taking out a cleaned distributed Bragg reflector lens, heating to 60 ℃, and dropwise adding perovskite quantum dot solution on the surface of the lens in an amount of 3-12uL/cm²Uniformly coating an optical adhesive on one surface of the other distributed Bragg reflector lens, and vertically covering the optical adhesive on the perovskite quantum dot solution to form a sandwich structure of the distributed Bragg reflector lens-the perovskite quantum dot solution-the distributed Bragg reflector lens;

step 10: curing the optical adhesive: uniformly coating optical adhesive on the periphery of the sandwich structure to wrap the periphery of the sandwich structure; and preparing the room-temperature perovskite quantum dot vertical cavity surface emitting laser.

2. A room temperature perovskite quantum dot vertical cavity surface emitting laser made by the method of claim 1.

Technical Field

The invention relates to the technical field of lasers, in particular to a preparation method of a room-temperature perovskite quantum dot vertical cavity surface emitting laser and a vertical cavity surface emitting laser.

Background

In the world, the development of information technology industry is rapid, and the progress of information technology is not slow as an important mark for measuring the comprehensive strength of a country or a region, and the development of information technology is urgent without the continuous update of semiconductor materials and optoelectronic materials, and the progress of optical technology, the development of materials and optical technology.

As a novel quantum dot material, the perovskite quantum dot has the advantages that the light-emitting wavelength is adjustable in a visible light wave band, the width of a fluorescence spectrum line is narrow, and the fluorescence quantum efficiency is as high as 90%. A laser is a device that uses the principle of stimulated emission to amplify or oscillate light in certain excited substances to emit laser light. Compared with the traditional laser, the micro-nano structure laser has great advantages. By the confinement of the cavity, the rate at which spontaneous radiation can couple into the lasing mode is increased, enabling the threshold of the laser to be very low, which will help reduce power consumption in the integrated optical circuit. The micro-nano structure laser has small geometric dimension, and when the micro-nano structure laser is integrated on a large scale, the micro-nano structure laser has the characteristics of greatly reducing the volume of an integrated device, having high light absorption coefficient, having high defect tolerance and the like.

Disclosure of Invention

The invention aims to provide a preparation method of a room-temperature perovskite quantum dot vertical cavity surface emitting laser, which is characterized in that a perovskite quantum dot film grows between two distributed Bragg reflector lenses with the area of 2cm x 2cm, and the periphery of the lenses is wrapped by an optical adhesive to form a firmly-adhered sandwich structure.

The specific technical scheme for realizing the invention is as follows:

a method for preparing a room temperature perovskite quantum dot vertical cavity surface emitting laser comprises the steps of preparing a low-threshold green-light vertical cavity surface laser by using perovskite quantum dots obtained at room temperature as a gain medium; the method comprises the following specific steps:

step 1: PbBr₂Adding the powder into anhydrous N, N-dimethylformamide, magnetically stirring for 5-10 min at 500r/min to PbBr₂Dissolving the powder; wherein PbBr₂The molar concentration of the N, N-dimethylformamide is 0.04 mol/L;

step 2: dripping oleylamine into the mixed solution in the step 1, wherein the volume ratio of the oleylamine to the N, N-dimethylformamide is 1:100, magnetically stirring for 1-2 min at the rotating speed of 500 r/min;

and step 3: dripping oleic acid into the mixed solution in the step 2, wherein the volume ratio of the oleic acid to the N, N-dimethylformamide is 1:10, magnetically stirring for 1-2 min at the rotating speed of 500 r/min;

and 4, step 4: adding CsBr powder into the mixed solution in the step 3, wherein CsBr and PbBr are added₂The molar ratio of the mixture is 1:1, and the mixture is magnetically stirred until the mixed solution is clear and transparent, wherein the time is 120-180 min;

and 5: injecting the clear and transparent solution obtained in the step 4 into an anhydrous toluene solution preheated to 60 ℃ in magnetic stirring by using a liquid-transferring gun, wherein the volume ratio of the clear and transparent solution to the anhydrous toluene solution is 1: 10;

step 6: centrifuging the mixed solution obtained in the step (5) at the speed of 4000rpm for 20-30 seconds, taking the precipitate after the centrifugation is finished, and adding a toluene solvent to fully dissolve the precipitate;

and 7: after the toluene mixed solution in the step 6 is uniformly shaken, centrifuging at 8000rpm for 20-30min, and taking the supernatant as the perovskite quantum dot solution;

and 8: taking two distributed Bragg reflector lenses with the area of 2cm by 2cm, and sequentially cleaning the two distributed Bragg reflector lenses by using anhydrous N, N-dimethylformamide and anhydrous ethanol;

and step 9: taking out a cleaned distributed Bragg reflector lens, heating to 60 ℃, and dropwise adding perovskite quantum dot solution on the surface of the lens in an amount of 3-12uL/cm²Uniformly coating an optical adhesive on one surface of the other distributed Bragg reflector lens, and vertically covering the optical adhesive on the perovskite quantum dot solution to form a sandwich structure of the distributed Bragg reflector lens-the perovskite quantum dot solution-the distributed Bragg reflector lens;

step 10: curing the optical adhesive: uniformly coating optical adhesive on the periphery of the sandwich structure to wrap the periphery of the sandwich structure; and preparing the room-temperature perovskite quantum dot vertical cavity surface emitting laser.

The room-temperature perovskite quantum dot vertical cavity surface emitting laser manufactured by the method.

The method for preparing the vertical cavity surface emitting laser can adjust the band gap by changing the type of the halogen, so that the emitting wavelength of the laser can be adjusted, and the full coverage of the optical band is realized.

The invention provides the vertical cavity surface emitting laser prepared by the method. The vertical cavity surface emitting laser provided by the invention has good stability and high luminous performance, can realize the lasing of low-threshold pulse optical pumping at room temperature, and has the threshold value as low as 53.28uJ/cm under the condition of pulse laser pumping at room temperature²。

Drawings

FIG. 1 is a schematic structural diagram of a VCSEL of the present invention;

FIG. 2 shows CsPbBr prepared by the present invention₃XRD pattern of quantum dot film;

FIG. 3 shows CsPbBr prepared by the present invention₃A TEM image of the quantum dot film;

FIG. 4 shows CsPbBr prepared by the present invention₃The luminescence spectrum and the absorption spectrum of the quantum dot film in a free space;

FIG. 5 is a schematic representation of the CsPbBr prepared₃Non-linear variation curve of quantum dot vertical cavity surface emitting laser.

Detailed Description

Referring to FIGS. 1 and 3, the present invention includes an inorganic perovskite CsPbBr₃Preparing quantum dot solution and processing the distributed Bragg reflector.

The preparation method of the room-temperature perovskite quantum dot vertical cavity surface emitting laser comprises the following steps:

step 1: PbBr₂Adding the powder into anhydrous N, N-dimethylformamide, magnetically stirring for 5-10 min at 500r/min to PbBr₂Dissolving the powder; wherein PbBr₂The molar concentration of the N, N-dimethylformamide is 0.04 mol/L;

step 2: dripping oleylamine into the mixed solution in the step 1, wherein the volume ratio of the oleylamine to the N, N-dimethylformamide is 1:100, magnetically stirring for 1-2 min at the rotating speed of 500 r/min;

and step 3: dripping oleic acid into the mixed solution in the step 2, wherein the volume ratio of the oleic acid to the N, N-dimethylformamide is 1:10, magnetically stirring for 1-2 min at the rotating speed of 500 r/min;

and 4, step 4: adding CsBr powder into the mixed solution in the step 3, wherein CsBr and PbBr are added₂The molar ratio of the mixture is 1:1, and the mixture is magnetically stirred until the mixed solution is clear and transparent, wherein the time is 120-180 min;

and 5: quickly injecting the clear and transparent solution obtained in the step (4) into an anhydrous toluene solution preheated to 60 ℃ in magnetic stirring, wherein the volume ratio of the clear and transparent solution to the anhydrous toluene solution is 1: 10;

step 6: centrifuging the mixed solution obtained in the step (5) at the speed of 4000rpm for 20-30 seconds, taking the precipitate after the centrifugation is finished, and adding a toluene solvent to fully dissolve the precipitate;

and 7: after the toluene mixed solution in the step 6 is uniformly shaken, centrifuging at 8000rpm for 20-30min, and taking the supernatant as the perovskite quantum dot solution;

and 8: taking two distributed Bragg reflector lenses with the area of 2cm by 2cm, and sequentially cleaning the two distributed Bragg reflector lenses by using anhydrous N, N-dimethylformamide and anhydrous ethanol;

and step 9: taking out a cleaned distributed Bragg reflector lens, heating to 60 ℃, and dropwise adding perovskite quantum dot solution on the surface of the lens in an amount of 3-12uL/cm²One surface of the other distributed Bragg reflector is uniformCoating an optical adhesive agent, and vertically covering the perovskite quantum dot solution to form a sandwich structure of a distributed Bragg reflector lens-the perovskite quantum dot solution-the distributed Bragg reflector lens;

step 10: curing the optical adhesive: uniformly coating optical adhesive on the periphery of the sandwich structure to wrap the periphery of the sandwich structure; and preparing the room-temperature perovskite quantum dot vertical cavity surface emitting laser.