WO2019080925A1

WO2019080925A1 - Continuous laser employing colloidal quantum dot and manufacturing method thereof

Info

Publication number: WO2019080925A1
Application number: PCT/CN2018/112081
Authority: WO
Inventors: 钟海政; 王雷
Original assignee: 北京理工大学
Priority date: 2017-10-27
Filing date: 2018-10-26
Publication date: 2019-05-02

Abstract

The present invention relates to a continuous laser employing colloidal quantum dots and a manufacturing method thereof. The manufacturing method of the continuous laser employing colloidal quantum dots comprises: manufacturing, on a corresponding surface of a resonant cavity, a composite luminescent film consisting of a perovskite quantum dot material and a polymer to serve as a gain medium of a continuous laser. The continuous laser employing colloidal quantum dots comprises a pump source, a gain medium and a resonant cavity, wherein the gain medium is a composite luminescent film consisting of a perovskite quantum dot material and a polymer and formed on a corresponding surface of the resonant cavity.

Description

Colloidal quantum dot continuous laser and preparation method thereof

This application claims to have the Chinese patent application CN 201711027617.2 filed on October 27, 2017 entitled "Colloid Quantum Dot Continuous Laser and Its Preparation Method", and the name "Colloid Quantum Dot Continuous Laser" and its application dated January 31, 2018. The Chinese patent application CN 201810097338.1, prepared by the Chinese patent application, entitled "LED-pumped perovskite quantum dot continuous laser" submitted on January 31, 2018, and the Chinese patent application CN 201810097315.0 submitted on January 31, 2018 The priority of the "LED-pumped perovskite quantum dot continuous laser and its preparation method" is the priority of the Chinese patent application CN 201810095572.0, which is incorporated herein in its entirety by reference.

Technical field

The invention relates to the field of laser technology, in particular to a colloidal quantum dot continuous laser and a preparation method thereof, and an LED-pumped perovskite quantum dot continuous laser.

Background technique

Semiconductor continuous lasers have important application value in the fields of laser display, laser illumination, laser medical, material processing, and communication. However, the current commercial semiconductor continuous lasers require high vacuum and high temperature in preparation, high fabrication costs, and complicated processing techniques. Semiconductor continuous lasers cannot be made flexible due to the epitaxial growth method.

The continuous laser prepared by the solution method has the advantages of simple preparation process and low price. The laser can be prepared by spin coating, inkjet printing, etc., and can form a flexible device on a flexible substrate, which has great practical application value. Colloidal quantum dot materials have the characteristics of solution preparation, high luminous efficiency and color adjustment, and are an important laser gain material. Most of the existing colloidal quantum dot lasers need to use femtosecond, picosecond or nanosecond lasers as the pump source. The laser emission of colloidal quantum dots can only be maintained in the femtosecond or nanosecond time region, which limits the colloidal quantum dot laser. Practical application. The development of colloidal quantum dot continuous lasers that can be continuously pumped has important application value.

At present, researchers are still in the early stages of research on continuous pumping and continuous pumping of colloidal quantum dot lasers. In quasi-continuous pumping: In 2013, Nurmikko et al. of Brown University in the United States used colloidal CdSe/Zn _0.5 Cd _0.5 S core-shell quantum dots as the gain medium, and used a laser with a pulse width of 270 ps as the pump source. Continuous pumping of quantum dot lasers; in 2014, Sun Handong of Nanyang Technological University and others reported the quasi-continuous blue liquid laser of CdZnS/ZnS ternary alloy quantum dot solution; in 2015, Adachi et al. of the University of Toronto, Canada discovered quantum dot lasers. The main reason why the pulse time can only be maintained for a length of ns is heat dissipation. In terms of continuous pumping: In 2016, Pandey et al. of the Indian University of Science and Technology studied continuous laser lasing using novel ternary ZnTe/ZnSe/CdZnS and ZnTeSe/ZnSe/CdZnS core/multilayer shell structure colloidal quantum dot materials; Sargent et al. at the University of Toronto studied continuous laser lasing of CdSe/CdS core-shell structures with biaxial stress; in 2017, Chien et al. in Taiwan reported the structure of SiO ₂ -CdSe/ZnS-SiO ₂ sandwich discs. Continuous laser pumping.

In the preparation process of the existing colloidal quantum dot continuous laser, the II-VI quantum dot materials such as CdSe and CdS are mostly used in the gain medium, and the materials need high temperature and complicated process.

In addition, existing colloidal quantum dot lasers require the use of femtosecond, nanosecond lasers or continuous lasers as pump sources. The pump source is bulky and expensive, which greatly limits the practical application of colloidal quantum dot lasers. The acquisition of colloidal quantum dot continuous lasers with electric pumping or small LED pumping has great difficulties. The development of colloidal quantum dot continuous lasers that can be pumped or LED pumped is the forefront of current quantum dot material laser applications.

Summary of the invention

Perovskite quantum dot material is an excellent luminescent material, which has the advantages of simple preparation process, low cost, high luminous efficiency, and narrow half-peak width. More importantly, the perovskite quantum dot optical film can be prepared in situ. By controlling the crystallization process of the perovskite material and the polymer, a quantum dot/polymer composite optical film having high fluorescence efficiency can be obtained. Compared with traditional quantum dot optical films, perovskite quantum dot optical films have the advantages of in-situ preparation, simple process, easy batch preparation and integrated application.

In view of the above, the present invention firstly provides a colloidal quantum dot continuous laser and a preparation method thereof, which are prepared as a continuous light-emitting film composed of a perovskite quantum dot material and a polymer on a corresponding surface of a resonant cavity. The gain medium of the laser. Secondly, the present invention innovatively uses a composite luminescent film composed of a perovskite quantum dot material and a polymer having a micro/nano optical structure as a gain medium and a resonant cavity of a continuous laser. In addition, the present invention innovatively uses a light-emitting diode as a pump source to excite a composite light-emitting film composed of a perovskite quantum dot material and a polymer, and is amplified by a cavity to output a continuous laser. Compared with the existing continuous laser technology, the laser provided by the invention has the advantages of a solution preparation method, a simple preparation process, a flexible device, an easy integration application, and low cost.

According to an aspect of the present invention, a method for preparing a colloidal quantum dot continuous laser includes: preparing a composite luminescent film composed of a perovskite quantum dot material and a polymer as the continuous on a corresponding surface of a resonant cavity The gain medium of the laser.

Preferably, the composite luminescent film is prepared by an in-situ method comprising: uniformly mixing a quantum dot precursor solution with a polymer solution to form a solution of a quantum dot precursor and a polymer; by spin coating Transferring, casting, or electrospinning, transferring the solution of the quantum dot precursor and the polymer to a corresponding surface of the resonant cavity; and evaporating the solvent by drying to a corresponding surface of the resonant cavity The composite luminescent film is formed.

Preferably, uniformly mixing the quantum dot precursor solution with the polymer solution to form a solution of the quantum dot precursor and the polymer comprises: dissolving the polymer in an organic solvent, adding the additive after the polymer is completely dissolved, and uniformly mixing, Obtaining the polymer solution; mixing the inorganic halide salt with the organic ammonium halide salt powder, adding an organic solvent, and uniformly mixing to obtain the quantum dot precursor solution; and the polymer solution and the quantum dot precursor solution Mixing to obtain a homogeneously mixed quantum dot precursor and polymer solution.

Preferably, the organic solvent is N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), trimethyl phosphate (TMP), triethyl phosphate (TEP), N-A Any one of a pyrrolidone (NMP) and a dimethylacetamide (DMAc); the additive is polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG); the inorganic halide salt is a metal Ge, Sn, Any one of a halide salt of Pb, Sb, Bi, Cu, and Mn; the organic amine halide salt is a saturated alkylamine halide salt of the formula C _n H _2n+1 NB ₃ wherein n ≥ 1, B is any one of Cl, Br and I, or an unsaturated alkylamine halide or aromatic amine halide of the formula C _n H _2n-1 NB ₃ wherein n ≥ 2 and B is Cl, Br and I Any of them.

Preferably, the perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX ₃ and/or A ₂ BX ₆ and/or AB ₂ X ₅ and/or A ₄ BX ₆ and/or A ₃ B ₂ X ₉ , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion.

Preferably, A is Rb ⁺ , Cs ⁺ , Na ⁺ , K ⁺ , Li ⁺ , NH=C(NH ₂ ) ₂ H ⁺ , NH=CRNH ₃ ⁺ or RNH ₃ ⁺ , wherein R is a chain carbon number of 1 a saturated linear or branched alkyl group of -8, an unsaturated straight or branched alkyl group or an aromatic group; B is Pb ²⁺ , Sn ²⁺ , Mn ²⁺ , Ge ²⁺ , In ^{3 +} , Sb ³⁺ , Bi ³⁺ or Cu ²⁺ , and X is at least one of F ^- , Cl ^- , Br ^- , I ^- , CN ^- and SCN ^- .

Preferably, the polymer is a transparent polymer that is soluble in a polar organic solvent.

Preferably, the polymer is selected from the group consisting of polyvinylidene fluoride, cellulose acetate, cyano cellulose, polyacrylonitrile, vinylidene fluoride-trifluoroethylene copolymer, urethane rubber, polystyrene, and polyethylene terephthalate. At least one of a glycol ester, a polycarbonate, a cellulose triacetate, a polymethyl acrylate, a styrene-acrylonitrile copolymer, polyethylene naphthalate, polyether sulfone, and polyvinyl chloride.

Preferably, the polymer is selected from at least one of polyvinylidene fluoride, cellulose acetate, cyano cellulose, polyacrylonitrile, vinylidene fluoride-trifluoroethylene copolymer, and cellulose triacetate.

According to another aspect of the present invention, a colloidal quantum dot continuous laser is provided, comprising: a pump source, a gain medium, and a resonant cavity, wherein the gain medium is a titanium-titanium on a corresponding surface of the resonant cavity A composite luminescent film composed of a mineral quantum dot material and a polymer.

Preferably, the resonant cavity is made of a flexible material.

Preferably, by varying the composition or size of the perovskite quantum dot material, the emission wavelength of the continuous laser output from the colloidal quantum dot continuous laser is continuously adjustable from 400 nm to 800 nm.

Preferably, the wavelength of action of the resonant cavity matches the wavelength of illumination of the gain medium.

Preferably, the resonant cavity comprises a distributed Bragg mirror and a distributed feedback structure, wherein when the resonant cavity is a distributed Bragg mirror, the gain medium is formed in two mirrors having different reflectivities The gain medium is formed on a light receiving surface of the distributed feedback structure when the resonant cavity is a distributed feedback structure.

Preferably, the pump source is a continuous laser comprising a semiconductor laser, a gas laser, and a fiber laser.

Preferably, the perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX ₃ and/or A ₂ BX ₆ and/or AB ₂ X ₅ and/or A ₄ BX ₆ and/or A ₃ B ₂ X ₉ , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion; the polymer is soluble in polar organic A transparent polymer of solvent.

Preferably, the colloidal quantum dot continuous laser further comprises: a lens disposed between the pump source and the resonant cavity for concentrating light emitted by the pump source.

According to still another aspect of the present invention, a method for preparing a colloidal quantum dot continuous laser includes: preparing a composite light-emitting film composed of a perovskite quantum dot material and a polymer; and forming a micro-nano on the composite light-emitting film An optical structure; and the composite luminescent film having a micro/nano optical structure as a gain medium and a resonant cavity of the continuous laser.

Preferably, preparing the micro/nano optical structure on the composite luminescent film comprises: forming a photonic crystal structure or a grating structure on the composite luminescent film by nanoimprinting or etching.

Preferably, the composite luminescent film is prepared by an in-situ method comprising: transferring a solution of a perovskite quantum dot precursor and a polymer to the solution by spin coating, spraying, casting or electrospinning to On the substrate; and by drying, the solvent is evaporated to form the composite luminescent film on the substrate.

Preferably, the substrate is a rigid substrate or a flexible substrate selected from the group consisting of glass and silicon wafers selected from the group consisting of plastics, metal foils, ultra-thin glass, paper substrates, and biological materials. A group of composite film substrates.

Preferably, the composite luminescent film is separable from the substrate.

According to still another aspect of the present invention, a colloidal quantum dot continuous laser is provided, comprising: a pump source, a gain medium, and a resonant cavity, wherein the gain medium and the resonant cavity are perovskites having a micro/nano optical structure A composite luminescent film composed of a quantum dot material and a polymer.

Preferably, the micro/nano optical structure comprises a photonic crystal structure and a grating structure.

Preferably, the emission wavelength of the colloidal quantum dot continuous laser is continuously adjustable in the range of 400 nm to 800 nm by changing the composition or size of the perovskite quantum dot material.

According to still another aspect of the present invention, there is provided an LED pumped colloidal quantum dot continuous laser comprising a pump source, a gain medium and a resonant cavity, wherein the pump source is for exciting the gain medium, The gain medium is a composite luminescent film composed of a perovskite quantum dot material and a polymer for receiving radiation of the pump source to excite photons for amplifying photons excited by the gain medium for output A continuous laser, wherein the pump source is a light emitting diode LED.

Preferably, the LED is any one selected from the group consisting of: a semiconductor light emitting diode; an organic light emitting diode OLED; a quantum dot light emitting diode QLED; a micro light emitting diode Micro-LED, the micro-LED being on a chip An integrated high-density micro-sized LED array; and a perovskite light-emitting diode whose luminescent material is an organic/inorganic hybrid perovskite or an inorganic perovskite material.

Preferably, the OLED comprises a small molecule organic electroluminescent device and a high molecular organic electroluminescent device; the quantum dot material of the QLED comprises a II-VI quantum dot, a III-V quantum dot, and an I-III-VI Family quantum dots and perovskite quantum dots.

Preferably, the resonant cavity comprises a distributed Bragg mirror and a distributed feedback structure, wherein when the resonant cavity is a distributed Bragg mirror, the gain medium is formed in two mirrors having different reflectivities When the resonant cavity is a distributed feedback structure, the gain medium is formed on a light receiving surface of the distributed feedback structure, and the gain medium has a photonic crystal structure or a grating structure.

Preferably, when the resonant cavity is a distributed feedback structure, the gain medium having a photonic crystal structure or a grating structure is attached to the light emitting surface of the LED to form an integrated device.

Preferably, the laser emission wavelength of the perovskite quantum dot continuous laser is continuously adjustable in the range of 400 nm to 800 nm by changing the composition or size of the perovskite quantum dot material.

Preferably, the resonant cavity is a photonic crystal structure or a grating structure formed on a light exiting surface of the LED, and the gain medium is located on the photonic crystal structure or the grating structure.

Preferably, the light-emitting surface of the LED comprises a rigid transparent material selected from the group consisting of glass and ITO glass.

Preferably, the light exiting surface of the LED comprises a flexible transparent material selected from the group consisting of plastic, metal foil, ultra-thin glass, paper substrate and biocomposite film substrate.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention may be realized and obtained by means of the structure particularly pointed in the appended claims.

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. The drawings are merely schematic and exemplary and are not drawn to scale.

1 is a partial schematic view of a colloidal quantum dot continuous laser in accordance with a first embodiment of the present invention.

2 is a partial schematic view of a colloidal quantum dot continuous laser in accordance with a second embodiment of the present invention.

3 is a schematic diagram of a colloidal quantum dot continuous laser in accordance with a third embodiment of the present invention.

Fig. 4 exemplarily shows a multimode laser spectrum observed using the colloidal quantum dot continuous laser shown in Fig. 3.

Figure 5 is a schematic illustration of a composite luminescent film in accordance with a fourth embodiment of the present invention.

Fig. 6 is a schematic view of a composite luminescent film after separation from a substrate.

Figure 7 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a fifth embodiment of the present invention.

Figure 8 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a sixth embodiment of the present invention.

Figure 9 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a seventh embodiment of the present invention.

Figure 10 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with an eighth embodiment of the present invention.

Figure 11 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a ninth embodiment of the present invention.

Figure 12 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a tenth embodiment of the present invention.

Figure 13 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with an eleventh embodiment of the present invention.

Figure 14 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a twelfth embodiment of the present invention.

Figure 15 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a thirteenth embodiment of the present invention.

Figure 16 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a fourteenth embodiment of the present invention.

Fig. 17 exemplarily shows a spectrum of a multimode continuous laser outputted by the laser shown in Fig. 13 when an input current of 350 mA is applied.

Figure 18 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a fifteenth embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, in which the present invention can be applied to the technical problems, and the implementation of the technical effects can be fully understood and implemented. It should be noted that the various embodiments of the present invention and the various features of the various embodiments may be combined with each other, and the technical solutions formed are all within the scope of the present invention.

In the following description, numerous specific details are set forth However, it will be apparent to those skilled in the art that the invention may be

1 is a partial schematic view of a colloidal quantum dot continuous laser in accordance with a first embodiment of the present invention. As shown in FIG. 1, in the embodiment, the colloidal quantum dot continuous laser includes: a gain medium 101 for receiving continuous laser radiation to excite photons; and a resonant cavity 102 for amplifying photons excited by the gain medium 101. A continuous laser is output, wherein the gain medium 101 is a composite luminescent film composed of a perovskite quantum dot material and a polymer prepared by an in-situ method on a corresponding surface of the resonant cavity 102.

The in-situ method comprises: uniformly mixing a quantum dot precursor solution with a polymer solution to form a solution of a quantum dot precursor and a polymer; and quantum dot precursor and polymerization by spin coating, spraying, casting or electrospinning The solution of the substance is transferred to the corresponding surface of the cavity; and by drying, the solvent is evaporated to form the composite luminescent film on the corresponding surface of the cavity.

The method of uniformly mixing the quantum dot precursor solution with the polymer solution to form the quantum dot precursor and the polymer comprises: dissolving the polymer in an organic solvent, adding the additive after the polymer is completely dissolved, and uniformly mixing, to obtain the a polymer solution; mixing an inorganic halide salt with an organic ammonium halide salt powder, adding an organic solvent, and uniformly mixing to obtain the quantum dot precursor solution; mixing the polymer solution and the quantum dot precursor solution to obtain The quantum dot precursor and the polymer solution are uniformly mixed.

The organic solvent is N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), trimethyl phosphate (TMP), triethyl phosphate (TEP), N-methylpyrrolidone ( Any one of NMP) and dimethylacetamide (DMAc); the additive is polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG); the inorganic halide salt is metal Ge, Sn, Pb, Sb Any one of a halide salt of Bi, Cu and Mn; the organic amine halide salt is a saturated alkylamine halide salt of the formula C _n H _2n+1 NB ₃ wherein n ≥ 1 and B is Cl Any of Br, I, or an unsaturated alkylamine halide or an aromatic amine halide of the formula C _n H _2n-1 NB ₃ wherein n ≥ 2, and B is any of Cl, Br and I One.

The perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX ₃ and/or A ₂ BX ₆ and/or AB ₂ X ₅ and/or A ₄ BX. ₆ and/or A ₃ B ₂ X ₉ , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion. Preferably, A is Rb ⁺ , Cs ⁺ , Na ⁺ , K ⁺ , Li ⁺ , NH=C(NH ₂ ) ₂ H ⁺ , NH=CRNH ₃ ⁺ or RNH ₃ ⁺ , wherein R is a chain carbon number of 1 a saturated linear or branched alkyl group of -8, an unsaturated straight or branched alkyl group or an aromatic group, and B is Pb ²⁺ , Sn ²⁺ , Mn ²⁺ , Ge ²⁺ , In ^{3 +} , Sb ³⁺ , Bi ³⁺ or Cu ²⁺ , and X is at least one of F ^- , Cl ^- , Br ^- , I ^- , CN ^- and SCN ^- .

The polymer is a transparent polymer that is soluble in a polar organic solvent. Preferably, the polymer is selected from the group consisting of polyvinylidene fluoride, cellulose acetate, cyano cellulose, polyacrylonitrile, vinylidene fluoride-trifluoroethylene copolymer, urethane rubber, polystyrene, and polyethylene terephthalate. At least one of a glycol ester, a polycarbonate, a cellulose triacetate, a polymethyl acrylate, a styrene-acrylonitrile copolymer, polyethylene naphthalate, polyether sulfone, and polyvinyl chloride. More preferably, the polymer is selected from at least one of polyvinylidene fluoride, cellulose acetate, cyano cellulose, polyacrylonitrile, vinylidene fluoride-trifluoroethylene copolymer, and cellulose triacetate.

By varying the composition or size of the perovskite quantum dot material, the emission wavelength of the continuous laser output from the colloidal quantum dot continuous laser is continuously adjustable from 400 nm to 800 nm.

The wavelength of action of the resonant cavity 102 can be matched to the wavelength of the light of the gain medium 101. The resonant cavity 102 can be made of a hard material or a flexible material. The colloidal quantum dot continuous laser has flexibility if the resonant cavity 102 is made of a flexible material. The flexible material may be plastic, metal foil, ultra-thin glass, paper substrate, biocomposite film substrate, and the like.

In the first embodiment, the resonant cavity 102 is a distributed Bragg Reflection (DBR) composed of two distributed Bragg mirrors having different reflectivities, wherein the gain medium 101 is formed in two mirrors. between.

2 is a partial schematic view of a colloidal quantum dot continuous laser in accordance with a second embodiment of the present invention. As shown in FIG. 2, unlike the first embodiment, in the second embodiment, the resonant cavity 202 is a distributed feedback (DFB) structure in which the gain medium 201 is formed on its light receiving surface.

Other aspects of the second embodiment may be the same as those of the first embodiment, and are not described herein.

3 is a schematic diagram of a colloidal quantum dot continuous laser in accordance with a third embodiment of the present invention. As shown in FIG. 3, the colloidal quantum dot continuous laser includes: a pump source 301 for exciting a gain medium to excite a photon to emit photons; a lens 302 for converging the continuous laser light emitted by the pump source 301; and a gain medium 303 For receiving the radiation of the pump source 301 to excite photons; the cavity 304 for amplifying the photons excited by the gain medium to output a continuous laser.

In the present embodiment, the pump source 301 is a continuous laser, which may be, for example, a semiconductor laser, a gas laser, and a fiber laser. Resonator cavity 304 is a distributed Bragg mirror. Gain medium 303 is formed between two mirrors having different reflectivities.

Other aspects of the third embodiment may be the same as those of the first embodiment, and are not described herein.

Fig. 4 exemplarily shows a multimode laser spectrum observed using the colloidal quantum dot continuous laser shown in Fig. 3. In this example, the excitation wavelength of the semiconductor laser is 405 nm, and the solution of the quantum dot precursor and the polymer is combined with DBR by a spin coating method, and after drying, a composite light-emitting film is formed on the surface of the DBR as a laser gain medium. The colloidal quantum dot continuous laser 303 of the DBR structure outputs a multimode continuous laser having a wavelength of 510 nm to 555 nm after being stimulated. By reducing the DBR cavity length, the number of laser modes can be reduced. By varying the composition of the quantum dot material or the size of the quantum dot material, continuous lasers of different wavelengths can be obtained. For example, for R ₁ NH ₃ AB ₃ or (R ₂ NH ₃ ) ₂ AB ₄ perovskite materials, B is any one or a mixture of Cl, Br, and I, and can be realized by changing component B. The emission wavelength is continuously adjusted from 400 nm to 800 nm. Alternatively, by increasing the particle diameter of the quantum dot material, the emission wavelength gradually shifts toward the long wavelength direction.

Figure 5 is a schematic illustration of a composite luminescent film in accordance with a fourth embodiment of the present invention. In the present embodiment, the composite luminescent film 502 is a composite luminescent film composed of a perovskite quantum dot material and a polymer having a micro/nano optical structure 503. As shown in FIG. 5, in the present embodiment, the composite light-emitting film 502 is formed on a substrate 501 on which a micro/nano optical structure 503 is formed.

In the present embodiment, the composite luminescent film 502 is prepared by an in-situ method. The in-situ method comprises: transferring a solution of a perovskite quantum dot precursor and a polymer onto a substrate 501 by spin coating, spraying, casting or electrospinning; and drying the solvent to evaporate the solvent to the substrate The composite luminescent film 502 is formed on 501. Then, a micro/nano optical structure 503, such as a photonic crystal structure and a grating structure, is formed on the composite light-emitting film 502 by nanoimprinting, etching, or the like. The grating structure can for example be a Bragg grating.

The substrate 501 may be a rigid substrate or a flexible substrate. The rigid substrate is selected from the group consisting of glass and silicon wafers. The flexible substrate is selected from the group consisting of plastics, metal foils, ultra-thin glass, paper substrates, and biocomposite film substrates. In the case where the substrate 501 is a flexible substrate, the composite luminescent film can be bent and has flexibility. The composite luminescent film 502 is separable from the substrate 501.

Fig. 6 is a schematic view of a composite luminescent film after separation from a substrate. As shown in FIG. 6, a composite nano luminescent film 602 is formed with a micro/nano optical structure 603, such as a photonic crystal structure or a grating structure.

Figure 7 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a fifth embodiment of the present invention. As shown in FIG. 7, in the present embodiment, the colloidal quantum dot continuous laser includes: a pump source 700 for exciting the gain medium; and a composite light-emitting film 702 as a gain medium and a resonant cavity, which is composed of a perovskite quantum dot. The material is constructed of a polymer and has a micro/nano optical structure 703. The micro/nano optical structure 703 can be a photonic crystal structure or a grating structure. The grating structure is, for example, a Bragg grating.

The laser light emitted from the pump source 700 can excite the composite light-emitting film 702. After the composite light-emitting film 702 is excited, the photon is emitted, and then amplified by the micro/nano optical structure 703 on the composite light-emitting film 702 to output a continuous laser.

In the embodiment shown in FIG. 7, a composite light-emitting film 702 is formed on a substrate 701 similarly to the embodiment shown in FIG.

The pump source 700 can be a continuous laser having a laser wavelength that is less than the laser wavelength of the colloidal quantum dot continuous laser. The continuous laser is selected from the group consisting of a semiconductor laser, a gas laser, and a fiber laser. The semiconductor laser includes a laser diode or the like.

The emission wavelength of the colloidal quantum dot continuous laser is continuously adjustable from 400 nm to 800 nm by changing the composition or size of the perovskite quantum dot material and selecting the micro/nano optical structure whose wavelength is matched with the emission wavelength of the quantum dot material. .

Figure 8 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a sixth embodiment of the present invention. As shown in FIG. 8, in the present embodiment, the colloidal quantum dot continuous laser includes: a pump source 800 for exciting the gain medium; and a composite light-emitting film 802 which serves as both a gain medium and a resonant cavity, which is made of calcium. The titanium ore quantum dot material is composed of a polymer and has a micro/nano optical structure 803. The micro/nano optical structure 803 can be a photonic crystal structure or a grating structure. The grating structure is, for example, a Bragg grating. A composite luminescent film 802 is formed on the substrate 801.

Different from the embodiment shown in FIG. 7, the colloidal quantum dot continuous laser shown in FIG. 8 further includes a lens 804 disposed between the pump source 800 and the composite light-emitting film 802 for the emission of the concentrated pump source 800. Light.

Lens 804 can be an optical lens or a microlens or microlens array.

The laser light emitted from the pump source 800 is concentrated by the lens 804 to excite the composite light-emitting film 802. After the composite light-emitting film 802 is excited, the photon is emitted, and then amplified by the micro/nano optical structure 803 on the composite light-emitting film 802 to output a continuous laser.

Figure 9 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a seventh embodiment of the present invention. As shown in FIG. 9, in the present embodiment, the colloidal quantum dot continuous laser includes: a pump source 900 for exciting the gain medium; and a composite light-emitting film 902 as a gain medium and a resonant cavity, which is composed of a perovskite quantum dot. The material is constructed of a polymer and has a micro/nano optical structure 903. The micro/nano optical structure 903 can be a photonic crystal structure or a grating structure. The grating structure is, for example, a Bragg grating. A composite luminescent film 902 is formed on the substrate 901.

Unlike the embodiment shown in FIG. 7, the pump source 900 of the colloidal quantum dot continuous laser shown in FIG. 9 is a light emitting diode (LED) that is energized by a current I.

The LED may be: a semiconductor light emitting diode whose illuminating center is composed of a compound of gallium, arsenic, phosphorus, nitrogen, indium or aluminum; an organic light emitting diode OLED using an organic polymeric material as a luminescent center; and a quantum dot using a quantum dot material as a luminescent center Light-emitting diode QLED; micro-light-emitting diode Micro-LED, which is a high-density micro-sized LED array integrated on a chip; and a perovskite light-emitting diode whose luminescent material is an organic/inorganic hybrid perovskite or inorganic calcium Titanium ore materials, etc.

The OLED includes a small molecule organic electroluminescent device, a high molecular organic electroluminescent device, and the like.

The quantum dot materials of the QLED include II-VI quantum dots, III-V quantum dots, I-III-VI quantum dots, and perovskite quantum dots.

The wavelength of light emitted by the LED is less than the wavelength of the laser of the colloidal quantum dot continuous laser.

Since LEDs are less expensive and more readily available than continuous lasers, the use of LEDs as pump sources is more advantageous in terms of fabrication costs and fabrication processes.

Figure 10 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with an eighth embodiment of the present invention. The embodiment of FIG. 10 is different from the embodiment of FIG. 9 in that, in the embodiment of FIG. 10, the colloidal quantum dot continuous laser further includes a lens 1004 disposed between the pump source 1000 and the composite light-emitting film 1002. The light emitted by the pump source 1000 is concentrated.

Lens 1004 can be an optical lens or a microlens or microlens array. In an embodiment, the lens 1004 can be attached to the light exit surface of the pump source 1000.

Figure 11 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a ninth embodiment of the present invention. The embodiment of Figure 11 differs from the embodiment of Figure 9 in that the composite luminescent film 1102 has been separated from the substrate and the composite luminescent film 1102 is directly attached to the light exiting surface of the pump source 1100 to form an integrated device.

Figure 12 is a schematic illustration of a colloidal quantum dot continuous laser in accordance with a tenth embodiment of the present invention. The embodiment of FIG. 12 differs from the embodiment of FIG. 11 in that the colloidal quantum dot continuous laser further includes a lens 1204 disposed between the pump source 1200 and the composite luminescent film 1202 for concentrating the pump source 1200 to emit. Light. Composite luminescent film 1202 is attached to lens 1204 to form an integrated device.

Lens 1204 can be an optical lens or a microlens or microlens array. In an embodiment, the lens 1204 can be attached to the light exit surface of the pump source 1200.

Figure 13 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with an eleventh embodiment of the present invention. As shown in FIG. 13, in the present embodiment, the perovskite quantum dot continuous laser includes: a pump source 1301 for exciting the gain medium to excite the gain medium to emit photons; and a gain medium 1302 for receiving the pump source 1301. The radiation excites the photons; the cavity 1303 is for amplifying the photons excited by the gain medium to output a continuous laser.

In the present embodiment, the pump source 1301 is a light emitting diode (LED) that is energized with a current I to emit light. The pump source 1301 emits light having a wavelength that is less than the emission wavelength of the continuous laser output from the perovskite quantum dot continuous laser.

In the present embodiment, the resonant cavity 1303 is a distributed Bragg reflector (DBR). Gain medium 1302 is formed between two mirrors having different reflectivities.

Figure 14 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a twelfth embodiment of the present invention. The embodiment of FIG. 14 differs from the embodiment of FIG. 13 in that the LED-pumped perovskite quantum dot continuous laser further includes a lens 1404 disposed between the pump source 1401 and the resonant cavity 1403 for convergence. Light emitted by pump source 1401.

Lens 1404 can be an optical lens or a microlens or microlens array. In an embodiment, the lens 1404 can be attached to the light exiting surface of the pump source 1401.

Figure 15 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a thirteenth embodiment of the present invention. The embodiment of Figure 15 differs from the embodiment of Figure 13 in that in an LED-pumped perovskite quantum dot continuous laser, the resonant cavity 1503 is a distributed feedback (DFB) structure.

In an embodiment, the gain medium 1502 can be formed on the light-receiving surface of the distributed feedback structure by an in-situ fabrication method.

In another embodiment, the resonant cavity 1503 can also be directly formed on the composite light-emitting film 1502 as a gain medium by forming a photonic crystal structure or a grating structure on the composite light-emitting film by nanoimprinting or etching, thereby Form a distributed feedback structure.

The resonant cavity 1503 can be made of a hard material or a flexible material. When the resonant cavity 1503 is made of a flexible material, the resonant cavity 1503 can be attached to the light exiting surface of the pumping source 1501 to form an integrated device.

Figure 16 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a fourteenth embodiment of the present invention. The embodiment of Figure 16 differs from the embodiment of Figure 15 in that the LED-pumped perovskite quantum dot continuous laser further includes a lens 1604 disposed between the pump source 1601 and the resonant cavity 1603 for convergence. Light emitted by pump source 1601.

Fig. 17 exemplarily shows a spectrum of a multimode continuous laser outputted by the laser shown in Fig. 13 when an input current of 350 mA is applied. As shown in FIG. 17, in this example, the pump source is a commercial indium gallium nitride violet LED chip having a center wavelength of 405 nm, a rated power of 1 W, a rated current of 350 mA, and an LED surface area of 45 mil*. 45mil (ie 1.143mm*1.143mm). The gain medium is a perovskite quantum dot/polymer composite luminescent film prepared by an in-situ method. The preparation method is that the quantum dot precursor/polymer solution is combined with DBR by a spin coating method, and after drying, a composite light-emitting film is formed on the surface of the DBR as a gain medium. Under the indium gallium nitride violet LED pumping, the DBR structure of the laser output multimode continuous laser with a wavelength of 480-565 nm. By reducing the cavity length of the DBR, the number of laser modes can be reduced. By varying the composition or size of the quantum dot material, continuous lasers of different wavelengths can be obtained.

Figure 18 is a schematic illustration of an LED-pumped perovskite quantum dot continuous laser in accordance with a fifteenth embodiment of the present invention. As shown in FIG. 18, in the present embodiment, the perovskite quantum dot continuous laser includes a pump source 1801, a resonant cavity 1802, and a gain medium 1803.

The pump source 1801 is an LED that is energized with a current I to excite the gain medium 1803 to emit photons. The resonant cavity 1802 is a photonic crystal structure or a grating structure formed on the light exiting surface of the LED for amplifying photons emitted by the gain medium 1803 to output a continuous laser light. The gain medium 1803 is a composite luminescent film composed of a perovskite quantum dot material and a polymer prepared on the photonic crystal structure or the grating structure for receiving light radiation of the LED to excite photons.

The LED may be a semiconductor light emitting diode, a micro light emitting diode (Micro-LED), an organic light emitting diode (OLED), a quantum dot light emitting diode (QLED), or a perovskite light emitting diode (Perovskite LED). The micro-light-emitting diodes are high-density, micro-sized LED arrays integrated on the chip. The organic light emitting diode uses an organic polymeric material as a luminescent center. Quantum dot LEDs use quantum dot materials as the center of illumination. The luminescent material of the perovskite light emitting diode is a perovskite material.

In an embodiment, the light emitting surface of the LED is a hard transparent material such as glass or ITO glass. In another embodiment, the light exiting surface of the LED is a flexible transparent material such as a plastic, a metal foil, an ultra-thin glass, a paper substrate, or a biocomposite film substrate.

In one embodiment, the photonic crystal structure or the grating structure is formed by imprinting or etching.

In one embodiment, the photonic crystal structure or grating structure is prepared directly on the light exit surface of the LED. In another embodiment, a photonic crystal structure or a grating structure may be prepared on the light emitting surface of the LED package cover, and then the LED is packaged by a package cover having a photonic crystal structure or a grating structure.

The present disclosure also relates to a method for preparing a colloidal quantum dot continuous laser, comprising: preparing a composite light-emitting film composed of a perovskite quantum dot material and a polymer as a gain medium of the continuous laser on a corresponding surface of the resonant cavity . The specific features of the method have been described in the foregoing description of the corresponding colloidal quantum dot continuous laser, and will not be described herein.

The present disclosure also relates to a method for preparing a colloidal quantum dot continuous laser, comprising: preparing a composite luminescent film composed of a perovskite quantum dot material and a polymer; forming a micro/nano optical structure on the composite luminescent film; The composite luminescent film having a micro/nano optical structure serves as a gain medium and a resonant cavity of the continuous laser. The specific features of the method have been described in the foregoing description of the corresponding colloidal quantum dot continuous laser, and will not be described herein.

In summary, the present invention first provides a colloidal quantum dot continuous laser and a method for fabricating the same, which prepare a composite luminescent film composed of a perovskite quantum dot material and a polymer on a corresponding surface of a resonant cavity. Gain medium for continuous lasers. Secondly, the present invention innovatively uses a composite luminescent film composed of a perovskite quantum dot material and a polymer having a micro/nano optical structure as a gain medium and a resonant cavity of a continuous laser. In addition, the present invention innovatively uses a light-emitting diode as a pump source to excite a composite light-emitting film composed of a perovskite quantum dot material and a polymer, and is amplified by a cavity to output a continuous laser. Compared with the existing continuous laser technology, the laser provided by the invention has the advantages of a solution preparation method, a simple preparation process, a flexible device, an easy integration application, and low cost.

It is understood that the disclosed embodiments of the invention are not limited to the specific process steps or materials disclosed herein, but should be extended to equivalents of those skilled in the art. It is also understood that the terminology used herein is for the purpose of the description

The "embodiment" referred to in the specification means that a specific feature, or characteristic, described in connection with the embodiment is included in at least one embodiment of the present invention. Therefore, phrases or "embodiments" that appear throughout the specification are not necessarily referring to the same embodiment.

Furthermore, the described features or characteristics may be combined in one or more embodiments in any other suitable manner. In the above description, some specific details are set forth, such as thickness, number, etc., to provide a comprehensive understanding of the embodiments of the invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of the specific details described above, or other methods, components, materials, and the like.

Although the above examples are intended to illustrate the principles of the invention in one or more applications, it will be apparent to those skilled in the art that Make various modifications to the details without giving up creative labor. Accordingly, the invention is defined by the appended claims.

Claims

A method for preparing a colloidal quantum dot continuous laser, comprising:

On the corresponding surface of the cavity, a composite luminescent film composed of a perovskite quantum dot material and a polymer is prepared as a gain medium of the continuous laser.
The method of preparing a colloidal quantum dot continuous laser according to claim 1, wherein the composite luminescent film is prepared by an in-situ method, and the in-situ method comprises:

The quantum dot precursor solution is uniformly mixed with the polymer solution to form a solution of the quantum dot precursor and the polymer;

Transferring the solution of the quantum dot precursor and polymer to a corresponding surface of the resonant cavity by spin coating, spraying, casting or electrospinning;

The solvent is evaporated by drying to form the composite luminescent film on the respective surfaces of the cavity.
The method for preparing a colloidal quantum dot continuous laser according to claim 2, wherein uniformly mixing the quantum dot precursor solution with the polymer solution to form a solution of the quantum dot precursor and the polymer comprises:

Dissolving the polymer in an organic solvent, after the polymer is completely dissolved, adding an additive, and uniformly mixing to obtain the polymer solution;

Mixing the inorganic halide salt with the organic ammonium halide salt powder, adding an organic solvent, and uniformly mixing to obtain the quantum dot precursor solution;

The polymer solution and the quantum dot precursor solution are mixed to obtain a uniformly mixed quantum dot precursor and a polymer solution.
The method of preparing a colloidal quantum dot continuous laser according to claim 3, wherein

The organic solvent is N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), trimethyl phosphate (TMP), triethyl phosphate (TEP), N-methylpyrrolidone ( Any one of NMP) and dimethylacetamide (DMAc);

The additive is polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG);

The inorganic halide salt is any one of halide salts of metal Ge, Sn, Pb, Sb, Bi, Cu and Mn;

The organic amine halide salt is a saturated alkylamine halide salt of the formula C n H 2n+1 NB 3 wherein n ≥ 1, B is any one of Cl, Br and I, or C n An unsaturated alkylamine halide salt or an aromatic amine halide salt of H 2n-1 NB 3 wherein n ≥ 2 and B is any one of Cl, Br and I.
The method for preparing a colloidal quantum dot continuous laser according to claim 1, wherein the perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot, and has a structural formula of ABX 3 and/or Or A 2 BX 6 and / or AB 2 X 5 and / or A 4 BX 6 and / or A 3 B 2 X 9 , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, X It is a halogen ion.
A method of fabricating a colloidal quantum dot continuous laser according to claim 5, wherein

A is Rb + , Cs + , Na + , K + , Li + , NH=C(NH 2 ) 2 H + , NH=CRNH 3 + or RNH 3 + , wherein R is a chain having 1-8 carbon atoms a saturated linear or branched alkyl group, an unsaturated straight or branched alkyl group or an aromatic group;

B is Pb 2+ , Sn 2+ , Mn 2+ , Ge 2+ , In 3+ , Sb 3+ , Bi 3+ or Cu 2+ , and X is F - , Cl - , Br - , I - , CN - And at least one of SCN - .
The method of producing a colloidal quantum dot continuous laser according to claim 1, wherein the polymer is a transparent polymer capable of being dissolved in a polar organic solvent.
The method for preparing a colloidal quantum dot continuous laser according to claim 7, wherein the polymer is selected from the group consisting of polyvinylidene fluoride, cellulose acetate, cyano cellulose, polyacrylonitrile, and vinylidene fluoride-trifluoroethylene copolymer. , urethane rubber, polystyrene, polyethylene terephthalate, polycarbonate, cellulose triacetate, polymethyl acrylate, styrene-acrylonitrile copolymer, polyethylene naphthalate, At least one of polyethersulfone and polyvinyl chloride.
The method for preparing a colloidal quantum dot continuous laser according to claim 8, wherein the polymer is selected from the group consisting of polyvinylidene fluoride, cellulose acetate, cyano cellulose, polyacrylonitrile, and vinylidene fluoride-trifluoroethylene copolymer. And at least one of cellulose triacetate.
A colloidal quantum dot continuous laser comprising: a pump source, a gain medium, and a resonant cavity, wherein

The gain medium is a composite luminescent film composed of a perovskite quantum dot material and a polymer on respective surfaces of the resonant cavity.
The colloidal quantum dot continuous laser of claim 10 wherein said resonant cavity is fabricated from a flexible material.
The colloidal quantum dot continuous laser according to claim 10, wherein the emission wavelength of the continuous laser output from the colloidal quantum dot continuous laser is continuously in the range of 400 nm to 800 nm by changing the composition or size of the perovskite quantum dot material. Adjustable.
The colloidal quantum dot continuous laser according to claim 10, wherein an active wavelength of said resonant cavity matches an emission wavelength of said gain medium.
The colloidal quantum dot continuous laser according to claim 10, wherein said resonant cavity comprises a distributed Bragg mirror and a distributed feedback structure, wherein

When the resonant cavity is a distributed Bragg mirror, the gain medium is formed between two mirrors having different reflectivities;

The gain medium is formed on a light receiving surface of the distributed feedback structure when the resonant cavity is a distributed feedback structure.
The colloidal quantum dot continuous laser according to claim 10, wherein said pump source is a continuous laser comprising a semiconductor laser, a gas laser, and a fiber laser.
The colloidal quantum dot continuous laser according to claim 10, wherein

The perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX 3 and/or A 2 BX 6 and/or AB 2 X 5 and/or A 4 BX. 6 and/or A 3 B 2 X 9 , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion;

The polymer is a transparent polymer that is soluble in a polar organic solvent.
The colloidal quantum dot continuous laser of claim 10 further comprising: a lens disposed between said pump source and said resonant cavity for concentrating light emitted by said pump source.
A method for preparing a colloidal quantum dot continuous laser, comprising:

Preparing a composite luminescent film composed of a perovskite quantum dot material and a polymer;

Forming a micro/nano optical structure on the composite luminescent film;

The composite luminescent film having a micro/nano optical structure is used as a gain medium and a resonant cavity of the continuous laser.
The method of preparing a colloidal quantum dot continuous laser according to claim 18, wherein preparing the micro/nano optical structure on the composite luminescent film comprises:

A photonic crystal structure or a grating structure is formed on the composite luminescent film by nanoimprinting or etching.
The method of preparing a colloidal quantum dot continuous laser according to claim 18, wherein the composite luminescent film is prepared by an in-situ method, and the in-situ method comprises:

Transferring a solution of the perovskite quantum dot precursor and the polymer to the substrate by spin coating, spraying, casting or electrospinning;

The solvent is evaporated by drying to form the composite luminescent film on the substrate.
The method of fabricating a colloidal quantum dot continuous laser according to claim 20, wherein the substrate is a rigid substrate or a flexible substrate, and the rigid substrate is selected from the group consisting of glass and silicon wafers, the flexible substrate being selected from the group consisting of plastics. , a group of metal foils, ultra-thin glass, paper substrates, and biocomposite film substrates.
The method of producing a colloidal quantum dot continuous laser according to claim 20, wherein said composite luminescent film is separable from said substrate.
The method of preparing a colloidal quantum dot continuous laser according to claim 18, wherein

The perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX 3 and/or A 2 BX 6 and/or AB 2 X 5 and/or A 4 BX. 6 and/or A 3 B 2 X 9 , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion;

The polymer is a transparent polymer that is soluble in a polar organic solvent.
The method of fabricating a colloidal quantum dot continuous laser according to claim 18, wherein said pump source is a continuous laser comprising a semiconductor laser, a gas laser, and a fiber laser.
A colloidal quantum dot continuous laser comprising: a pump source, a gain medium, and a resonant cavity, wherein

The gain medium and the resonant cavity are composite luminescent films composed of a perovskite quantum dot material and a polymer having a micro/nano optical structure.
The colloidal quantum dot continuous laser according to claim 25, wherein said micro/nano optical structure comprises a photonic crystal structure and a grating structure.
The colloidal quantum dot continuous laser according to claim 25, wherein

The perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX 3 and/or A 2 BX 6 and/or AB 2 X 5 and/or A 4 BX. 6 and/or A 3 B 2 X 9 , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion;

The polymer is a transparent polymer that is soluble in a polar organic solvent.
The colloidal quantum dot continuous laser according to claim 25, wherein the emission wavelength of said colloidal quantum dot continuous laser is continuously adjustable in the range of 400 nm to 800 nm by changing the composition or size of the perovskite quantum dot material.
The colloidal quantum dot continuous laser according to claim 25, wherein said pump source is a continuous laser comprising a semiconductor laser, a gas laser, and a fiber laser.
An LED-pumped colloidal quantum dot continuous laser comprising a pump source, a gain medium and a resonant cavity, wherein

The pump source is for exciting the gain medium,

The gain medium is a composite luminescent film composed of a perovskite quantum dot material and a polymer for receiving radiation of the pump source to excite photons.

The resonant cavity is for amplifying photons excited by the gain medium to output a continuous laser,

Wherein, the pump source is a light emitting diode LED.
The colloidal quantum dot continuous laser according to claim 30, wherein said LED is any one selected from the group consisting of:

Semiconductor light emitting diode

Organic light emitting diode OLED;

Quantum dot light emitting diode QLED;

a micro-light emitting diode Micro-LED, which is an on-chip integrated high-density micro-sized LED array;

A perovskite light emitting diode whose luminescent material is an organic/inorganic hybrid perovskite or an inorganic perovskite material.
The colloidal quantum dot continuous laser according to claim 31, wherein

The OLED includes a small molecule organic electroluminescent device and a high molecular organic electroluminescent device;

The QLED quantum dot material includes II-VI quantum dots, III-V quantum dots, I-III-VI quantum dots, and perovskite quantum dots.
The colloidal quantum dot continuous laser according to claim 30, wherein said resonant cavity comprises a distributed Bragg mirror and a distributed feedback structure, wherein

When the resonant cavity is a distributed Bragg mirror, the gain medium is formed between two mirrors having different reflectivities;

When the resonant cavity is a distributed feedback structure, the gain medium is formed on a light receiving surface of the distributed feedback structure, and the gain medium has a photonic crystal structure or a grating structure.
The colloidal quantum dot continuous laser according to claim 33, wherein said gain medium having a photonic crystal structure or a grating structure is attached to a light-emitting surface of said LED when said resonant cavity is a distributed feedback structure To form an integrated device.
A colloidal quantum dot continuous laser according to claim 30, further comprising: a lens disposed between said pump source and said resonant cavity for concentrating light emitted by said pump source.
The colloidal quantum dot continuous laser according to claim 30, wherein

The perovskite quantum dot material is an organic salt and/or an inorganic salt of a perovskite quantum dot having a structural formula of ABX 3 and/or A 2 BX 6 and/or AB 2 X 5 and/or A 4 BX. 6 and/or A 3 B 2 X 9 , wherein A is a metal cation or a positively charged organic amine ion, B is a metal cation, and X is a halogen ion;

The polymer is a transparent polymer that is soluble in a polar organic solvent.
The colloidal quantum dot continuous laser according to claim 30, wherein the laser emission wavelength of the perovskite quantum dot continuous laser is continuously in the range of 400 nm to 800 nm by changing the composition or size of the perovskite quantum dot material. Tune.
The colloidal quantum dot continuous laser according to claim 30, wherein said resonant cavity is a photonic crystal structure or a grating structure formed on a light outgoing surface of said LED, said gain medium being located on said photonic crystal structure or grating structure .
The colloidal quantum dot continuous laser according to claim 38, wherein the light-emitting surface of the LED comprises a rigid transparent material selected from the group consisting of glass and ITO glass.
The colloidal quantum dot continuous laser according to claim 38, wherein the light-emitting surface of the LED comprises a flexible transparent material selected from the group consisting of plastic, metal foil, ultra-thin glass, paper substrate, and biological A group of composite film substrates.