CN111575006A - Synthesis method of alloy quantum dots - Google Patents

Synthesis method of alloy quantum dots Download PDF

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CN111575006A
CN111575006A CN202010165149.0A CN202010165149A CN111575006A CN 111575006 A CN111575006 A CN 111575006A CN 202010165149 A CN202010165149 A CN 202010165149A CN 111575006 A CN111575006 A CN 111575006A
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罗培栋
王群
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Ningbo Dxc New Material Technology Co ltd
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Abstract

A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting a mixture of a low-activity selenium source, zinc fatty acid salt and cadmium fatty acid salt in a solvent at the temperature of 250 ℃ and 330 ℃, taking out a trace reaction solution through a needle in the reaction period, monitoring the wavelength by using an optical fiber spectrometer, and cooling to the temperature of 110-200 ℃ after the monitored wavelength reaches the expected wavelength, and dropwise adding a zinc xanthate solution into an injection pump; the low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder and a long-chain acrylate monomer at 180-230 ℃ for 5-20 minutes under the initiation of a free radical initiator. The invention has the advantages of low cost, simple synthesis steps, wide adjustment range of emission spectrum and excellent optical performance of the quantum dots.

Description

Synthesis method of alloy quantum dots
Technical Field
The invention relates to a method for synthesizing an alloy quantum dot.
Background
Quantum dots are an example of a semiconductor material having a diameter of only a few nanometers, and the exciton energy level is separated due to the quantum confinement effect since the radius thereof is smaller than the bohr radius of the exciton. The quantum dots can absorb high-energy light with shorter wavelength to generate excitons, and the exciton relaxation emits light with longer wavelength. At present, quantum dots are generally coated with shells such as zinc sulfide, cadmium sulfide and other materials to limit the exciton of the quantum dots in application, surface dangling bonds are eliminated, the quantum yield is improved, the stability is improved, and the half-peak width is reduced. However, the cladding inevitably has an influence on the emission spectrum of the quantum dots, and generally, the phenomenon of red shift of the emission spectrum of the quantum dots generally occurs in the cladding process. Therefore, the nuclear shell quantum dots obtained after some green light quantum dot nuclear cores are wrapped with the shellsThe emission spectrum is often red or orange, and blue and green core-shell quantum dots are prepared, wherein the core emission spectrum is generally purple and blue. For the core-shell quantum dots emitting in full spectrum, the core of the quantum dots of alloy is often required to be prepared, and the emission spectrum of the core is controlled by controlling the proportion of anions and cations. Currently, anion alloy CdS is commonxSe1-xCore, cationic alloy CdxZn1-xSe, anion and cation alloy CdZnSeS and other cores, and the cation radius is smaller than that of anions, so that the reaction condition for preparing the cation alloy quantum dots is easier, the cation diffusion speed is higher, and the half-peak width of the obtained cation alloy quantum dot core is narrower.
At present, a great deal of research on cationic alloy quantum dots has been carried out, particularly on CdxZn1-xSe quantum dots of the type are used for preparing green core-shell quantum dots by a Li Lin pine subject group of Henan university, octadecene and selenium powder are heated and reacted for 3 hours at 220 ℃ to obtain a selenium precursor to prepare the cationic alloy quantum dots, the quantum yield is over 90 percent, the half-peak width is less than 30nm, and the performance is excellent. Further, the group of subjects named xugyong 37795 of taiwan traffic university in china was to inject a trioctylphosphine solution of selenium into an oleate solution of zinc and cadmium to prepare cationic alloy quantum dots, and the core size and emission spectrum were controlled by adjusting the zinc-cadmium ratio and the amount of oleylamine added. The Von Boss topic group of Lanzhou university prepares the cationic alloy quantum dots by reacting selenium powder with oleylamine to prepare a selenium source, but the activity of the selenium source is greatly reduced by excessive oleylamine ligand, so that the prepared quantum dots have larger cores and are mostly in the red light emission interval. The above cationic alloy quantum dots are unavoidable problems, that is, the preparation concentration of the anionic precursor selenium source is too low, mostly 0.1M, and mass production in industry cannot be realized, while the high-activity selenium source Se-sus proposed by penlaugh task group of Zhejiang university is not limited in concentration, but too high in activity, and generally used for preparing pure zinc selenide or zinc selenide sphalerite crystals, and the quality of the cationic alloy quantum dots is too poor. There is also a current choice for selenium sources, as described in j. mater. chem. a, 2014, 2,6879The selenium source with the concentration as high as 1M can be prepared by reacting octadecene with selenium powder at 230 ℃ for 1-3 hours under the action of azodiisobutyronitrile, but the price of octadecene is expensive, the activity of double bonds of octadecene is weak, the preparation temperature of the high-concentration selenium source is too high, and the time is long.
The cation alloy quantum dot has wide adjustable range of emission wavelength, narrow half-peak width and high fluorescence efficiency, and the cladding method is easy to realize industrially. The penlaugh task group has deeper research on the cadmium selenide quantum dots, and the penlaugh task group finds that the wavelength of the cadmium sulfide quantum dots wrapped by the cadmium selenide can be continuously red-shifted, and the exciton wave function cannot be limited, so that the quantum dots have poor stability and are easily influenced by the surface state of the quantum dots. The zinc sulfide wrapped confinement effect is good, but larger lattice mismatch exists, and the half-peak width and the fluorescence efficiency of the quantum dots are poor. Therefore, the quantum dots select shells wrapped with zinc cadmium sulfide, measure the core concentration of the quantum dots, calculate the amount of shell precursors added to each layer, and synthesize the quantum dots through tem correction, and the method has the advantages of complex steps and low efficiency. The cationic alloy quantum dots do not have the problem of lattice mismatch, can be directly wrapped on a zinc sulfide shell and can be prepared by a method of slowly adding a shell precursor through a syringe pump without excessive manual operation.
Compared with common alkyl olefin such as octadecene, the double bond of the acrylate monomer is influenced by an electron-withdrawing ester group, the activity is higher, and the acrylate monomer can be easily reacted under a free radical initiator. The long-chain acrylate has high activity and high boiling point, generally above 200 ℃, and also meets the temperature requirement of alloying quantum dot synthesis.
Disclosure of Invention
In view of the above disadvantages of the prior art, there is a need to improve a selenium source to solve the disadvantages of high cost and low concentration of the current selenium source to prepare the cationic alloy quantum dots.
The technical scheme for solving the technical problem is as follows: a synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting a mixture of a low-activity selenium source, zinc fatty acid salt and cadmium fatty acid salt in a solvent at the temperature of 250 ℃ and 330 ℃, taking out a trace reaction solution through a needle in the reaction period, monitoring the wavelength by using an optical fiber spectrometer, and cooling to the temperature of 110-200 ℃ after the monitored wavelength reaches the expected wavelength, and dropwise adding a zinc xanthate solution into an injection pump;
the low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder and a long-chain acrylate monomer at 180-230 ℃ for 5-20 minutes under the initiation of a free radical initiator.
Preferably, the long-chain acrylate monomer is behenyl acrylate, or cetyl acrylate, or stearyl acrylate.
Preferably, the radical initiator is azobisisobutyronitrile, or benzoyl peroxide, or tert-amyl 2-ethylhexanoate peroxide (TAPO), or dicumyl peroxide (DCP), or di-tert-butyl peroxide (DTBP).
Preferably, the fatty acid salt of zinc and the fatty acid salt of cadmium are oleate, stearate, or myristate.
Preferably, the molar ratio of the selenium powder to the long-chain acrylate monomer is 1: 2-100; the addition amount of the free radical initiator is 2-5% of the total mass of the selenium powder and the long-chain acrylate monomer.
Preferably, the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of octadecene to liquid paraffin is 1:0.1-10, and the volume of the solvent added is equal to the total volume of the low-activity selenium source, the fatty acid salt of zinc and the fatty acid salt of cadmium.
Preferably, the molar ratio of the selenium powder to the total amount of the zinc cations and the cadmium cations is 1-3:1, and the molar ratio of the zinc ions to the cadmium ions is 1-10: 1.
Preferably, the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, and the concentration of the zinc xanthate solution is 0.1mol/L-2 mol/L.
The invention has the beneficial effects that: the method has the advantages of low cost, simple synthesis steps, wide emission spectrum adjustment range and excellent optical performance of the quantum dots.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example one
A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting the mixture of the low-activity selenium source and zinc oleate and cadmium oleate in a solvent at the temperature of 250 ℃ and 330 ℃ (because the heating temperature is difficult to control, the temperature can be within the range, and the temperature in the heating process is allowed to float), wherein the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of octadecene to liquid paraffin is 1:5, and the adding volume of the solvent is equal to the total volume of the low-activity selenium source, the zinc oleate and the cadmium oleate.
During the reaction, a trace amount of reaction solution is taken out through a needle head, a fiber optic spectrometer is used for monitoring the wavelength, after the monitored wavelength reaches the expected wavelength (the wavelength range of each color light is different, as is well known, the wavelength range of red light is 620-750 nm, the wavelength range of orange light is 590-620 nm, the wavelength range of yellow light is 570-590 nm, the wavelength range of green light is 495-570 nm, the wavelength range of cyan light is 476-495 nm, the wavelength range of blue light is 450-475 nm, and the wavelength range of purple light is 380-450 nm, so that quantum dots of different colors can be obtained by controlling the expected wavelength to reach the wavelength range of each color light), the temperature is reduced to 110-200 ℃, a zinc xanthate solution is dripped through an injection pump (because the heating temperature is difficult to control, the temperature can be allowed to float in the range), the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, the concentration thereof was 1 mol/L.
The low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder (the uniform-particle size selenium powder cannot be obtained in production practice as long as the particle size of the selenium powder is controlled to be 100-500 mesh) and behenyl acrylate under the initiation of azobisisobutyronitrile at 180-230 ℃ (because the heating temperature is difficult to control, so the temperature can be allowed to float in the heating process as long as the temperature is in the range) for 10 minutes. Wherein the molar ratio of the selenium powder to the behenyl acrylate is 1: 50; the addition amount of azobisisobutyronitrile as a free radical initiator is 3% of the total mass of the selenium powder and the behenyl acrylate.
The molar ratio of the selenium powder to the total amount of zinc cations in the zinc oleate and cadmium cations in the cadmium oleate is 2:1, and the molar ratio of the zinc ions to the cadmium ions is 5: 1.
Example two
A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting the low-activity selenium source with a mixture of zinc stearate and cadmium stearate in a solvent at the temperature of 250 ℃ and 330 ℃ (because the heating temperature is difficult to control, the temperature can be within the range, and the temperature in the heating process is allowed to float), wherein the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of the octadecene to the liquid paraffin is 1:0.1, and the adding volume of the solvent is equal to the total volume of the low-activity selenium source, the zinc stearate and the cadmium stearate.
During the reaction, a trace amount of reaction solution is taken out through a needle head, a fiber optic spectrometer is used for monitoring the wavelength, after the monitored wavelength reaches the expected wavelength (the wavelength range of each color light is different, as is well known, the wavelength range of red light is 620-750 nm, the wavelength range of orange light is 590-620 nm, the wavelength range of yellow light is 570-590 nm, the wavelength range of green light is 495-570 nm, the wavelength range of cyan light is 476-495 nm, the wavelength range of blue light is 450-475 nm, and the wavelength range of purple light is 380-450 nm, so that quantum dots of different colors can be obtained by controlling the expected wavelength to reach the wavelength range of each color light), the temperature is reduced to 110-200 ℃, a zinc xanthate solution is dripped through an injection pump (because the heating temperature is difficult to control, the temperature can be allowed to float in the range), the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, the concentration thereof was 2 mol/L.
The low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder (the uniform-particle-size selenium powder cannot be obtained in production practice as long as the particle size of the selenium powder is controlled to be 100-500 mesh) and cetyl acrylate under the initiation of benzoyl peroxide at 180-230 ℃ (because the heating temperature is difficult to control, the temperature can be allowed to float in the range) for 15 minutes. Wherein the molar ratio of the selenium powder to the hexadecyl acrylate is 1: 2; the addition amount of benzoyl peroxide as a free radical initiator was 3.5% of the total mass of selenium powder and cetyl acrylate.
The molar ratio of the selenium powder to the total amount of zinc cations in the zinc stearate and cadmium cations in the cadmium stearate is 1:1, and the molar ratio of the zinc ions to the cadmium ions is 3: 1.
EXAMPLE III
A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting the low-activity selenium source and the mixture of zinc myristate and cadmium myristate in a solvent at 250-330 ℃ (because the heating temperature is difficult to control, the temperature can be within the range, and the temperature is allowed to float in the heating process), wherein the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of octadecene to liquid paraffin is 1:1, and the adding volume of the solvent is equal to the total volume of the low-activity selenium source, the zinc myristate and the cadmium myristate.
During the reaction, a trace amount of reaction solution is taken out through a needle head, a fiber optic spectrometer is used for monitoring the wavelength, after the monitored wavelength reaches the expected wavelength (the wavelength range of each color light is different, as is well known, the wavelength range of red light is 620-750 nm, the wavelength range of orange light is 590-620 nm, the wavelength range of yellow light is 570-590 nm, the wavelength range of green light is 495-570 nm, the wavelength range of cyan light is 476-495 nm, the wavelength range of blue light is 450-475 nm, and the wavelength range of purple light is 380-450 nm, so that quantum dots of different colors can be obtained by controlling the expected wavelength to reach the wavelength range of each color light), the temperature is reduced to 110-200 ℃, a zinc xanthate solution is dripped through an injection pump (because the heating temperature is difficult to control, the temperature can be allowed to float in the range), the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, the concentration thereof was 0.1 mol/L.
The low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder (the uniform-particle size selenium powder cannot be obtained in the production practice as long as the particle size of the selenium powder is controlled to be 100-500 mesh) and octadecyl acrylate under the initiation of the peroxy 2-ethyl hexanoate at 180-230 ℃ (the heating temperature is difficult to control, so the temperature can be within the range, and the temperature is allowed to float in the heating process) for 5 minutes. Wherein the molar ratio of the selenium powder to the octadecyl acrylate is 1: 10; the addition amount of the tert-amyl peroxy-2-ethylhexanoate as a free radical initiator is 2.5 percent of the total mass of the selenium powder and the octadecyl acrylate.
The molar ratio of the selenium powder to the total amount of zinc cations in the zinc myristate and cadmium cations in the cadmium myristate is 3:1, and the molar ratio of the zinc ions to the cadmium ions is 8: 1.
Example four
A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting the low-activity selenium source and the mixture of zinc oleate and cadmium oleate in a solvent at the temperature of 250 ℃ and 330 ℃ (because the heating temperature is difficult to control, the temperature can be within the range, and the temperature in the heating process is allowed to float), wherein the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of octadecene to liquid paraffin is 1:10, and the adding volume of the solvent is equal to the total volume of the low-activity selenium source, the zinc oleate and the cadmium oleate.
During the reaction, a trace amount of reaction solution is taken out through a needle head, a fiber optic spectrometer is used for monitoring the wavelength, after the monitored wavelength reaches the expected wavelength (the wavelength range of each color light is different, as is well known, the wavelength range of red light is 620-750 nm, the wavelength range of orange light is 590-620 nm, the wavelength range of yellow light is 570-590 nm, the wavelength range of green light is 495-570 nm, the wavelength range of cyan light is 476-495 nm, the wavelength range of blue light is 450-475 nm, and the wavelength range of purple light is 380-450 nm, so that quantum dots of different colors can be obtained by controlling the expected wavelength to reach the wavelength range of each color light), the temperature is reduced to 110-200 ℃, a zinc xanthate solution is dripped through an injection pump (because the heating temperature is difficult to control, the temperature can be allowed to float in the range), the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, the concentration thereof was 1.5 mol/L.
The low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder (the uniform-particle-size selenium powder cannot be obtained in production practice as long as the particle size of the selenium powder is controlled to be 100-500 mesh) and docosanyl acrylate under the initiation of dicumyl peroxide at 180-230 ℃ (because the heating temperature is difficult to control, the temperature can be allowed to float in the heating process as long as the temperature is in the range) for 20 minutes. Wherein the molar ratio of the selenium powder to the behenyl acrylate is 1: 80; the addition amount of dicumyl peroxide as a free radical initiator is 5% of the total mass of the selenium powder and the behenyl acrylate.
The molar ratio of the selenium powder to the total amount of zinc cations in the zinc oleate and cadmium cations in the cadmium oleate is 2.2:1, and the molar ratio of the zinc ions to the cadmium ions is 1: 1.
EXAMPLE five
A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting the low-activity selenium source with a mixture of zinc stearate and cadmium stearate in a solvent at the temperature of 250 ℃ and 330 ℃ (because the heating temperature is difficult to control, the temperature can be within the range, and the temperature in the heating process is allowed to float), wherein the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of the octadecene to the liquid paraffin is 1:0.5, and the adding volume of the solvent is equal to the total volume of the low-activity selenium source, the zinc stearate and the cadmium stearate.
During the reaction, a trace amount of reaction solution is taken out through a needle head, a fiber optic spectrometer is used for monitoring the wavelength, after the monitored wavelength reaches the expected wavelength (the wavelength range of each color light is different, as is well known, the wavelength range of red light is 620-750 nm, the wavelength range of orange light is 590-620 nm, the wavelength range of yellow light is 570-590 nm, the wavelength range of green light is 495-570 nm, the wavelength range of cyan light is 476-495 nm, the wavelength range of blue light is 450-475 nm, and the wavelength range of purple light is 380-450 nm, so that quantum dots of different colors can be obtained by controlling the expected wavelength to reach the wavelength range of each color light), the temperature is reduced to 110-200 ℃, a zinc xanthate solution is dripped through an injection pump (because the heating temperature is difficult to control, the temperature can be allowed to float in the range), the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, the concentration thereof was 1.2 mol/L.
The low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder (the uniform-particle size selenium powder cannot be obtained in the production practice as long as the particle size of the selenium powder is controlled to be 100-500 mesh) and cetyl acrylate under the initiation of di-tert-butyl peroxide at 180-230 ℃ (because the heating temperature is difficult to control, the temperature can be allowed to float in the heating process as long as the temperature is in the range) for 8 minutes. Wherein the molar ratio of the selenium powder to the hexadecyl acrylate is 1: 100; the addition amount of di-tert-butyl peroxide as a free radical initiator is 2 percent of the total mass of the selenium powder and the hexadecyl acrylate.
The molar ratio of the selenium powder to the total amount of zinc cations in the zinc stearate and cadmium cations in the cadmium stearate is 2.5:1, and the molar ratio of the zinc ions to the cadmium ions is 10: 1.
EXAMPLE six
A synthetic method of an alloy quantum dot comprises the following synthetic steps: reacting the low-activity selenium source and the mixture of zinc stearate and cadmium stearate in a solvent at the temperature of 250 ℃ and 330 ℃ (because the heating temperature is difficult to control, the temperature can be within the range, and the temperature in the heating process is allowed to float), wherein the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of octadecene to liquid paraffin is 1:7, and the adding volume of the solvent is equal to the total volume of the low-activity selenium source, the zinc stearate and the cadmium stearate.
During the reaction, a trace amount of reaction solution is taken out through a needle head, a fiber optic spectrometer is used for monitoring the wavelength, after the monitored wavelength reaches the expected wavelength (the wavelength range of each color light is different, as is well known, the wavelength range of red light is 620-750 nm, the wavelength range of orange light is 590-620 nm, the wavelength range of yellow light is 570-590 nm, the wavelength range of green light is 495-570 nm, the wavelength range of cyan light is 476-495 nm, the wavelength range of blue light is 450-475 nm, and the wavelength range of purple light is 380-450 nm, so that quantum dots of different colors can be obtained by controlling the expected wavelength to reach the wavelength range of each color light), the temperature is reduced to 110-200 ℃, a zinc xanthate solution is dripped through an injection pump (because the heating temperature is difficult to control, the temperature can be allowed to float in the range), the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, the concentration thereof was 0.5 mol/L.
The low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder (the uniform-particle size selenium powder cannot be obtained in the production practice as long as the particle size of the selenium powder is controlled to be 100-500 mesh) and cetyl acrylate under the initiation of di-tert-butyl peroxide at 180-230 ℃ (because the heating temperature is difficult to control, the temperature can be allowed to float in the heating process as long as the temperature is in the range) for 18 minutes. Wherein the molar ratio of the selenium powder to the hexadecyl acrylate is 1: 40; the addition amount of di-tert-butyl peroxide as a free radical initiator is 4% of the total mass of the selenium powder and the hexadecyl acrylate.
The molar ratio of the selenium powder to the total amount of zinc cations in the zinc stearate and cadmium cations in the cadmium stearate is 1.5:1, and the molar ratio of the zinc ions to the cadmium ions is 7: 1.

Claims (9)

1. A synthetic method of an alloy quantum dot is characterized by comprising the following synthetic steps: reacting a mixture of a low-activity selenium source, zinc fatty acid salt and cadmium fatty acid salt in a solvent at the temperature of 250 ℃ and 330 ℃, taking out a trace reaction solution through a needle in the reaction period, monitoring the wavelength by using an optical fiber spectrometer, and cooling to the temperature of 110-200 ℃ after the monitored wavelength reaches the expected wavelength, and dropwise adding a zinc xanthate solution into an injection pump;
the low-activity selenium source is synthesized by reacting 100-500 mesh selenium powder and a long-chain acrylate monomer at 180-230 ℃ for 5-20 minutes under the initiation of a free radical initiator.
2. The method for synthesizing an alloy quantum dot according to claim 1, wherein: the long-chain acrylate monomer is behenyl acrylate, or cetyl acrylate, or stearyl acrylate.
3. The method for synthesizing an alloy quantum dot according to claim 1, wherein: the free radical initiator is azobisisobutyronitrile, benzoyl peroxide, tert-amyl peroxy-2-ethyl hexanoate, dicumyl peroxide or di-tert-butyl peroxide.
4. The method for synthesizing an alloy quantum dot according to claim 1, wherein: the fatty acid salt of zinc and the fatty acid salt of cadmium are oleate, stearate or myristate.
5. The method for synthesizing an alloy quantum dot according to any one of claims 1 to 4, wherein: the molar ratio of the selenium powder to the long-chain acrylate monomer is 1: 2-100; the addition amount of the free radical initiator is 2-5% of the total mass of the selenium powder and the long-chain acrylate monomer.
6. The method for synthesizing an alloy quantum dot according to any one of claims 1 to 4, wherein: the solvent is formed by mixing octadecene and liquid paraffin, the molar ratio of octadecene to liquid paraffin is 1:0.1-10, and the volume of the added solvent is equal to the total volume of the low-activity selenium source, the fatty acid salt of zinc and the fatty acid salt of cadmium.
7. The method for synthesizing an alloy quantum dot according to any one of claims 1 to 4, wherein: the molar ratio of the selenium powder to the total amount of the zinc cations and the cadmium cations is 1-3:1, and the molar ratio of the zinc ions to the cadmium ions is 1-10: 1.
8. The method for synthesizing an alloy quantum dot according to any one of claims 1 to 4, wherein: the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, and the concentration of the zinc xanthate solution is 0.1-2 mol/L.
9. The method for synthesizing an alloy quantum dot according to any one of claims 1 to 4, wherein: the zinc xanthate solution is prepared by dissolving zinc xanthate in oleylamine, and the concentration of the zinc xanthate solution is 0.1-2 mol/L.
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