CN108739979B - Photosynthetic fresh-keeping lamp and device - Google Patents

Photosynthetic fresh-keeping lamp and device Download PDF

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CN108739979B
CN108739979B CN201810391203.6A CN201810391203A CN108739979B CN 108739979 B CN108739979 B CN 108739979B CN 201810391203 A CN201810391203 A CN 201810391203A CN 108739979 B CN108739979 B CN 108739979B
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photosynthetic
quantum dots
freshness
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emission peak
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CN108739979A (en
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王允军
方龙
马卜
方涛
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Suzhou Xingshuo Nanotech Co Ltd
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables

Abstract

The invention discloses a photosynthetic fresh-keeping lamp, which comprises: an excitation light source to generate excitation light; the quantum dot element formed in the emitting direction of the excitation light comprises a plurality of first quantum dots, and the plurality of first quantum dots absorb at least part of the excitation light and generate a first emission peak with the peak wavelength of 650-670 nm. The photosynthetic freshness lamp according to the present invention is not intended to simulate the spectrum of sunlight, but focuses on the first emission peak having a peak wavelength in the range of 650 nm to 670 nm. The first emission peak generated by the photosynthetic fresh-keeping lamp can promote synthesis of chlorophyll A, so that light generated by the photosynthetic fresh-keeping lamp has excellent pertinence in photosynthetic fresh-keeping. Therefore, the photosynthetic freshness-keeping lamp according to the invention is particularly suitable for keeping fruits and vegetables fresh.

Description

Photosynthetic fresh-keeping lamp and device
Technical Field
The application belongs to the technical field of keep fresh, in particular to photosynthetic freshness protection lamp and corresponding device.
Background
The freshness of the fruits and vegetables directly affects the taste, nutritional value and the like of the fruits and vegetables, so people pay more attention to the freshness of the fruits and vegetables when eating the fruits and vegetables. Therefore, people pay attention to how to maintain the freshness of fruits and vegetables.
At present, the freshness of fruits and vegetables can be maintained by a photosynthetic fresh-keeping method, and the method illuminates the fruits and vegetables through a light source, so that the stored fruits and vegetables can continue photosynthesis, the moisture, the nutrition and the like of the fruits and vegetables are kept, and the aim of keeping the freshness is fulfilled. The existing photosynthetic fresh-keeping lamp utilizes an LED (Light Emitting Diode) to simulate sunlight and irradiate fruits and vegetables so as to perform photosynthesis.
However, fruits and vegetables do not absorb light of all wave bands in visible light during photosynthesis, so that the existing photosynthetic fresh-keeping lamp is poor in pertinence on selectivity of emission spectrum and poor in fresh-keeping effect.
Disclosure of Invention
To the technical problem, the application provides a photosynthetic freshness protection lamp and device that emission light has pertinence.
A photosynthetic refreshment light, comprising: an excitation light source to generate excitation light; a quantum dot element formed in the direction of emission of the exciting light rays, comprising a plurality of first quantum dots that absorb at least part of the exciting light rays and produce a first emission peak having a peak wavelength in the range of 650 nm to 670 nm.
The photosynthetic freshness lamp according to the present invention is not intended to simulate the spectrum of sunlight, but focuses on the first emission peak having a peak wavelength in the range of 650 nm to 670 nm. The first emission peak generated by the photosynthetic fresh-keeping lamp can promote synthesis of chlorophyll A, so that light generated by the photosynthetic fresh-keeping lamp has excellent pertinence in photosynthetic fresh-keeping. Therefore, the photosynthetic freshness-keeping lamp according to the invention is particularly suitable for keeping fruits and vegetables fresh.
In one embodiment, the half-peak width of the first emission peak ranges from 30 nanometers to 60 nanometers; preferably, the half-width of the first emission peak is in the range of 35 nm to 50 nm.
In one embodiment, the plurality of first quantum dots are quantum dots with core-shell structures, and the core of each first quantum dot is CdxZn1-xSeyS1-yThe quantum dots have x being more than or equal to 0 and less than or equal to 1, and y being more than or equal to 0 and less than or equal to 1.
In one embodiment, the plurality of first quantum dots are CdZnSe/CdS/ZnS quantum dots; preferably, the particle size distribution of the CdZnSe/CdS/ZnS quantum dots is in normal distribution; more preferably, the expected value of the particle size of the CdZnSe/CdS/ZnS quantum dots is 10-14 nanometers.
In one embodiment, the particle size distribution coefficient of the CdZnSe/CdS/ZnS quantum dots measured by dynamic light scattering is 0.15-0.60; preferably, the particle size distribution coefficient of the plurality of CdZnSe/CdS/ZnS quantum dots measured by dynamic light scattering is 0.20-0.50.
In one embodiment, the quantum dot element further comprises a plurality of second quantum dots that absorb at least a portion of the excitation light and produce a second emission peak having a peak wavelength in a range from 440 nanometers to 470 nanometers.
In one embodiment, the plurality of second quantum dots are quantum dots with core-shell structures, and the core of each second quantum dot is CdwZn1-wSezS1-zWherein w is more than or equal to 0 and less than or equal to 1, and z is more than or equal to 0 and less than or equal to 1; preferably, the plurality of second quantum dots are ZnSe/ZnS quantum dots.
In one embodiment, the ratio of the peak intensity of the first peak to the intensity of the second peak is (3.5-7): 1.
in one embodiment, the mass ratio of the plurality of first quantum dots to the plurality of second quantum dots is 1: (1.5 to 7).
A photosynthetic freshness preservation device, comprising: a freshness-retaining area; the photosynthetic freshness keeping lamp at least partially irradiates the freshness keeping area with the emitted light; wherein, photosynthetic freshness lamp includes: an excitation light source to generate excitation light; a quantum dot element formed in the direction of emission of the exciting light rays, comprising a plurality of first quantum dots that absorb at least part of the exciting light rays and produce a first emission peak having a peak wavelength in the range of 650 nm to 670 nm.
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Fig. 1 is a schematic structural diagram of a photosynthetic freshness retaining lamp according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a photosynthetic freshness retaining device according to an embodiment of the present application.
In the drawings like parts are provided with the same reference numerals. The figures show embodiments of the application only schematically.
Detailed Description
The technical solutions in the examples of the present application will be described in detail below with reference to the embodiments of the present application. It should be noted that the described embodiments are only some embodiments of the present application, and not all embodiments.
In the present embodiment, referring to fig. 1, a photosynthetic fresh-keeping lamp 1 includes an excitation light source 11 and a quantum dot element 13, the excitation light source 11 is used for generating excitation light, and the quantum dot element 13 is disposed in a direction in which the excitation light is emitted. The quantum dot element 13 comprises a plurality of first quantum dots 131, the plurality of first quantum dots 131 absorbing at least part of the excitation light and generating a first emission peak having a peak wavelength between 650 nm and 670 nm.
The plurality of first quantum dots 131 arranged in the quantum dot element 13 are excited by the excitation light to generate a first emission peak, the peak wavelength of the first emission peak is 650 nm to 670 nm, and the emission peak can promote the synthesis of chlorophyll a, so that the light generated by the photosynthetic freshness-keeping lamp 1 has excellent pertinence in the photosynthetic freshness-keeping process.
In a preferred embodiment, the half-width of the first emission peak is in the range of 30 nm to 60 nm. Preferably, the half-width of the first emission peak is in the range of 35 nm to 50 nm. In the field of quantum dots, the emission peak of the quantum dots after being excited has extremely narrow half-peak width due to the characteristics of the quantum dots, so the quantum dots have extremely high monochromaticity. Therefore, there is a great deal of attention on how to reduce the half-peak width of the emission peak of the quantum dot as much as possible to fully utilize the advantage of good monochromaticity of the emitted light of the quantum dot, and at present, the half-peak width of the emission peak of the quantum dot can be reduced to about ten nanometers, and even smaller values are expected. However, the inventors have unexpectedly found that monochromatic light with a slightly larger half-peak width (e.g., 30 nm to 60 nm; particularly, 35 nm to 50 nm) can contribute more to chlorophyll A synthesis than the current quantum dot emission spectra with extremely small half-peak widths at light wavelengths from 650 nm to 670 nm. Compared with the light emitting diode (the half-peak width of the light emitting spectrum is about 18 nanometers) commonly used in the prior art, the half-peak width of the emission peak of the quantum dot used in the application is obviously larger. For this reason, quantum dots with small half-peak widths of the light emission spectrum do not need to be selected purposely in the scheme of the application, which helps to reduce the manufacturing cost of the photosynthetic freshness lamp. From another perspective, in the field of photosynthetic freshness-retaining lamps, the technical scheme of the application overcomes the technical prejudice of reducing the half-peak width of the emission peak of the quantum dot as much as possible.
In this embodiment, the first quantum dot is a quantum dot having a core-shell structure, and the core of the first quantum dot is CdxZn1- xSeyS1-yWherein x is more than or equal to 0 and less than or equal to 1, and y is more than or equal to 0 and less than or equal to 1. The nucleus is CdxZn1-xSeyS1-yThe quantum dot has stable optical property, and the photosynthetic refreshing lamp can have excellent optical property after adopting the quantum dot. In addition, in the preparation process of the quantum dot, parameters such as emission peak, half-peak width and the like can be easily controlled, so that the quantum dot which is suitable for the optical requirement of the photosynthetic fresh-keeping lamp is adopted, and furtherSo that the photosynthetic fresh-keeping lamp has excellent pertinence.
Preferably, the first quantum dots are CdZnSe/CdS/ZnS quantum dots, and the CdZnSe/CdS/ZnS quantum dots comprise a CdZnSe core, and a CdS shell layer and a ZnS shell layer which are sequentially distributed outside the CdZnSe core. The particle size distribution of the CdZnSe/CdS/ZnS quantum dots is in normal distribution, and the expected value of the normal distribution of the particle sizes is between 10 nanometers and 14 nanometers, so that the peak wavelength of an emission peak generated after the CdZnSe/CdS/ZnS quantum dots are excited is between 650 nanometers and 670 nanometers. The photosynthetic fresh-keeping lamp can emit an emission peak with the peak wavelength between 650 nanometers and 670 nanometers by adjusting the parameters of the particle size of the CdZnSe/CdS/ZnS quantum dots, so that the emission peak can promote the synthesis of chlorophyll A in fruits and vegetables, and the photosynthetic fresh-keeping lamp has excellent pertinence.
When the Particle size distribution coefficient (PDI) of the CdZnSe/CdS/ZnS quantum dots obtained by Dynamic Light Scattering (DLS) measurement is 0.15-0.65, and the width of the half-peak width of the emission peak of the CdZnSe/CdS/ZnS quantum dots is 30-60 nm. Furthermore, when the particle size distribution coefficient of the CdZnSe/CdS/ZnS quantum dots obtained by dynamic light scattering measurement is 0.20-0.50, the width of the half-peak width of the peak emitted by the CdZnSe/CdS/ZnS quantum dots is 35-50 nanometers. The particle size distribution coefficient of the CdZnSe/CdS/ZnS quantum dots is measured by dynamic light scattering after the CdZnSe/CdS/ZnS quantum dots are dissolved in chloroform.
In one embodiment, the quantum dot element further comprises a plurality of second quantum dots 133, the second quantum dots 133 absorbing at least a portion of the excitation light to produce a second emission peak having a peak wavelength in a range from 440 nanometers to 470 nanometers. The second quantum dots 133 and the first quantum dots 131 are uniformly mixed and dispersed in the quantum dot element. The inventor surprisingly finds that the photosynthetic fresh-keeping lamp can emit the first emission peak and the second emission peak at the same time, and has better photosynthetic fresh-keeping effect on fruits and vegetables.
In this embodiment, the plurality of second quantum dots are quantum dots having a core-shell structure, and the core of the second quantum dot is CdwZn1-wSezS1-zWherein, 0W is more than or equal to 1, and z is more than or equal to 0 and less than or equal to 1. Preferably, the second quantum dots are ZnSe/ZnS quantum dots, and the ZnSe/ZnS quantum dots comprise a ZnSe core and a ZnS shell layer distributed outside the ZnSe core.
The inventor finds that when the photosynthetic freshness-retaining lamp irradiates fruits and vegetables, the photosynthetic freshness-retaining lamp is more suitable for photosynthetic freshness-retaining when the light rays with different wavelengths generated by the photosynthetic freshness-retaining lamp have a certain intensity ratio. In the present embodiment, the inventors found that the ratio of the intensities of the first peak and the second peak in the light generated by the first quantum dot and the second quantum dot, respectively, is (3.5 to 7): 1, the photosynthetic fresh-keeping of the fruits and vegetables has more pertinence.
In order to achieve the above-described intensity ratio, in the present embodiment, the mass ratio of the first quantum dot and the second quantum dot in the quantum dot element is 1: (1.5 to 7).
Referring now to fig. 2, the present embodiment further discloses a photosynthetic preservation apparatus, which includes a photosynthetic preservation lamp 21 and a preservation area 23, wherein the emitted light generated by the photosynthetic preservation lamp 21 at least partially irradiates the preservation area 23. The photosynthetic freshness retaining lamp 21 may be the photosynthetic freshness retaining lamp described above. The photosynthetic fresh-keeping lamp at least comprises an excitation light source and a quantum dot element, wherein the excitation light source is used for generating excitation light, and the quantum dot element is arranged in the emitting direction of the excitation light. The quantum dot element includes a plurality of first quantum dots that absorb at least a portion of the excitation light and produce a first emission peak having a peak wavelength between 650 nanometers and 670 nanometers.
The compact crisper light is described below with several embodiments.
Example 1:
the excitation light source in the photosynthetic fresh-keeping lamp provided by the embodiment is an LED with an emission peak of 450 nm; the first quantum dots are CdZnSe/CdS/ZnS quantum dots, the particle size distribution of the CdZnSe/CdS/ZnS quantum dots is normal distribution, the expected value of the normal distribution of the particle sizes is 13.2 nanometers, and the particle size distribution coefficient is 0.49.
The photosynthetic fresh-keeping lamp is tested, the spectrum of the photosynthetic fresh-keeping lamp comprises a peak, the peak wavelength of the peak is 660 nanometers, and the half-peak width is 48 nanometers. The spectrum of the light emitted by the photosynthetic fresh-keeping lamp meets the photosynthetic fresh-keeping requirement, so that the photosynthetic fresh-keeping lamp is more pertinent when photosynthetic fresh-keeping is carried out.
Example 2:
the excitation light source in the photosynthetic fresh-keeping lamp provided by the embodiment is an LED with an emission peak of 370 nanometers; the first quantum dots are CdZnSe/CdS/ZnS quantum dots, the particle size distribution of the CdZnSe/CdS/ZnS quantum dots is normal distribution, the expected value of the normal distribution of the particle sizes is 11.3 nanometers, and the particle size distribution coefficient is 0.18. The second quantum dots are ZnSe/ZnS quantum dots. The mass ratio between the first quantum dots and the second quantum dots is 1: 1.7
The light to this photosynthetic fresh-keeping lamp tests, and its spectrum has included a crest and second crest, and the crest peak wavelength of first crest is 651 nanometers, and the half peak width of first crest 31 nanometers, the crest peak wavelength of second crest are 450 nanometers, and the peak intensity's of first crest and second crest ratio is 4.8: 1. the spectrum of the light emitted by the photosynthetic freshness retaining lamp meets the wavelength requirement of photosynthetic freshness retaining and the intensity ratio requirement of each wavelength, so that the photosynthetic freshness retaining lamp is more pertinent when photosynthetic freshness retaining is carried out.
Example 3:
in the photosynthetic fresh-keeping lamp provided by this embodiment, the excitation light source is an LED with an emission peak of 420 nm, the first quantum dots are CdZnSe/CdS/ZnS quantum dots, the particle size distribution of the CdZnSe/CdS/ZnS quantum dots is normal distribution, the normal distribution expectation value of the particle size is 13.5 nm, and the particle size distribution coefficient is 0.63; the second quantum dots are ZnSe/ZnS quantum dots. The mass ratio between the first quantum dots and the second quantum dots is 1: 5.
the light to this photosynthetic fresh-keeping lamp tests, and its spectrum has included a crest and second crest, and the crest peak wavelength of first crest is 666 nanometers, and the half peak width 58 nanometers of first crest, the crest peak wavelength of second crest are 440 nanometers, and the peak intensity's of first crest and second crest ratio is 3.5: 1. the spectrum of the light emitted by the photosynthetic freshness retaining lamp meets the wavelength requirement of photosynthetic freshness retaining and the intensity ratio requirement of each wavelength, so that the photosynthetic freshness retaining lamp is more pertinent when photosynthetic freshness retaining is carried out.
Example 4:
the excitation light source in the photosynthetic fresh-keeping lamp provided by the embodiment is an LED with an emission peak of 370 nanometers, the first quantum dots are CdZnSe/CdS/ZnS quantum dots, the particle size distribution of the CdZnSe/CdS/ZnS quantum dots is normal distribution, the expected value of the normal distribution of the particle sizes is 11.8 nanometers, and the particle size distribution coefficient is 0.20; the second quantum dots are ZnSe/ZnS quantum dots. The mass ratio between the first quantum dots and the second quantum dots is 1: 6.
the light to this photosynthetic fresh-keeping lamp tests, and its spectrum has included a crest and second crest, and the crest peak wavelength of first crest is 658 nanometers, and the half peak width 35 nanometers of first crest, and the crest peak wavelength of second crest is 450 nanometers, and the peak intensity ratio of first crest and second crest is 3.4: 1. the spectrum of the light emitted by the photosynthetic freshness retaining lamp meets the wavelength requirement of photosynthetic freshness retaining and the intensity ratio requirement of each wavelength, so that the photosynthetic freshness retaining lamp is more pertinent when photosynthetic freshness retaining is carried out.
Comparative example 1:
the comparative example provides a photosynthetic fresh-keeping lamp, the photosynthetic fresh-keeping lamp directly utilizes the light generated by the monochromatic LED as the light of the photosynthetic fresh-keeping lamp, the peak wavelength of the emission peak of the LED is 660 nanometers, and the half-peak width of the emission peak is 25 nanometers.
Comparative example 2:
this comparative example provides a photosynthetic freshness lamp, and this photosynthetic freshness lamp directly utilizes the light that first LED and second LED produced as the light of photosynthetic freshness lamp, and the peak wavelength of the emission peak of this first LED and second LED is 650 nanometers and 450 nanometers respectively, and the peak-to-peak intensity ratio of the emission peak of first LED and second LED is 4.8: 1, wherein the first LED produces an emission peak having a half-peak width of 20 nm.
Comparative example 3:
this comparative example provides a photosynthetic freshness lamp, and this photosynthetic freshness lamp directly utilizes the light that first LED and second LED produced as the light of photosynthetic freshness lamp, and the peak wavelength of the emission peak of this first LED and second LED is 665 nanometers and 440 nanometers respectively, and the peak-to-peak intensity ratio of the emission peak of first LED and second LED is 3.5: 1, wherein the first LED produces an emission peak having a half-peak width of 25 nm.
Comparative example 4:
the comparison example provides that the photosynthetic freshness lamp directly utilizes the light generated by the first LED and the second LED as the light of the photosynthetic freshness lamp, the peak wavelengths of the emission peaks of the first LED and the second LED are 660 nanometers and 450 nanometers respectively, and the ratio of the peak-to-peak intensities of the emission peaks of the first LED and the second LED is 3.4: 1, wherein the first LED produces an emission peak having a half-peak width of 25 nm.
The photosynthetic freshness-retaining lamps provided in the above examples and comparative examples were tested for their freshness-retaining ability. Placing the green vegetables in a refrigerator, performing photosynthetic preservation by using corresponding photosynthetic preservation lamps, and detecting the total chlorophyll content of the green vegetables after the green vegetables are placed in the environment for 7 days, wherein the corresponding total chlorophyll content is shown in the following table:
Figure BDA0001643488310000071
from the above table, it can be seen that the total chlorophyll content of the vegetables subjected to photosynthetic preservation by the invention is obviously higher than that of the vegetables not preserved by the photosynthetic preservation lamp of the invention, so that the preservation capability of the photosynthetic preservation lamp of the invention is better than that of the photosynthetic preservation lamp only adopting LED.
Although the present disclosure has been described and illustrated in greater detail by the inventors, it should be understood that modifications and/or alterations to the above-described embodiments, or equivalent substitutions, will be apparent to those skilled in the art without departing from the spirit of the disclosure, and that no limitations to the present disclosure are intended or should be inferred therefrom.

Claims (12)

1. A photosynthetic freshness lamp, comprising:
an excitation light source to generate excitation light;
a quantum dot element formed in the direction of emission of the excitation light, comprising a plurality of first quantum dots that absorb at least part of the excitation light and produce a first emission peak having a peak wavelength in the range of 650 nm to 670 nm, the first emission peak being capable of promoting synthesis of chlorophyll A;
the quantum dot element further comprises a plurality of second quantum dots, the plurality of second quantum dots absorb at least part of the excitation light and generate a second emission peak with a peak wavelength in a range from 440 nanometers to 470 nanometers, and the ratio of the peak intensity of the first emission peak to the intensity of the second emission peak is (3.5-7): 1, and the half-width of the first emission peak ranges from 30 nm to 60 nm.
2. A photosynthetic freshness lamp according to claim 1 wherein the half-peak width of the first emission peak is in the range of 35 nm to 50 nm.
3. A photosynthetic fresh-keeping lamp according to claim 1 or 2, wherein the plurality of first quantum dots are quantum dots with a core-shell structure, and the core of the plurality of first quantum dots is CdxZn1-xSeyS1-yThe quantum dots have x being more than or equal to 0 and less than or equal to 1, and y being more than or equal to 0 and less than or equal to 1.
4. A photosynthetic freshness lamp according to claim 3 wherein the plurality of first quantum dots are CdZnSe/CdS/ZnS quantum dots.
5. A photosynthetic freshness lamp according to claim 4, wherein the particle size distribution of the CdZnSe/CdS/ZnS quantum dots is normally distributed.
6. A photosynthetic freshness lamp according to claim 4, wherein the expected value of the particle size of the CdZnSe/CdS/ZnS quantum dots is 10 to 14 nm.
7. A photosynthetic freshness lamp according to any one of claims 4 to 6, wherein the plurality of CdZnSe/CdS/ZnS quantum dots have a particle size distribution coefficient of 0.15 to 0.65 as measured by dynamic light scattering.
8. A photosynthetic freshness-retaining lamp according to claim 7, wherein the plurality of CdZnSe/CdS/ZnS quantum dots have a particle size distribution coefficient of 0.20 to 0.50 as measured by dynamic light scattering.
9. A photosynthetic fresh-keeping lamp as claimed in claim 1, wherein the plurality of second quantum dots are quantum dots with core-shell structure, and the core of the second quantum dot is CdwZn1-wSezS1-zWherein w is more than or equal to 0 and less than or equal to 1, and z is more than or equal to 0 and less than or equal to 1.
10. A photosynthetic freshness lamp according to claim 9 wherein the plurality of second quantum dots are ZnSe/ZnS quantum dots.
11. A photosynthetic freshness-retaining lamp according to claim 1 wherein the mass ratio of the first plurality of quantum dots to the second plurality of quantum dots is 1: (1.5 to 7).
12. A photosynthetic freshness retaining device, comprising:
a freshness-retaining area;
the photosynthetic freshness keeping lamp at least partially irradiates the freshness keeping area with the emitted light; wherein, photosynthetic freshness lamp includes:
an excitation light source to generate excitation light;
a quantum dot element formed in the direction of emission of the excitation light, comprising a plurality of first quantum dots that absorb at least part of the excitation light and produce a first emission peak having a peak wavelength in the range of 650 nm to 670 nm, the first emission peak being capable of promoting synthesis of chlorophyll A;
the quantum dot element further comprises a plurality of second quantum dots, the plurality of second quantum dots absorb at least part of the excitation light and generate a second emission peak with a peak wavelength in a range from 440 nanometers to 470 nanometers, and the ratio of the peak intensity of the first emission peak to the intensity of the second emission peak is (3.5-7): 1, and the half-width of the first emission peak ranges from 30 nm to 60 nm.
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