CN113884472B - Humidity detector based on luminous color interpretation and preparation method thereof - Google Patents
Humidity detector based on luminous color interpretation and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a humidity detector based on luminescence color interpretation, which comprises an excitation light source layer and a perovskite quantum dot lamination; the excitation light source layer consists of an electroluminescent source capable of exciting the perovskite lamination; the perovskite quantum dot lamination is composed of perovskite quantum dot lamination with different sensitivity to environmental humidity, wherein perovskite quantum dot layer materials below cannot excite perovskite quantum dot layer materials above, and perovskite quantum dot materials of different layers can be excited by light emitted by an excitation light source at the bottom and mixed in an emergent process. The invention realizes humidity detection according to the judgment of the luminous color.
Description
Technical Field
The invention relates to the field of detection and display, in particular to a humidity detector based on luminescent color interpretation and a preparation method thereof.
Background
Today, the detection technology is developed very rapidly, and the detection technology has become one of the most widely applied technologies in life nowadays, and with the further development of the detection technology, the requirements for the photoelectric detector with better effect are also higher and higher, and the requirements for the detector with simple mechanism, high integration level and new material are particularly prominent. The conventional detector is composed of a plurality of parts such as a sensing module, a detection circuit and a display, however, because the components of each part are more, the integration level of the detector which is usually formed is relatively low, so that most of the detectors integrate most of the circuits through chips, and the sensors, the displays and the like are integrated in a further step through miniaturization technology, so that the highly integrated detector is realized. However, since the high-integration chip process and the miniaturized integration process are complicated and limited, a novel detection technology is urgently required and has the advantages of simple process, easy preparation, high integration level and the like.
According to the characteristic of the components of the traditional detector, the device which uses the sensing module as a detection target generally receives and detects external information, converts the external information into an electric signal according to a certain rule, transmits the electric signal to a display through a circuit to display various parameter indexes, has a complex internal mechanism, has a relatively large limitation on the application aspects of low precision requirements and wide use population, and is difficult to meet the requirement of intuitively displaying the detection result on the basis of simple mechanism. The laminated structure is widely used as a hot spot technology in various fields, however, the proposed detection technology is difficult to realize the laminated structure design of a simple detector, and few researches are conducted to design the detector by means of laminated integration.
Disclosure of Invention
Accordingly, the present invention is directed to a humidity detector based on light emitting color interpretation and a method for manufacturing the same, which can accurately realize humidity detection of light emitting color interpretation of a laminated structure.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a humidity detector based on luminescence color interpretation comprises an excitation light source layer and a perovskite quantum dot lamination; the excitation light source layer consists of an electroluminescent source capable of exciting the perovskite lamination; the perovskite quantum dot lamination is composed of perovskite quantum dot lamination with different sensitivity to environmental humidity, wherein perovskite quantum dot layer materials below cannot excite perovskite quantum dot layer materials above, and perovskite quantum dot materials of different layers can be excited by light emitted by an excitation light source at the bottom and mixed in an emergent process.
Further, the laminate structure includes, but is not limited to, a two-laminate structure.
Furthermore, the perovskite quantum dot lamination adopts physical mixing of perovskite quantum dots and polydimethylsiloxane to obtain a single-layer perovskite quantum dot polymer.
Further, the excitation light source layer includes, but is not limited to, an LED light source, an OLED, a backlight light source.
Further, the emission center wavelength of the perovskite quantum dot material belongs to a visible light wave band, the emission wavelength range is 380nm to 780nm, and the wavelength of the excitation light source belongs to any wave band conforming to the excitation color conversion layer.
The preparation method of the humidity detector based on the light-emitting color interpretation comprises the following steps:
step S1, synthesizing a plurality of perovskite quantum dots with different color conversion capacities;
step S2, different perovskite quantum dots are respectively and physically mixed with polydimethylsiloxane to form a plurality of single-layer perovskite quantum dot polymers;
step S3, stacking and bonding a single-layer perovskite quantum dot polymer, wherein the perovskite quantum dot layer material placed below should not excite the perovskite quantum dot layer material above;
s4, placing an excitation light source at the bottommost part and directly contacting with the perovskite quantum dot lamination;
and S5, preparing a shading layer on the four side walls of the laminated layer by adopting atomic layer deposition, vacuum evaporation coating and magnetron sputtering coating methods to enclose, thereby preventing surrounding ambient light from being excited.
Further, the step S2 specifically includes:
s21: dissolving perovskite quantum dots and polydimethylsiloxane together, and stirring to obtain a preparation solution;
s22: coating the preparation solution on a substrate, and placing the substrate in a curing device for heating, drying and curing;
s23: and obtaining perovskite quantum dot polymer platelet.
Further, the light shielding layer includes, but is not limited to, black photoresist, chrome, light shielding resin, carbon black.
Compared with the prior art, the invention has the following beneficial effects:
the humidity detection method can accurately realize the judgment of the luminous color of the laminated structure, and the aim of detecting the appointed target is fulfilled by utilizing the photoluminescence principle and the lamination of quantum dots with different sensitivities to carry out color mixing and taking the modes of color mixing results, color coordinate conversion and the like as display basis.
Drawings
FIG. 1 is a block flow diagram of a humidity detector structure based on luminescent color interpretation and a realization method thereof;
FIG. 2 is a schematic diagram of a typical applied structure of a humidity detector based on luminescent color interpretation according to an embodiment of the present invention, in the schematic diagram, 1 is a light shielding layer, 2 is perovskite quantum dots, 3 is a perovskite quantum dot polymer platelet, 4 is a Micro LED, and 5 is a Micro LED driving back plate;
fig. 3 is a specific explanation of the working principle of the present invention, in which 6 is a quantum dot polymer platelet layer under light source excitation, 7 is a quantum dot polymer platelet layer under light source excitation, and 8 is a quantum dot polymer platelet layer under light source non-excitation; the light after the excitation of different layers and the light not excited by the light source are emitted after the mixture of the light between the layers, and 9 is the emitted light after the mixture of the light is completed;
fig. 4 is a schematic flow chart of a preparation method of the humidity detector structure based on light emitting color interpretation, in the figure, 10 is a prepared quantum dot, 11 is a small sheet layer obtained by physically mixing and drying the quantum dot and polydimethylsiloxane, 12 is a laminated group obtained by placing and bonding small sheet laminated layers, 13 is a basic cuboid structure obtained by placing and bonding an excitation light source, and 14 is a complete structure of a plated shading layer.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 2, the present invention provides a humidity detector structure based on luminescent color interpretation and a method for manufacturing the same, in this embodiment, the humidity detector structure includes an excitation light source layer and a perovskite quantum dot lamination part, the excitation light source layer is composed of an electroluminescent source capable of exciting perovskite lamination, and the perovskite quantum dot lamination part is composed of perovskite quantum dot lamination with different sensitivity to environmental humidity; the method is characterized in that the length of a laminated layer is defined as x direction, the width of the laminated layer is defined as y direction, the thickness of the laminated layer is defined as z direction, layers are stacked in the z direction through xy planes, perovskite quantum dot layer materials placed below the laminated layer are not excited to be the perovskite quantum dot layer materials above the laminated layer materials, the perovskite quantum dot materials of different layers can be excited by light emitted by an excitation light source at the bottom, in addition, color mixing is carried out in the emergent process, and the color of output light can be used for judging the humidity of the surrounding environment.
Preferably, the ability to convert excitation light will change with changes in humidity due to the different sensitivity of the perovskite quantum dot layer to humidity, which can be achieved by varying the amount of polydimethylsiloxane by physically mixing the perovskite quantum dots with polydimethylsiloxane to give a single layer perovskite quantum dot polymer. The polymer will ensure that the perovskite quantum dots will not decompose due to excessive humidity, but rather have a critical humidity above and below which the color conversion capability will change, and the color conversion capability will change with humidity at two points:
when the humidity is lower than the critical humidity, the color conversion capability of the perovskite quantum dot layer is continuously reduced along with the increase of the humidity;
when the humidity exceeds the critical humidity, the color conversion capability of the perovskite quantum dot layer is continuously increased along with the increase of the humidity.
In this embodiment, the specific design flow of the laminate includes the following specific steps:
s1: perovskite quantum dots with different color conversion capacities are synthesized by methods such as thermal injection, ligand-assisted recrystallization and the like.
S2: different perovskite quantum dots are respectively and physically mixed with polydimethylsiloxane to form various single-layer perovskite quantum dot polymers, and the method realizes the repeatability of the humidity detector through the action of decomposition and recombination in the polymers.
S3: a plurality of single-layer perovskite quantum dot polymers are stacked and placed in the z direction through an xy plane to be bonded, and the perovskite quantum dot layer material placed below should not excite the perovskite quantum dot layer material above.
S4: the excitation light source is placed at the very bottom and is in direct contact with the perovskite quantum dot stack.
S5: the final structure is a cuboid structure, and the four side walls are provided with a shading layer for enclosing by adopting methods of atomic layer deposition, vacuum evaporation coating, magnetron sputtering coating and the like, so that the excitation of surrounding ambient light is prevented.
In an embodiment, the stacked structure includes, but is not limited to, a two-stacked layer structure, and the color weakness or change of the single-layer structure can also be used as a layer structure of the detector, and also, more than two layers of single-layer perovskite quantum dot polymers with different colors can be stacked, and the finer the color mixing result can be achieved, the finer the humidity value can be characterized.
In an embodiment, the preferred physical mixing procedure of S2 comprises the following steps:
s21: dissolving perovskite quantum dots and polydimethylsiloxane together, and stirring to obtain a preparation solution;
s22: coating the prepared solution on a substrate, and placing the substrate in a hot air circulation oven, an ultraviolet curing oven and other curing devices for heating, drying and curing;
s23: obtaining perovskite quantum dot polymer platelet;
in embodiments, preferably, the humidity sensitive perovskite quantum dot layer, including but not limited to polydimethylsiloxane, is physically mixed, and the humidity sensitivity of the perovskite quantum dot layer can be adjusted by adjusting the structure, composition, ligand or changing the polymer material, encapsulation, etc. of the perovskite quantum dot material under the condition of ensuring humidity stability. And the perovskite quantum dot layer is not the only achievable material, and luminescent materials capable of changing the luminous intensity in response to water oxygen can be replaced and used.
In an embodiment, preferably, the emission center wavelength of the perovskite quantum dot material belongs to a visible light wave band, the emission wavelength range of the perovskite quantum dot material is between 380nm and 780nm, and the excitation light source wavelength belongs to any wave band conforming to the excitation color conversion layer. The excitation light source layer disposed on the bottom layer includes, but is not limited to, an LED light source, an OLED, a backlight light source, etc., and the excitation light source may be replaced by ambient light, i.e., the emission color varies with the ambient light. It may also take the form of an excitation light source in combination with an ambient light source.
In the embodiment, preferably, the humidity detector is not limited to interpreting humidity according to the color mixing result, and according to the 1931CIE chromaticity system, color coordinates of different color mixing results are calculated through preliminary experiments and input into the external detector for display, so that detection of specific accurate humidity values can be realized; wherein the color coordinates are calculated by the following formula:
X、Y、Zthe tristimulus values in the 1931CIE chromaticity system will be given by:
wherein, the liquid crystal display device comprises a liquid crystal display device,X(λ)、Y(λ)、Z(λ) Is a three-stimulus function of the 1931CIE chromaticity system,P(λ) As a function of the distribution of relative spectral energy. Wherein, the liquid crystal display device comprises a liquid crystal display device,P(λ) The combination is calculated from the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,Nrepresenting the center wavelengths of the red, green and blue relative spectra,Mthe slit width representing the relative spectrum of the red, green and blue colors,Ais the luminous intensity coefficient, andAthe value of (2) is affected by the ambient humidity.
In an embodiment, it is preferred that the light shielding layer surrounding the device for the enclosure includes, but is not limited to, black photoresist, chrome, light shielding resin, carbon black, and the like. Furthermore, the detector can also be an array structure, namely, the detector consists of a plurality of independent detectors, each detector can measure the humidity value of the area, and at the moment, a shielding and shading layer is also required to be arranged between the detectors to prevent crosstalk.
In the embodiment, the detector is preferably not limited to the detection of single humidity, and the integrated detection device of temperature, humidity and luminosity can be realized by changing the thermal sensitivity and the light sensitivity of the perovskite quantum dot material and increasing the color compensation schemes of the lamination layer number, different interlayer designs, the lamination sequence and the like.
Example 1:
in this embodiment, the specific design of the humidity detector structure includes the following steps:
firstly, the lamination group is set to be of a two-lamination-layer structure, namely a red perovskite quantum dot polymer small-piece layer and a green perovskite quantum dot polymer small-piece layer, an excitation light source is a blue Micro LED, and the specific process comprises the following manufacturing steps:
s1: perovskite quantum dots with different color conversion capacities are synthesized by methods such as thermal injection, ligand-assisted recrystallization and the like.
S2: different perovskite quantum dots are respectively and physically mixed with polydimethylsiloxane to form two single-layer perovskite quantum dot polymers, and the method realizes the repeatability of the humidity detector through the action of decomposition and recombination in the polymers.
S3: the two layers of single-layer perovskite quantum dot polymers are stacked and placed in the z direction through the xy plane to be adhered, according to the principle that the lower layer should not excite the perovskite quantum dot layer material of the upper layer, the lower layer is placed below the red perovskite quantum dot polymer platelet, and the upper layer is placed above the green perovskite quantum dot polymer platelet.
S4: the excitation light source is placed at the very bottom and is in direct contact with the perovskite quantum dot stack.
S5: the final structure is a cuboid structure, and four side walls are surrounded by a shading layer prepared by adopting methods of atomic layer deposition, vacuum evaporation coating, magnetron sputtering coating and the like, so that surrounding ambient light is prevented from being excited.
In this embodiment, the physical mixing procedure of S2 includes the following steps:
s21: dissolving perovskite quantum dots and polydimethylsiloxane together, and stirring to obtain a preparation solution;
s22: coating the prepared solution on a substrate, and placing the substrate in a hot air circulation oven, an ultraviolet curing oven and other curing devices for heating, drying and curing;
s23: obtaining perovskite quantum dot polymer platelet;
in the specific embodiment, in order to detect data with higher precision, color coordinates of different color mixing results are calculated through experiments in advance and input into an external detector for display, so that detection of specific accurate humidity values is realized; wherein the color coordinates are calculated by the following formula:
X、Y、Zrepresentation in 1931CIE chromaticity SystemThe tristimulus values of (2) will be given by:
wherein, the liquid crystal display device comprises a liquid crystal display device,X(λ)、Y(λ)、Z(λ) Is a three-stimulus function of the 1931CIE chromaticity system,P(λ) As a function of the distribution of relative spectral energy. Wherein, the liquid crystal display device comprises a liquid crystal display device,P(λ) The combination is calculated from the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,Nrepresenting the center wavelengths of the red, green and blue relative spectra,Mthe slit width representing the relative spectrum of the red, green and blue colors,Ais the luminous intensity coefficient, andAthe value of (2) is affected by the ambient humidity.
To ensure the accuracy of the values byMATLABAnd compensating the measured color coordinates by using certain color coordinate data to reduce errors.
The obtained humidity detector can perform better humidity detection, when the accuracy is required to be lower, the change trend of the humidity can be intuitively observed only through color change, and when the accuracy is required to be higher, accurate and reliable detection data can be obtained through connecting output data equipment.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (4)
1. The humidity detector based on the luminescence color interpretation is characterized by comprising an excitation light source layer and a perovskite quantum dot lamination; the excitation light source layer consists of an electroluminescent source capable of exciting the perovskite lamination; the perovskite quantum dot lamination is formed by laminating perovskite quantum dots with different sensitivity to environmental humidity, wherein the perovskite quantum dot layer material below cannot excite the perovskite quantum dot layer material above, and the perovskite quantum dot materials of different layers can be excited by light emitted by an excitation light source at the bottom and mixed in the emergent process;
the laminated structure comprises a two-layer laminated structure;
the perovskite quantum dot lamination adopts physical mixing of perovskite quantum dots and polydimethylsiloxane to obtain a single-layer perovskite quantum dot polymer;
the emission center wavelength of the perovskite quantum dot material belongs to a visible light wave band, the emission wavelength range of the perovskite quantum dot material is 380nm to 780nm, and the wavelength of an excitation light source belongs to any wave band conforming to an excitation color conversion layer.
2. The luminescent color interpretation based humidity detector of claim 1 wherein the excitation light source layer comprises an LED light source, an OLED, a backlight light source.
3. A method of manufacturing a luminescent color interpretation based humidity detector as claimed in claim 1, comprising the steps of:
step S1, synthesizing a plurality of perovskite quantum dots with different color conversion capacities;
step S2, different perovskite quantum dots are respectively and physically mixed with polydimethylsiloxane to form a plurality of single-layer perovskite quantum dot polymers;
step S3, stacking and bonding a single-layer perovskite quantum dot polymer, wherein the perovskite quantum dot layer material placed below should not excite the perovskite quantum dot layer material above;
s4, placing an excitation light source at the bottommost part and directly contacting with the perovskite quantum dot lamination;
s5, preparing a shading layer on four side walls of the laminated layer by adopting atomic layer deposition, vacuum evaporation coating and magnetron sputtering coating methods to enclose, so as to prevent surrounding ambient light from being excited;
the step S2 specifically comprises the following steps:
s21: dissolving perovskite quantum dots and polydimethylsiloxane together, and stirring to obtain a preparation solution;
s22: coating the preparation solution on a substrate, and placing the substrate in a curing device for heating, drying and curing;
s23: and obtaining perovskite quantum dot polymer platelet.
4. The method for manufacturing a humidity sensor based on light emitting color interpretation according to claim 3, wherein the light shielding layer comprises black photoresist, chrome, light shielding resin, carbon black.
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