KR20210023767A - Color conversion film, scintillator and x-ray detector including the same - Google Patents

Abstract

The present invention provides a color conversion film. The color conversion film comprises: perovskite nanoparticles represented by a chemical formula 1; and a luminescent dye. When light is irradiated, the emission peak having the maximum height is within 540 to 580 nm.

Description

Color conversion film, scintillator and X-ray detector including the same {COLOR CONVERSION FILM, SCINTILLATOR AND X-RAY DETECTOR INCLUDING THE SAME}

This application claims the benefit of the filing date of the Korean Patent Application No. 10-2019-0102980 filed with the Korean Intellectual Property Office on August 22, 2019, the entire contents of which are incorporated herein.

The present specification relates to a color conversion film, a scintillator including the same, and an X-ray detector.

Recently, X-ray detectors such as FPXD (Flat Panel X-ray Detector) have been developed and are widely used in medical and industrial fields.

The X-ray detector outputs an X-ray image captured by X-rays or an X-ray perspective image as a digital signal. These X-ray detectors are divided into a direct method (direct conversion method) and an indirect method (indirect conversion method).

The direct method converts X-rays into electric charges directly in a photoconductor, and the indirect method converts X-rays into visible light in a scintillator, and then converts the converted visible light into photoelectricity such as a photodiode. It is a method of converting electric charges through the device.

Since the photodiode used in the indirect method has maximum sensitivity in a wavelength range of 540 nm to 560 nm, research on a scintillator that emits light in a wavelength range of 540 nm to 560 nm is being conducted.

As an example, research is being conducted to control a light emitting area by adding a perovskite material to a color conversion film included in a scintillator. In the perovskite material containing a halogen element, as the content of iodine (I) increases, an emission spectrum close to 540 nm to 560 nm is exhibited. However, when iodine is included, there is a problem in that the luminous efficiency decreases and the stability of the perovskite nanoparticles decreases. Accordingly, there is a need for a study on a color conversion film capable of increasing luminous efficiency while having an emission spectrum close to 540nm to 560nm.

Korean Application Publication No. 2017-0051463

This specification is It relates to a color conversion film, a scintillator including the same, and an X-ray detector.

An exemplary embodiment of the present specification is perovskite nanoparticles represented by the following Chemical Formula 1; And

As a color conversion film containing a luminescent dye,

The color conversion film provides a color conversion film in which, when irradiated with light, an emission peak having a maximum height is within 540 nm to 580 nm.

[Formula 1]

R1M1Br _a I _b

In Formula 1,

R1 is C _n H _{2n + 1} NH ₃ ⁺ , NH ₄ ⁺ , HC(NH ₂ ) ₂ ⁺ , Cs ⁺ , NF ₄ ⁺ , NCl ₄ ⁺ , PF ₄ ⁺ , PCl ₄ ⁺ , CH ₃ PH ₃ ⁺ , CH _It is a monovalent cation selected from 3 AsH ₃ ⁺ , CH ₃ SbH ₃ ⁺ , PH ₄ ⁺ , AsH ₄ ⁺ and SbH ₄ ^+,

M1 is Cu ^{2 +} , Ni ^{2 +} , Co ^{2 +} , Fe ^{2 +} , Mn ^{2 +} , Cr ^{2 +} , Pd ^{2 +} , Cd ^{2 +} , Ge ^{2 +} , Sn ^{2 +} , Bi ^{2 +} , Pb ^{2 +} and It is a divalent metal ion selected from ^{Yb 2+,}

n is an integer from 1 to 9,

a is a real number of 0<a≤3,

b is a real number of 0≤b<3,

a+b is 3,

The molar ratio of a and b is 1:0 to 0.7:0.3.

Another exemplary embodiment of the present specification provides a scintillator including the color conversion film.

Another exemplary embodiment of the present specification provides an X-ray detector including the scintillator.

In the color conversion film according to an exemplary embodiment of the present specification, an emission peak having a maximum height exists within 540nm to 580nm. Accordingly, it is possible to manufacture a scintillator optimized for an amorphous silicon photodetector, and as a result, it is possible to improve sensitivity.

1 is a diagram showing a measurement result of an emission spectrum of a color conversion film prepared in an example of the present specification.
2 is a view showing a light emission state when UV irradiation of the color conversion film prepared in the embodiment of the present specification.

An exemplary embodiment of the present specification is perovskite nanoparticles represented by the following Chemical Formula 1; And

As a color conversion film containing a luminescent dye,

The color conversion film provides a color conversion film in which, when irradiated with light, an emission peak having a maximum height is within 540 nm to 580 nm.

[Formula 1]

R1M1Br _a I _b

In Formula 1,

R1 is C _n H _{2n + 1} NH ₃ ⁺ , NH ₄ ⁺ , HC(NH ₂ ) ₂ ⁺ , Cs ⁺ , NF ₄ ⁺ , NCl ₄ ⁺ , PF ₄ ⁺ , PCl ₄ ⁺ , CH ₃ PH ₃ ⁺ , CH _It is a monovalent cation selected from 3 AsH ₃ ⁺ , CH ₃ SbH ₃ ⁺ , PH ₄ ⁺ , AsH ₄ ⁺ and SbH ₄ ^+,

M1 is Cu ^{2 +} , Ni ^{2 +} , Co ^{2 +} , Fe ^{2 +} , Mn ^{2 +} , Cr ^{2 +} , Pd ^{2 +} , Cd ^{2 +} , Ge ^{2 +} , Sn ^{2 +} , Bi ^{2 +} , Pb ^{2 +} and It is a divalent metal ion selected from ^{Yb 2+,}

n is an integer from 1 to 9,

a is a real number of 0<a≤3,

b is a real number of 0≤b<3,

a+b is 3,

The molar ratio of a and b is 1:0 to 0.7:0.3.

When the color conversion film contains only a luminescent dye, there is a problem in that the luminescent dye cannot function as a scintillator because it cannot absorb high energy. On the other hand, an exemplary embodiment of the present specification can be applied as a scintillator by simultaneously using a luminescent dye and perovskite nanoparticles.

Meanwhile, since the emission spectrum of the perovskite material having high luminous efficiency is generally in the range of 480 nm to 540 nm, it deviates from 540 nm to 560 nm, which is the region where the sensitivity of the amorphous silicon photodetector is the largest. Therefore, when the color conversion film contains only perovskite nanoparticles, there is a problem in that the sensitivity of the amorphous silicon photodetector is deteriorated.

The color conversion film according to the exemplary embodiment of the present specification includes perovskite nanoparticles and a luminescent dye, so that a luminescence peak having a maximum height when irradiated with light exists within 540nm to 580nm. Accordingly, it is possible to manufacture a scintillator optimized for an amorphous silicon photodetector, and as a result, it is possible to improve sensitivity.

In the present specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

In the exemplary embodiment of the present specification, when the light-emitting dye is irradiated with light, an emission peak having a maximum height is present within 540nm to 580nm.

In the exemplary embodiment of the present specification, when the perovskite nanoparticles are irradiated with light, an emission peak having a maximum height is present within 480nm to 540nm.

In the exemplary embodiment of the present specification, the color conversion film has a maximum height including perovskite nanoparticles exhibiting a maximum emission wavelength range at a relatively short wavelength and a light emitting dye exhibiting a maximum emission wavelength range at a relatively long wavelength. The emission peak range was adjusted to exist within 540 nm to 580 nm.

That is, the color conversion film simultaneously includes perovskite nanoparticles having a maximum emission wavelength within 480 nm to 540 nm and the luminescent dye having a maximum emission wavelength within 540 nm to 580 nm, so that the emission peak having the maximum height is 540 nm. To 580nm.

In the exemplary embodiment of the present specification, the emission wavelength range having the maximum height of the perovskite nanoparticles may be different depending on the type and ratio of the halogen element contained in the perovskite nanoparticles.

Specifically, when only chlorine (Cl) is contained among the halogen elements, the color conversion film emits blue light. When only bromine (Br) is contained among the halogen elements, the color conversion film emits green light. When only iodine (I) is contained among the halogen elements, the color conversion film emits red light.

In addition, when two types of halogen elements are mixed and contained, the maximum emission wavelength range differs depending on the ratio of the contained halogen elements. For example, when bromine and iodine are mixed and contained among halogen elements, the maximum emission wavelength exists between green light and red light. In this case, when the bromine content is higher than iodine, the maximum emission wavelength is closer to green light than to red light.

In the present specification, definitions known in the art may be used for blue light, green light and red light. For example, blue is light having a wavelength selected from a wavelength of 400 nm to 500 nm, green light is light having a wavelength selected from a wavelength of 500 nm to 560 nm, and red light is light having a wavelength selected from a wavelength of 600 nm to 780 nm to be.

In the exemplary embodiment of the present specification, by adjusting the molar ratio of a and b in Formula 1, the range of the emission peak having the maximum height among the wavelength range in which the perovskite nanoparticles emit light was adjusted. Specifically, by adjusting the molar ratio of a and b in Formula 1 to 1:0 to 0.7:0.3, the range of the emission peak having the maximum height of the perovskite nanoparticles was 480nm to 540nm.

In the exemplary embodiment of the present specification, the "luminescence peak having a maximum height" refers to a wavelength range in which the maximum height peak appears in an emission spectrum measured through a photoluminescence (PL) measuring device. Specifically, it can be measured in the following way. First, a desired excitation light is generated by passing light from a multicolor light source (eg, Xenon Arc Lamp) through a monochromator. In this specification, excitation light of 365 nm wavelength was used. When the generated excitation light is irradiated onto the sample, it can be seen that light of a color different from the excitation light is emitted, which is the light generated by the photoluminescence phenomenon. By sending this back to a monochromatic light and recording the intensity of each wavelength, a spectrum by photoluminescence can be obtained.

In the exemplary embodiment of the present specification, the average size of the perovskite nanoparticles is 10nm to 20nm.

In the present specification, the average size of the perovskite nanoparticles means an average value of the maximum particle diameter of each of the perovskite nanoparticles included in the color conversion film. The average size of the perovskite nanoparticles can be measured through a scanning electron microscope (SEM).

In the exemplary embodiment of the present specification, the range of the emission peak having the maximum height is different according to the average size of the perovskite nanoparticles.

In the exemplary embodiment of the present specification, as the average size of the perovskite nanoparticles increases, the range of the emission peak having the maximum height moves toward a longer wavelength.

In an exemplary embodiment of the present specification, by adjusting the average size of the perovskite nanoparticles to 10 nm to 20 nm, the emission peak having the maximum height is 480 nm to 540 nm.

In the exemplary embodiment of the present specification, as the luminescent dye, Rhodamin-based dyes, (typically Rhodamin 6G and Rhodamin B), organic phosphors having a BODIPY core (typically Pyrometene 597, PM570, PM596), and other Orange-based phosphors Can be used.

In the exemplary embodiment of the present specification, the wavelength range of light irradiated to the color conversion film expressed as "when irradiated with light" may be in the range of 10KVp to 200KVp based on a tube voltage.

In one embodiment of the present specification, the color conversion film further includes a resin matrix. Specifically, the color conversion film is a resin matrix; And perovskite nanoparticles and luminescent dyes dispersed in the resin matrix.

In one embodiment of the present specification, it is preferable that the material of the resin matrix is a thermoplastic polymer or a thermosetting polymer. Specifically, materials for the resin matrix include poly(meth)acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate (PC) resins, polystyrene (PS) resins, and polyarylene (PAR) resins. , Polyurethane (TPU)-based resin, styrene-acrylonitrile (SAN)-based resin, polyvinylidene fluoride (PVDF)-based resin, and modified polyvinylidene fluoride (modified-PVDF)-based resin, etc. may be used. . Specifically, the resin matrix may be polyvinylidene fluoride.

In the exemplary embodiment of the present specification, the color conversion film may include 0.005 parts by weight to 10 parts by weight based on 100 parts by weight of the resin matrix solid content of the perovskite nanoparticles. More specifically, the perovskite nanoparticles may include 0.05 parts by weight to 5 parts by weight based on 100 parts by weight of the solid content of the resin matrix.

In the exemplary embodiment of the present specification, the color conversion film may include 0.005 parts by weight to 10 parts by weight based on 100 parts by weight of the resin matrix solid content of the light-emitting dye. More specifically, the luminescent dye may include 0.05 parts by weight to 5 parts by weight based on 100 parts by weight of the solid content of the resin matrix.

In the exemplary embodiment of the present specification, the weight ratio of the perovskite nanoparticles and the luminescent dye included in the color conversion film is 1:0.001 to 1:0.5. When the weight ratio satisfies the above range, effective color conversion is possible.

In the exemplary embodiment of the present specification, the color conversion film may have a thickness of 1 μm to 1,000 μm. Specifically, the color conversion film may have a thickness of 5 μm to 500 μm. When the thickness of the color conversion film satisfies the above range, irradiation light can be effectively absorbed.

In the exemplary embodiment of the present specification, the color conversion film may be prepared by applying a solution containing a resin matrix, perovskite nanoparticles, and a luminescent dye on a substrate, followed by drying.

In the exemplary embodiment of the present specification, if the solution is in a state in which the above-described perovskite nanoparticles, luminescent dye, and resin are dissolved in the solution, the manufacturing method is not particularly limited. For example, the solution is a method of preparing a first solution by dissolving perovskite nanoparticles and a resin matrix in a solvent, dissolving a luminescent dye in a solvent to prepare a second solution, and then mixing the first solution and the second solution. It can be manufactured by When mixing the first solution and the second solution, it is preferable to mix uniformly. However, the method of preparing the solution is not limited thereto, and a method of dissolving by simultaneously adding perovskite nanoparticles, a luminescent dye, and a resin to a solvent; A method of dissolving perovskite nanoparticles in a solvent and then sequentially adding a luminescent dye and a resin to dissolve it may be used.

The solvent is not particularly limited as long as it can be removed by drying later without adversely affecting the coating process. Non-limiting examples of the solvent include toluene, xylene, acetone, chloroform, various alcohol solvents, MEK (methyl ethyl ketone), MIBK (methyl isobutyl ketone), EA (ethyl acetate), butyl acetate, DMF (dimethylform). Amide), DMAc (dimethylacetamide), DMSO (dimethyl sulfoxide), NMP (N-methyl-pyrrolidone), and the like may be used, and one or two or more may be used in combination. When using the first solution and the second solution, the solvent contained in each of these solutions may be the same or different. Even when different types of solvents are used for the first solution and the second solution, it is preferable that these solvents have compatibility so that they can be mixed with each other.

In the exemplary embodiment of the present specification, the solution may contain perovskite as a perovskite precursor, not in the form of nanoparticles. That is, the solution may include a perovskite precursor, a luminescent dye, and a resin matrix.

In the present specification, "precursor" refers to a substance in a stage before becoming a specific substance in a certain metabolism or reaction. For example, the perovskite precursor refers to a material at a stage before becoming a compound having a perovskite structure or a material at a stage before becoming a perovskite nanoparticle of Formula 1 above.

For example, in the exemplary embodiment of the present specification, the solution may include a metal halide and an organic halide, respectively.

In an exemplary embodiment of the present specification, the organohalide is represented by the following formula (2).

[Formula 2]

R1X1

In Formula 2,

R1 is C _n H _{2n + 1} NH ₃ ⁺ , NH ₄ ⁺ , HC(NH ₂ ) ₂ ⁺ , Cs ⁺ , NF ₄ ⁺ , NCl ₄ ⁺ , PF ₄ ⁺ , PCl ₄ ⁺ , CH ₃ PH ₃ ⁺ , CH _It is a monovalent cation selected from 3 AsH ₃ ⁺ , CH ₃ SbH ₃ ⁺ , PH ₄ ⁺ , AsH ₄ ⁺ and SbH ₄ ^+,

X1 is Br ^- or I ^- .

In an exemplary embodiment of the present specification, the metal halide is represented by Formula 3 below.

[Formula 3]

M1(X2) ₂

In Formula 3,

M1 is Cu ^{2 +} , Ni ^{2 +} , Co ^{2 +} , Fe ^{2 +} , Mn ^{2 +} , Cr ^{2 +} , Pd ^{2 +} , Cd ^{2 +} , Ge ^{2 +} , Sn ^{2 +} , Bi ^{2 +} , Pb ^{2 +} and It is a divalent metal ion selected from ^{Yb 2+,}

X2 is Br ^- or I ^- .

In the exemplary embodiment of the present specification, at least one of X1 and X2 includes Br ^- .

In the exemplary embodiment of the present specification, X1 is Br ^- and X2 is I ^- . In this case, the contents of the metal halide and the organic halide in the solution may be adjusted so that the molar ratio of X1 and X2 satisfies 1:0 to 0.7:0.3.

In the exemplary embodiment of the present specification, X1 is I ^- and X2 is Br ^-In this case, the molar ratio of X1 and X2 is 0.3:0.7 to 0:1. The content can be adjusted.

In the exemplary embodiment of the present specification, X1 and X2 are each Br ⁻ .

That is, in an exemplary embodiment of the present specification, the content of the organic halide and the metal halide may be adjusted so that the molar ratio ^{of Br-} and I ^{-in the halogen element included in the perovskite satisfies 1:0 to 0.7:0.3.} .

In the exemplary embodiment of the present specification, R1 is C _n H _{2n + 1} NH ₃ ⁺ , HC(NH ₂ ) ₂ ⁺ or Cs ⁺ .

In the exemplary embodiment of the present specification, M1 is Pb ^{2 +} .

In the exemplary embodiment of the present specification, the solution is a process in which a metal halide and an organic halide are mixed in a solution, and/or in the process of drying after the solution is applied on a substrate, the perovskite precursor materials are perovskite. It can be changed to nanoparticles (perovskite crystal form).

An exemplary embodiment of the present specification provides a scintillator including the color conversion film.

In the exemplary embodiment of the present specification, the scintillator serves to emit visible light by absorbing energy of incident radiation such as X-rays.

An exemplary embodiment of the present specification is that the color conversion film does not include a luminescent dye alone, but simultaneously includes a luminescent dye and perovskite nanoparticles, thereby absorbing the energy of incident radiation such as X-rays and emitting visible light. have. Therefore, the color conversion film according to an exemplary embodiment of the present specification can be applied to a scintillator. In this case, an exemplary embodiment of the present specification may emit light in a wavelength range of 540 nm to 580 nm by including the color conversion film described above.

An exemplary embodiment of the present specification provides an X-ray detector including the scintillator.

In the exemplary embodiment of the present specification, the X-ray detector includes a substrate, a scintillator, and a photo detector.

Specifically, the X-ray detector may have a layered structure including a substrate, a TFT array provided on the substrate, a photo detector provided on the TFT array, and a scintillator provided on the photo detector.

In another exemplary embodiment of the present specification, the X-ray detector includes: a photo detector including a photodetector side substrate and a photoelectric conversion layer; And a scintillator panel including a scintillator and a scintillator-side substrate.

Specifically, the X-ray detector includes a photodetector side substrate, a photoelectric conversion layer formed on the photoelectric conversion layer, a scintillator layer formed on the photoelectric conversion layer, and a scintillator-side substrate formed on the scintillator layer. Can be

In the present specification, when a member is said to be positioned "on" another member, this includes not only the case where the member is in contact with the other member, but also the case where another member exists between the two members.

In the exemplary embodiment of the present specification, materials used in the art may be used as the photodetector-side substrate and the photoelectric conversion layer. For example, an insulating substrate such as glass, ceramic, or resin may be used as the substrate on the photo detector side.

In the exemplary embodiment of the present specification, the photodetector may be a photodiode.

In the exemplary embodiment of the present specification, the photodiode may be an amorphous silicon photodiode.

In the case of an amorphous silicon photodiode, the wavelength region having the maximum sensitivity is 540 nm to 560 nm, and an exemplary embodiment of the present specification is that the scintillator includes the color conversion film described above, so that the photodiode has an emission spectrum in the wavelength region showing the maximum sensitivity. Can be formed. Accordingly, it has an effect of improving the sensitivity of the photodiode and the X-ray detector.

In the exemplary embodiment of the present specification, the scintillator layer is made of the above-described scintillator, and several scintillators may be provided at regular intervals. For example, several scintillators may be provided with a partition wall therebetween.

In the exemplary embodiment of the present specification, the scintillator-side substrate is preferably a material having high transmission of radiation, and any material used in the art may be used without limitation. For example, plate glass made of glass such as borosilicate glass and chemically strengthened glass; Ceramic substrates made of ceramics such as sapphire, silicon nitride, and silicon carbide; A semiconductor substrate made of a semiconductor such as silicon, germanium, gallium arsenide, gallium phosphorus, and gallium nitrogen; Polymer films or plastic films such as cellulose acetate film, polyester film, polyethylene terephthalate film, polyamide film, polyimide film, and polycarbonate film; Metal sheets such as aluminum sheets, iron sheets, and copper sheets; A metal sheet having a coating layer of metal oxide; And a material selected from the group consisting of carbon substrates may be used. Specifically, a plastic film and a plate glass may be used in terms of flatness and heat resistance.

In the exemplary embodiment of the present specification, in addition to the X-ray detector, layers used in the art may be applied. For example, a radiation shielding layer or a reflective layer may be applied.

In the case of the radiation shielding layer, a material having a radiation shielding function may be used to prevent radiation from being emitted to the outside of the X-ray detector. Specifically, metal plates such as iron lead and lead plate; And a glass plate containing metals such as iron, lead, gold, silver, copper, platinum, tungsten, molybdenum, etc. may be used.

In the exemplary embodiment of the present specification, the radiation shielding layer is provided between the scintillator layer and the scintillator-side substrate.

Hereinafter, examples will be described in detail in order to describe the present specification in detail. However, the embodiments according to the present specification may be modified in various forms, and the scope of the present specification is not construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more completely describe the present specification to those of ordinary skill in the art.

Example 1

Into 5 mL of dimethylformamide (DMF), 10 mg _{of CH 3} NH _{3 Br and 30 mg of PbBr 2} were added and stirred until completely dissolved. A first solution was prepared by adding 0.86 g of polyvinylidene fluoride (PVDF) to the solution and stirring until completely dissolved.

A second solution was prepared by adding a luminescent dye (Rhodamine 6G) at a concentration of 2 mg per 1 mL of DMF and stirring until completely dissolved.

1 mL of the second solution was added to the first solution and mixed using a magnetic stirrer to prepare a third solution in which the two solutions were completely mixed.

The alkali-free glass substrate was washed with acetone and isopropyl alcohol, and then dried in an oven at 100°C. _{UVO 3} for 30 minutes on the dried substrate surface After treatment, the third solution was spin-coated at 500 rpm for 30 seconds. Then, it was put in a vacuum oven at room temperature and dried under vacuum conditions for 10 minutes to prepare a color conversion film.

Comparative Example 1.

Into 5 mL of dimethylformamide (DMF), 10 mg _{of CH 3} NH _{3 Br and 30 mg of PbBr 2} were added and stirred until completely dissolved. 0.86 g of polyvinylidene fluoride (PVDF) was added to the solution and stirred until completely dissolved to prepare a solution in which a perovskite precursor and a resin matrix were dissolved.

The alkali-free glass substrate was washed with acetone and isopropyl alcohol, and then dried in an oven at 100°C. _{UVO 3} for 30 minutes on the dried substrate surface After treatment, the solution was spin-coated at 500 rpm for 30 seconds. Then, it was put in a vacuum oven at room temperature and dried under vacuum conditions for 10 minutes to prepare a color conversion film.

Comparative Example 2.

A solution in which the luminescent dye was dissolved was prepared by putting the luminescent dye (Rhodamine 6G) at a concentration of 2 mg in 1 mL of DMF and stirring until completely dissolved.

The alkali-free glass substrate was washed with acetone and isopropyl alcohol, and then dried in an oven at 100°C. _{UVO 3} for 30 minutes on the dried substrate surface After treatment, the solution was spin-coated at 500 rpm for 30 seconds. Then, it was put in a vacuum oven at room temperature and dried under vacuum conditions for 10 minutes to prepare a color conversion film.

Experimental example. Emission spectrum measurement

After irradiating a Handheld UV lamp (365nm), the emission spectrum was measured using a spectroradiometer, and the results are shown in FIG. 1.

1, the maximum emission wavelength of Comparative Example 1 containing only perovskite nanoparticles is in a relatively short wavelength range (about 480 nm to 540 nm), and the maximum emission wavelength of Comparative Example 2 using only luminescent dye is relatively long wavelength. It can be seen that it is in the range (about 540m to 580nm).

In addition, in the case of the absorption peak, it can be seen that only the absorption peak of Comparative Example 2 appears while the absorption peak of Example 1 does not appear within the measurement wavelength range.

On the other hand, in the case of the emission peak, it can be seen that the maximum emission wavelength of Example 1 is present at 540 nm to 580 nm similar to Comparative Example 2.

Through this, it can be seen that in the color-changed film according to the exemplary embodiment of the present specification, all of the light emitted from perovskite is absorbed by the light emitting dye and converted into light emission energy. In addition, it can be seen that the color conversion film exhibits an optimized emission wavelength range for the amorphous silicon photodetector by using the perovskite nanoparticles and the luminescent dye together.

2 shows the light emission of the films prepared in Example 1 and Comparative Example 1 upon UV irradiation.

2, while the color conversion film of Comparative Example 1 including only perovskite nanoparticles exhibited a relatively short wavelength blue, the color conversion of Example 1 including both perovskite nanoparticles and luminescent dye It can be seen that the film exhibits a relatively long wavelength yellowish green.

Claims (7)

Perovskite nanoparticles represented by the following formula (1); And
As a color conversion film containing a luminescent dye,
When the color conversion film is irradiated with light, a color conversion film in which the emission peak having a maximum height is within 540nm to 580nm:
[Formula 1]
R1M1Br _a I _b
In Formula 1,
R1 is C _n H _{2n + 1} NH ₃ ⁺ , NH ₄ ⁺ , HC(NH ₂ ) ₂ ⁺ , Cs ⁺ , NF ₄ ⁺ , NCl ₄ ⁺ , PF ₄ ⁺ , PCl ₄ ⁺ , CH ₃ PH ₃ ⁺ , CH _It is a monovalent cation selected from 3 AsH ₃ ⁺ , CH ₃ SbH ₃ ⁺ , PH ₄ ⁺ , AsH ₄ ⁺ and SbH ₄ ^+,
M1 is Cu ^{2 +} , Ni ^{2 +} , Co ^{2 +} , Fe ^{2 +} , Mn ^{2 +} , Cr ^{2 +} , Pd ^{2 +} , Cd ^{2 +} , Ge ^{2 +} , Sn ^{2 +} , Bi ^{2 +} , Pb ^{2 +} and It is a divalent metal ion selected from ^{Yb 2+,}
n is an integer from 1 to 9,
a is a real number of 0<a≤3,
b is a real number of 0≤b<3,
a+b is 3,
The molar ratio of a and b is 1:0 to 0.7:0.3. The method according to claim 1,
The color conversion film that the average size of the perovskite nanoparticles is 10nm to 20nm. The method according to claim 1,
When the perovskite nanoparticles are irradiated with light, a color conversion film having an emission peak having a maximum height of 480nm to 540nm. The method according to claim 1,
When the light-emitting dye is irradiated with light, a color conversion film having an emission peak having a maximum height of 540 nm to 580 nm. The method according to claim 1,
The color conversion film further comprising a resin matrix. A scintillator comprising the color conversion film according to any one of claims 1 to 5. An X-ray detector comprising the scintillator according to claim 6.

Images