WO2008029633A1

WO2008029633A1 - Color conversion substrate and method for producing the same

Info

Publication number: WO2008029633A1
Application number: PCT/JP2007/066405
Authority: WO
Inventors: Satoshi Hachiya; Mitsuru Eida
Original assignee: Idemitsu Kosan Co., Ltd.
Priority date: 2006-09-07
Filing date: 2007-08-24
Publication date: 2008-03-13
Also published as: TW200829076A

Abstract

Disclosed is a color conversion substrate (10) comprising a base (11) and a color conversion portion (30) arranged on the base (11). The color conversion portion (30) includes color conversion films (17, 18) containing a photoluminescent inorganic nanocrystal and a transparent protective layer (19), which are sequentially arranged on the base (11) in this order.

Description

Specification

Color conversion substrate and manufacturing method thereof

Technical field

The present invention relates to a color conversion substrate and a manufacturing method thereof. In particular, the present invention relates to a color conversion substrate having sufficient color conversion performance even with a thin film.

Background art

[0002] Light from a light emitting element such as an organic EL (electric mouth luminescence) element is converted into light of other wavelengths by a color conversion film to obtain light of the three primary colors of blue, green, and red. A technique for obtaining a display is known.

[0003] Full-color displays using a color conversion material in which photoluminescent inorganic nanocrystals are blended in a color conversion film are already known.

When a film containing a color conversion material is formed on a substrate and used as a color conversion film, it is impossible to form a film having practical strength with only photoluminescent inorganic nanocrystals! Therefore, a technique for producing a color conversion film by applying a composition containing a binder material or a polymerizable substance onto a substrate has been reported.

[0004] However, in order for the photoluminescent inorganic nanocrystal dispersed in the matrix to sufficiently absorb the light from the light source, the color conversion film has to be thicker than 10 m.

[0005] Further, when a full color display using a color conversion film is manufactured, it is necessary to pattern the color conversion film according to the shape of the pixel, and it is necessary to form the color conversion film in a thick film. Therefore, it is preferable to apply a photolithography method or a screen printing method to the production of the color conversion film. However, the photolithography method has a problem that the material utilization efficiency is low, and the screen printing method has a problem in pattern accuracy.

[0006] On the other hand, both the material utilization efficiency and the pattern accuracy are high, and the inkjet method is known as a printing method. However, in order to form a thick film of 10 m or more, it is necessary to reapply many times and produce it. The efficiency is low.

[0007] Patent Document 1 is characterized by comprising semiconductor nanoparticles, a solvent, and a polymerizable monomer. A photopolymerizable resin composition is disclosed.

However, it is necessary to increase the film thickness in order to sufficiently absorb light from a light source having a low content of semiconductor nanoparticles of 0.1 wt% to 20 wt% in the composition.

[0008] Patent Document 2 discloses a coating composition comprising a polymerizable component, semiconductor ultrafine particles, and a solvent.

Although it is possible to form a layer containing a photoluminescent inorganic nanocrystal from this composition, the composition is formed between the time when the coating composition is applied on the substrate and the time when the polymerizable component is polymerized. Since it is easy to flow, it was difficult to accurately form a layer containing a photoluminescent inorganic nanocrystal on a large-area substrate. Further, when a coating film was formed on a small area such as a pixel of a display, the adhesion strength with the substrate was likely to be reduced due to shrinkage of the coating film when the polymerizable component was polymerized.

[0009] Patent Document 3 discloses an inkjet ink containing semiconductor nanoparticles using an aqueous medium.

However, since an aqueous medium is used, moisture remains in an application such as a color conversion film having a film thickness of m order, and it is difficult to combine with an electronic device. Patent Document 1: Japanese Patent Laid-Open No. 10-186426

Patent Document 2: Japanese Patent Laid-Open No. 2002-114928

Patent Document 3: Japanese Patent Laid-Open No. 2000-119575

Disclosure of the invention

[0010] An object of the present invention is to provide a color conversion substrate using a color conversion film having sufficient color conversion performance even with a thin film.

Another object of the present invention is to provide a color conversion substrate manufacturing method with high productivity.

Yes

According to the present invention, the following color conversion substrate and the like are provided.

1. A color conversion substrate comprising a substrate, and a color conversion part in which a color conversion film containing a photoluminescent inorganic nanocrystal and a transparent protective layer are laminated in this order on the substrate.

2. The color conversion film further includes a surface treatment agent and / or a transparent resin of a photoluminescent inorganic nanocrystal, and at least one of the surface treatment agent and the transparent resin 2. The color conversion substrate according to 1, wherein the glass transition temperature, softening temperature or melting point is 120 ° C. or higher.

3. The color conversion substrate according to 2, wherein the color conversion film contains 20 to 90% by weight of a photoluminescent inorganic nanocrystal, 50% by weight or less of a surface treatment agent, and 30% by weight or less of a transparent resin.

4. The surface treatment agent is a compound having a group selected from a phosphine group, a phosphine oxide group, an amino group, a thiol group, a phosphate ester group, a phosphonate ester group, a carboxyl group, and an olefin group. Color conversion board.

5. The color conversion substrate according to any one of 1-4, wherein the transparent protective layer is made of a photocurable and / or thermosetting resin composition.

6. The color conversion substrate according to any one of 1 to 4, wherein the transparent protective layer comprises a metal oxide and / or a metal nitride oxide.

7. A composition containing a photoluminescent inorganic nanocrystal and a solvent is applied onto a substrate, the solvent is dried to form a color conversion film, and a transparent protective layer is formed on the color conversion film. The method for producing a color conversion substrate according to any one of 1 to 6, wherein the color conversion part is formed.

8. The method for producing a color conversion substrate according to 7, wherein the boiling point of the solvent is 200 ° C. or less.

9. The method for producing a color conversion substrate according to 7 or 8, wherein the composition is applied onto a substrate by an ink jet method or a nozzle printing method.

10. The color conversion substrate according to any one of 7 to 9, wherein partition walls are arranged on the substrate to form a sectioned area, and the composition is applied in the section to form the color conversion film. The manufacturing method.

[0012] According to the present invention, it is possible to provide a color conversion substrate using a color conversion film having sufficient color conversion performance even with a thin film.

According to the present invention, it is possible to provide a method for manufacturing a color conversion substrate with high productivity. Brief Description of Drawings

FIG. 1 is a diagram showing a light emitting device produced in Example 3.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] The color conversion substrate of the present invention includes a substrate and a photoluminescent inorganic nanocrystalr on the substrate. And a color conversion part in which a transparent protective layer is laminated in this order.

[0015] Examples of the photoluminescent inorganic nanocrystal include the following substances.

(i) Photoluminescent semiconductor nanocrystal

II VI compound semiconductor nanocrystals such as ZnSe, ZnTe, CdSe, IIIV compound semiconductor nanocrystals such as InP, chalcopyrite semiconductor nanotalities such as CuInS and CuInSe

twenty two

Star.

The semiconductor nanocrystal is a semiconductor crystal made into ultrafine particles of nanometer order, and preferably has a particle size of 20 nm or less, more preferably lOnm or less.

(ii) Photoluminescent nano-crystal nore doped with metal chalcogenides doped with transition metal ions

ZnS, ZnSe, CdS, metal force Norekogenaido of CdSe or the like, the I ^{^{匕物, Eu 2+, Eu 3+, Ce}} 3+, T b 3+, doped with transition metal ions of Cu ²⁺ or the like.

(iii) Photoluminescent nanocrystals with metal oxide doped with transition metal ions

YO, Gd O, ZnO, Y Al O, a metal oxide such as ^{^{Zn SiO, Eu 2+, Eu 3+}} , Ce 3

2 3 2 3 3 5 12 2 4

Dopes doped with transition metal ions that absorb visible light, such as ⁺ and Tb ³⁺ .

[0016] In the nanocrystals of (i) and (ii) above, in order to prevent the surface of the nanocrystals from being oxidized and extraction of S, Se, etc., metal oxides such as silica, long chain alkyl groups, phosphoric acid, etc. The surface may be modified with organic substances such as

Furthermore, nanoparticles in which the surface of the nanoparticles is covered with another semiconductor called a shell are more preferable in terms of stability and fluorescence. The surface of the shell may be further coated with a metal oxide such as silica or titania.

[0017] The photoluminescent inorganic nanocrystals described above may be used alone or in combination of two or more.

[0018] The color conversion film of the present invention preferably contains a surface treatment agent and / or a transparent resin of a photoluminescent inorganic nanocrystal in addition to the photoluminescent inorganic nanocrystal, At least one has a glass transition temperature, softening temperature or melting point of 120 ° C or higher. Glass transition temperature, softening temperature or melting point of 120 ° C or higher By including a certain surface treatment agent and / or transparent resin, when the color conversion film is used for a display or the like, it is possible to prevent the color conversion film from flowing due to heating during production or temperature rise during use. The glass transition temperature, softening temperature or melting point of the surface treatment agent and / or the transparent resin is preferably 160 ° C. or higher.

In the present invention, the glass transition temperature and melting point are measured by DSC measurement, and the softening temperature is measured by a ring and ball softening point test method.

[0020] The surface treatment agent for a photoluminescent inorganic nanocrystal can further stabilize the dispersion of the photoluminescent inorganic nanocrystal in the composition.

The surface treatment agent for photoluminescent inorganic nanocrystals can use a known surface treatment agent as the surface treatment agent. Preferably, the photoluminescent inorganic nanocrystals may aggregate during storage of the composition. ! /, Select the surface treatment agent. The surface treatment agent is preferably a compound having a group selected from a phosphine group, a phosphine oxide group, an amino group, a thiol group, a phosphate ester group, a phosphonate ester group, a carboxyl group, and an olefin group.

[0021] Specific examples of the compound containing an amino group include an amino terminal PEG, octylamine, decylamine, and glycine tert butyl ester.

Specific examples of the compound containing a thiol group include octanethiol, octylthiodaricolate, 2-ethylhexyl 3-mercaptopropionate, thiol-terminated PEG, and 3-mer.

Specific examples of the compound containing a phosphoric acid ester group include dibutyl phosphate, di-n-decino lefophosphate, di (polyethylene glycolanol 4-nonino lefenore) phosphate, and tributyl phosphate.

[0022] Specific examples of the compound containing a carboxyl group include decanoic acid, 2-ethylhexanoic acid, 4-monohexylbenzoic acid, and 4-bulubenzoic acid.

Specific examples of the compound containing a phosphine group include tributylphosphine and trioctylphosphine.

An example of a compound containing a specific phosphine oxide group is tributylphosphine oxide. Examples thereof include side and trioctyl phosphine oxide.

Specific examples of the compound containing an olephine group include dodecene, methylundecenoate, burundecenoate, and 1,2-epoxy-9-decene.

[0023] In order for the surface treatment agent to sufficiently adhere to the nanocrystal surface, the molecular weight of these compounds is, for example, preferably 10,000 or less, more preferably 5,000 or less.

[0024] The transparent resin is not particularly limited as long as it can be dispersed in the same solvent as the photoluminescent inorganic nanocrystal, but is preferably soluble in a ketone solvent.

[0025] Specifically, polymethacrylic acid octahydro-4,7-methanoindul ester, a copolymer of methyl methacrylate and N-isopropylmaleimide, polycyclohexylene, and poly carbonate.

[0026] In the color conversion layer of the present invention, the amount of photoluminescent inorganic nanocrystal is preferably 20 to 90 weight ^_0/0, more preferably 20 to 60 weight ^_0/0. The compounding amount of the surface treatment agent for the photoluminescent inorganic nanocrystal is preferably 50% by weight or less, more preferably 2 to 45% by weight. The blending amount of the transparent resin is preferably 30% by weight or less, more preferably 20% by weight or less.

If the photoluminescent inorganic nanocrystal is less than 20% by weight, the color conversion film cannot sufficiently absorb the light from the light source, so that the film thickness may need to be increased. On the other hand, if the photoluminescent inorganic nanocrystal exceeds 90% by weight, the film strength becomes too low and the color conversion film may be damaged before the transparent protective layer is provided.

[0027] In addition to the above substances, the color conversion film may contain additives such as transparent fine particles such as titaure and silica, and an antioxidant.

[0028] The thickness of the color conversion film is not limited, but is usually 1 to 100 m. The color conversion film of the present invention is

Since a transparent protective layer is provided, the film thickness can be reduced to 10 m or less, specifically;

[0029] The transparent protective layer is not particularly limited as long as it is transparent, but it is preferable that the compatibility of the photoluminescent inorganic nanocrystal is low so as not to destroy the lower photoluminescent inorganic nanocrystal layer.

Transparent resin soluble in ester solvents or alcohol solvents when using organic materials Is preferred. In order to increase the strength, a thermosetting and / or photocurable resin is preferable. Examples of the transparent resin include (meth) acrylic resin, polycarbonate resin, silicone resin, polysulfone resin, and epoxy resin.

When an inorganic material is used, metal oxides such as silicon oxide and titanium oxide nitride nitride or metal nitride oxides are preferable.

[0030] The thickness of the transparent protective film is not limited, but is preferably 0.1 to 5111.

[0031] As the substrate, a glass plate, a polymer plate or the like can be used.

[0032] In the color conversion substrate of the present invention, a composition containing a photoluminescent inorganic nanocrystal and a solvent is applied onto a substrate, and the solvent is dried to form a color conversion film. It can be produced by forming a transparent protective layer thereon.

The composition may include a surface treatment agent for the photoluminescent inorganic nanocrystal, a transparent resin having a glass transition temperature, a softening temperature, or a melting point of 120 ° C. or higher.

[0033] Examples of the solvent include xylene, diglyme, and cyclohexanone. Since it is preferable that no solvent remains when the color conversion film is formed, a solvent having a boiling point of 200 ° C. or lower is preferable.

[0034] The composition is applied onto the substrate, but it is preferable to apply the composition onto the substrate by a printing method, because a color conversion film can be formed only on a necessary portion, and the material utilization efficiency is improved. It is preferable to use the inkjet method or nozzle printing method as the printing method.

[0035] When the color conversion film is formed, a partition wall is provided on the substrate, and a composition (ink) is made to flow into an area delimited by the partition wall to form a color conversion film. Easy and preferred.

[0036] The color conversion film of the present invention can increase the concentration of the photoluminescent inorganic nanocrystal, and even a thin film can exhibit sufficient color conversion performance. Further, since the color conversion substrate of the present invention can be produced by the inkjet method, the productivity is increased.

[0037] The transparent protective film can be formed by coating or dipping in the case of an organic material, and can be formed by sputtering, chemical vapor deposition (CVD), or vapor deposition in the case of an inorganic material.

Furthermore, a light emitting device can be manufactured by combining the light emitting element and the color conversion substrate. As the light emitting element, one that emits visible light can be used, for example, an organic EL element, Inorganic EL elements, semiconductor light emitting diodes, and fluorescent display tubes can be used. Of these, organic EL elements and inorganic EL elements are preferred. In particular, organic EL elements are preferred because they provide light emitting elements with low voltage and high brightness.

[Example]

[0039] Synthesis Example 1

[Synthesis of InP / ZnS nanoparticles]

J. Am. Chem. Soc., 2005, 127, 11364. Reference nanoparticles were synthesized. The following is an overview.

(1) Synthesis of ΙηΡ core

200 ml 4-neck flask with indium acetate 0.29 g, myristic acid 0.69 g, octadecene 4

0 ml was weighed out. The flask was set on a mantle heater. A mechanical stirrer equipped with a glass stirring shaft and a Teflon (registered trademark) stirring blade was set on the main tube of the flask. A three-way cock was attached to one of the branch pipes and connected to a nitrogen line and a vacuum line. Another septum was fitted with a rubber septum cap. Thermocouples were set on the remaining branch pipes. The inside of the flask was evacuated to a vacuum and stirred at 120 ° C for 2 hours. The pressure was returned to atmospheric pressure with nitrogen gas, and the temperature was increased to 2 80 ° C.

In a nitrogen-substituted glove box, 1.4 g of a 10% hexane solution of tristrimethylsilylphosphine and lml of octadecene were weighed into a sample bottle and sucked with a gas tight syringe.

A solution of the phosphine compound was injected all at once from the septum cap portion of the four-necked flask. After 5 seconds, 40 ml of octadecene was added, and the reaction temperature was rapidly lowered to 180 ° C. 1 Stirring was continued at 80 ° C for 2 hours.

The temperature was lowered to 50 ° C., and the pressure was reduced by a vacuum pump for 1 hour.

The reaction solution was taken out by returning to atmospheric pressure with nitrogen gas and lowering the temperature to room temperature, and the precipitate was removed by centrifugation (3000 rpm, 10 minutes). The supernatant was once stored in the glove box.

[0040] ( ² ) Synthesis of InP / ZnS core-shell nanoparticles

200ml 4-neck flask with 1 · 48g zinc laurate, 0 · 1 lg sulfur, 0ml octadecene Weighed out. The same apparatus as (1) was attached to the flask.

The inside of the flask was evacuated to a vacuum and stirred at 80 ° C for 30 minutes. The solution was returned to atmospheric pressure with nitrogen gas, and a solution of InP nanoparticles stored in the glove box was added. Stirring was continued under reduced pressure at 80 ° C for 1.5 hours.

The pressure was returned to atmospheric pressure with nitrogen gas, and the temperature was increased to 140 ° C. 1. Stirring was continued for 5 hours. The temperature was lowered to room temperature, the reaction solution was taken out, and coarse particles and unreacted raw materials were removed by centrifugation (3000 rpm, 15 minutes).

The obtained nanoparticles had a fluorescence peak wavelength of 634 nm and a fluorescence quantum yield of 17%. These were measured using a quantum yield measuring device (C9920-02 type) manufactured by Hamamatsu Photonicus. Synthesis example 2

[Synthesis of Cu-doped ZnSe nanoparticles]

Reference nanoparticles were synthesized with reference to J. Am. Chem. Soc., 2005, 127, 17586. The following is an overview.

In a 200 ml four-necked flask, 0.20 g of zinc laurate and 50 ml of octadecene were weighed. The same instrument as in Synthesis Example 1 was set.

The inside of the flask was evacuated to a vacuum and stirred at 120 ° C for 2 hours. The pressure was returned to atmospheric pressure with nitrogen gas, and the temperature was increased to 300 ° C.

In a nitrogen-substituted glove box, 0.02 g of selenium, 0.5 g of hexadecylamine, and 7 g of tributylphosphine were weighed in a sample bottle to dissolve selenium.

The selenium solution was injected all at once from the septum cap portion of the four-necked flask. Stirring was continued for 1.5 hours at 290 ° C.

In a nitrogen-substituted glove box, 0.031 g of copper acetate and 10 ml of tributyl phosphate were weighed into a sample bottle to dissolve the copper acetate. Of this, 0.1 ml was sucked into a syringe and injected into the reaction solution.

After 10 minutes, a solution containing 0.1 lg zinc acetate and 5 ml tributylphosphine was added dropwise to the reaction solution. The dripping took 30 minutes.

After completion of the dropwise addition, the reaction temperature was raised to 230 ° C and stirring was continued for 1.5 hours.

Lower the temperature to room temperature, take out the reaction solution, and precipitate it by centrifugation (3000 rpm, 10 minutes). The temple was removed. The supernatant was once stored in the glove box.

The obtained nanoparticles had a fluorescence peak wavelength of 528 nm and a fluorescence quantum yield of 13%.

[0042] Example 1

The octadecene solution of InP / ZnS nanoparticles obtained in Synthesis Example 1 was poured into ethanol to reprecipitate the nanoparticles. The solvent was removed by decantation, followed by vacuum drying to obtain nanoparticles (photoluminescent inorganic nanocrystals) (75 mg).

A small amount of toluene was added to re-disperse the nanoparticles. Thioglycolic acid 2-ethylhexyl ester (10 mg) was added as a surface treatment agent. After toluene was evaporated, cyclohexanone (175 mg) was added as a solvent. Further, polymethacrylic acid octahydro-4,7-methanoindul ester (Mw = 12,000, Tg = 175 ° C.) (15 mg) was dissolved as a transparent resin.

A black matrix (V259 BK (manufactured by Nippon Steel Chemical Co., Ltd.)) having a width of 20 mm 111 and a thickness of 1 · 5 mm was produced at intervals of 90 am by a photolithography method. Furthermore, a glass substrate having a partition wall (VPA100 / P54-2 (manufactured by Nippon Steel Chemical Co., Ltd.)) having a width of 15 mm and a height of 10 m on a black matrix was prepared.

The composition was applied once to the area of the glass substrate separated by the partition walls, and the solvent was evaporated at 120 ° C. The film thickness at this stage was 2.Ιίη.

Recoating the VPA100 / P54- 2 as a transparent protective layer (produced by Nippon Steel Chemical Co., Ltd.), after evaporation of the solvent at 120 degrees to cure the 365nm UV 300 mj / cm ² irradiated to (approximately thickness after curing 1 β m), a color conversion substrate was prepared.

When a blue light emitting organic EL device was attached to emit light, the blue light of the organic EL device was converted to red with a peak wavelength of 634 nm.

[0043] Example 2

The octadecene solution of Cu-doped ZnSe nanoparticles obtained in Synthesis Example 2 was poured into ethanol to reprecipitate the nanoparticles. The solvent was removed by decantation, followed by vacuum drying to obtain Cu-doped ZnSe nanoparticles (photoluminescent inorganic nanocrystals) (95 mg).

Xylene (250 mg) was added as a solvent to disperse the nanoparticles again. As a surface treatment agent Thiol-terminated polycarbonate (Mw = 2, 500, softening temperature = 165 ° C.) (75 mg) was added. The composition thus obtained was applied on the same glass substrate as in Example 1, and the solvent was evaporated at 120 ° C.

Using a sputtering system as a transparent protective layer, form a SiO N film with a thickness of about 0.3 111

1. 5 0. 3

And a color conversion substrate was produced.

When the blue light-emitting organic EL device was laminated and the organic EL device was allowed to emit light, the blue light of the organic EL device was converted to green with a peak wavelength of 528 nm.

Example 3

The light emitting device 1 shown in FIG. 1 was produced as follows.

Similar to Example 1, a black matrix 12 was formed on a glass substrate 11. Next, red, green, and blue color filters 13, 14, and 15 were formed in this order in thicknesses of about 1 · 5 111 in the area delimited by black bear tritas 12, respectively. Further, partition walls 16 were formed on the black matrix 12 in the same manner as in Example 1.

The composition prepared in Example 1 was applied once onto the red color filter 13 in the area separated by the partition walls. The solvent was dried at 120 ° C to form a red color conversion film 17 having a film thickness of about 2.1 m.

In the next step, the composition used in Example 2 was applied once onto the green color filter 14 in the area separated by the partition walls. The solvent was dried at 120 ° C. to form a green color conversion film 18 having a film thickness of about 2.ππι.

Finally, methyl methacrylate 'methacrylate copolymer (Mw = 13, 000) (27 wt%), penta Ulis Rito Honoré tri Tarireto (19 wt ^_0/0), Inorega, Cure 907 (0.4 wt ⁰ / ₀ ), 2-acetyloxy-1-methoxypropane (53.6 wt%) was applied to the entire surface of the substrate by spin coating. After drying the solvent at 120 ° C, the film is cured by irradiating 300mj / cm ² with 365nm wavelength UV, and the film thickness is about 1.5m (the film thickness on the red and green color conversion film. On the blue color filter The transparent protective layer 19 was about 3.5 m).

A color conversion unit 30 is formed from the black matrix 12, the red, green, and blue color filters 13, 14, and 15, the partition wall 16, the red color conversion film 17, the green color conversion film 18, and the transparent protective layer 19. The color conversion substrate 10 was completed by forming the substrate 11 and the color conversion unit 30. On the substrate 21, an electrode (not shown) processed in a matrix in accordance with the pitch of the partition walls 16 of the color conversion substrate 10 and a blue light emitting organic EL element 23 were formed, and an organic EL panel 20 was manufactured.

The light emitting device 1 was manufactured by stacking the fluorescence conversion substrate and the organic EL panel. When an image was displayed on this light-emitting device 1, a full-color image could be displayed.

Industrial applicability

The color display device using the color conversion substrate of the present invention is a consumer or industrial display, for example, a display for a portable display terminal, an in-vehicle display such as a car navigation system or an instrument panel, a personal computer for office automation (OA), Used for display devices for TV (TV receiver) or FA (factory automation). In particular, it is used for thin, flat monocolor, multicolor or full color displays. The entire contents of the documents described in this specification are incorporated herein by reference.

Claims

The scope of the claims

[1] a substrate;

On the substrate, a color conversion part in which a color conversion film containing a photoluminescent inorganic nanocrystal and a transparent protective layer are laminated in this order;

Including color conversion board.

[2] The color conversion film further includes a surface treatment agent for photoluminescent inorganic nanocrystals and / or a transparent resin,

2. The color conversion substrate according to claim 1, wherein at least one of the surface treatment agent and the transparent resin has a glass transition temperature, a softening temperature, or a melting point of 120 ° C. or higher.

[3] The color conversion film is

20-90% by weight of photoluminescent inorganic nanocrystal,

50% by weight or less of the surface treatment agent, and

The color conversion substrate according to claim 2, comprising 30% by weight or less of a transparent resin.

[4] The surface treatment agent is a compound having a group selected from a phosphine group, a phosphine oxide group, an amino group, a thiol group, a phosphate ester group, a phosphonate ester group, a carboxyl group, and an olefin group. Or the color conversion board | substrate of 3.

[5] The transparent protective layer comprises a photocurable and / or thermosetting resin composition.

The color conversion board | substrate in any one of 1-4.

[6] The transparent protective layer according to claim 4, comprising a metal oxide and / or a metal nitride oxide;

V, the color conversion board described in the gap.

[7] A composition containing a photoluminescent inorganic nanocrystal and a solvent is coated on a substrate,

Drying the solvent to form a color conversion film;

A transparent protective layer is formed on the color conversion film to form a color conversion portion;! ~ 6

V, A method for producing a color conversion substrate as described in any of the above.

8. The method for producing a color conversion substrate according to claim 7, wherein the solvent has a boiling point of 200 ° C or lower.

[9] The method for producing a color conversion substrate according to [7] or [8], wherein the composition is applied onto a substrate by an ink jet method or a nozzle printing method. [10] A partition wall is formed on the substrate to form a sectioned area,

10. The method for producing a color conversion substrate according to claim 7, wherein the color conversion film is formed by applying the composition in the area.