WO2022145252A1 - Procédé d'impression d'encre contenant des particules de nanocristal luminescent, procédé de formation d'une section de pixel de filtre de couleur, et filtre de couleur - Google Patents

Procédé d'impression d'encre contenant des particules de nanocristal luminescent, procédé de formation d'une section de pixel de filtre de couleur, et filtre de couleur Download PDF

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Publication number
WO2022145252A1
WO2022145252A1 PCT/JP2021/046521 JP2021046521W WO2022145252A1 WO 2022145252 A1 WO2022145252 A1 WO 2022145252A1 JP 2021046521 W JP2021046521 W JP 2021046521W WO 2022145252 A1 WO2022145252 A1 WO 2022145252A1
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WIPO (PCT)
Prior art keywords
ink
luminescent nanocrystal
nanocrystal particles
container
light
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PCT/JP2021/046521
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English (en)
Japanese (ja)
Inventor
靖彦 郡司
史祥 吉澤
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Dic株式会社
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Publication of WO2022145252A1 publication Critical patent/WO2022145252A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters

Definitions

  • the present invention relates to a printing method of an ink containing luminescent nanocrystal particles, a method of forming a color filter pixel portion, and a color filter.
  • a pixel portion (color filter pixel portion) in a display such as a liquid crystal display device or an organic EL display device includes, for example, a red organic pigment particle or a green organic pigment particle and an alkali-soluble resin and / or an acrylic monomer. It has been manufactured by a photolithography method using the curable resist material contained therein.
  • the color filter manufacturing method by the above photolithography method has a drawback that the resist material other than the pixel portion including the relatively expensive luminescent nanocrystal particles is wasted due to the characteristics of the manufacturing method. Under such circumstances, in order to eliminate the waste of the resist material as described above, it has begun to be studied to form the pixel portion of the optical conversion substrate by the inkjet method (see Patent Document 1).
  • the inkjet printing apparatus used in the inkjet method includes at least an ink container (ink tank) for accommodating ink and an ejection head for ejecting ink.
  • the ink container is connected to an external atmosphere, and outside air (atmosphere) is supplied to the ink container as the amount of ink increases or decreases (see, for example, Patent Documents 2 and 3).
  • luminescent nanocrystal particles have unstable properties with respect to the atmosphere (particularly oxygen and moisture)
  • conventional inkjet printing is used for printing inks containing luminescent nanocrystal particles (inks containing luminescent nanocrystal particles).
  • problems such as deactivation of luminescent nanocrystal particles in the device, deterioration of the optical characteristics of the pixel portion, and generation of agglomerates in the ink may occur.
  • One aspect of the present invention is a method for printing luminescent nanocrystal particle-containing ink using an inkjet printing device including an ink containing container and an ejection head, wherein the luminescent nanocrystals are housed in the ink containing container.
  • An ink supply step of supplying a part of the particle-containing ink to the ejection head and an ejection step of ejecting the luminescent nanocrystal particle-containing ink from the ejection head are provided.
  • the volume of the ink accommodating space to be accommodated is configured to be changeable, and the ink accommodating space is reduced and maintained in a reduced state with the supply of the luminescent nanocrystal particle-containing ink in the ink supply process.
  • the present invention relates to a printing method for preventing the inflow of outside air into the ink container.
  • the conventional inkjet printing device consumes the ink in order to reduce the pressure difference between the pressure (gas pressure) in the ink container and the outside pressure.
  • the ink container has an ink container in which the same amount of outside air as the volume of the ink is discharged into the ink container.
  • the ink storage space is reduced with the supply (consumption) of the ink, so that the ink storage space does not become empty even if the ink (ink containing luminescent nanocrystal particles) is consumed.
  • the ink storage space is maintained in a reduced state, the inflow of outside air (atmosphere) into the ink storage container is prevented. Therefore, according to the printing method on the above side surface, it is possible to suppress the deactivation of the luminescent nanocrystal particles in the apparatus.
  • the ink container has impermeableness to moisture and / or oxygen. In this case, the deactivation of the luminescent nanocrystal particles can be further prevented.
  • the luminescent nanocrystal particle-containing ink may be photocurable.
  • the ink container has impermeableness to light so that the ink does not cure in the apparatus.
  • the luminescent nanocrystal particle-containing ink may be an ink for forming a color filter pixel portion.
  • Another aspect of the present invention relates to a method of forming a color filter pixel portion, which forms a color filter pixel portion by using the printing method of the above side surface.
  • Another aspect of the present invention relates to a color filter including a color filter pixel portion formed by the method for forming the color filter pixel portion on the above side surface.
  • the present invention it is possible to provide a method for printing an ink containing luminescent nanocrystal particles by an inkjet method while suppressing deactivation of the luminescent nanocrystal particles in the apparatus.
  • FIG. 1 is a schematic diagram showing an inkjet printing apparatus used in the printing method of one embodiment.
  • FIG. 2 is a schematic cross-sectional view showing an example of an ink container used in the printing method of one embodiment.
  • FIG. 3 is a schematic cross-sectional view of the color filter of one embodiment.
  • the printing method of one embodiment is a printing method of luminescent nanocrystal particle-containing ink using an inkjet printing device.
  • the inkjet printing apparatus used in the printing method of the present embodiment will be described first.
  • FIG. 1 is a schematic diagram showing an inkjet printing apparatus used in the printing method of one embodiment.
  • the inkjet printing device 1 shown in FIG. 1 is an inkjet printing device for luminescent nanocrystal particle-containing ink (hereinafter, also simply referred to as “ink”), and is used for forming a color filter pixel portion.
  • ink for luminescent nanocrystal particle-containing ink
  • the inkjet printing apparatus 1 includes at least an ink container 2, an ejection head 3, and an ink flow path 4.
  • the ink container 2 is configured to be capable of accommodating ink (ink containing luminescent nanocrystal particles). Specifically, a space (ink storage space) is formed inside the ink storage container 2, and ink is stored in the space.
  • the ink container 2 is connected to the ejection head 3 via the ink flow path 4.
  • the ink container 2 is composed of a first ink container 2a, a second ink container 2b, and a third ink container 2c.
  • the inkjet printing apparatus 1 includes first to third ink container 2a, 2b, 2c as the ink container 2.
  • the first ink container 2a is a tank for first supplying ink to the printing apparatus, and is also called a main tank.
  • the first ink container 2a is configured to be removable from, for example, the main body of the apparatus. Therefore, in the inkjet printing apparatus 1 of the present embodiment, ink can be replenished by replacing the first ink container 2a.
  • the first ink storage container 2a is connected to the second ink storage container 2b via the first ink flow path 4a in the ink flow path 4.
  • the ink contained in the first ink container 2a is supplied to the second ink container 2b through the first ink flow path 4a.
  • the second ink container 2b is a reserve tank.
  • the ink is supplied from the first ink container 2a through the first ink flow path 4a as the ink is consumed, so that the amount of ink stored becomes a constant amount. It is configured as follows. Therefore, according to the inkjet printing apparatus 1 of the present embodiment, when the ink in the first ink container 2a becomes empty, the ink can be replenished and the printing can be performed in parallel.
  • the second ink container 2b is connected to the third ink container 2c via the second ink flow path 4b in the ink flow path 4.
  • the ink supplied to the second ink container 2b is supplied to the third ink container 2c through the second ink flow path 4b.
  • the third ink container 2c is an ink container having the smallest capacity among the first to third ink containers 2a, 2b, and 2c, and is also called a sub tank.
  • the third ink container 2c is connected to the ejection head 3 via the third ink flow path 4c.
  • the ink supplied to the third ink container 2c is supplied to the ejection head 3 through the third ink flow path 4c.
  • At least the first ink storage container 2a of the ink storage containers 2 is configured so that the volume of the ink storage space can be changed.
  • All the ink containing containers 2a, 2b, and 2c of the first to third ink containing containers may be configured so that the volume of the ink containing space can be changed.
  • the second ink storage container 2b and / or the third ink storage container 2c are configured so that the volume of the ink storage space can be changed, and the first ink storage container 2a contains ink. It does not have to be configured so that the volume of the space can be changed.
  • An example of an ink storage container configured so that the volume of the ink accommodating space can be changed is composed of an ink accommodating portion configured to be deformable according to the amount of ink inside and a housing for accommodating the ink accommodating portion. It is an ink storage container.
  • the ink container 2 is such a container, the volume of the ink storage space can be changed by deforming the ink storage portion.
  • the ink container 2 does not have to be provided with a housing. That is, the ink container 2 may be composed only of an ink accommodating portion that is configured to be deformable according to the amount of ink inside.
  • the ink accommodating portion may be a bag body made of a flexible resin (for example, a resin film).
  • the flexible resin may be, for example, low density polyethylene, high density polyethylene, Teflon (registered trademark), saran, vinyl chloride, polyvinyl alcohol, polypropylene, nylon, polyethylene terephthalate and the like.
  • the bag body may be a bag-shaped laminated body in which a plurality of resin films composed of these resins are laminated.
  • the ink accommodating portion may be a bag body formed by processing a laminate in which a resin film made of the above-mentioned flexible resin and a metal film are laminated into a bag shape.
  • the laminated body constituting such a bag include those in which layers made of polyamide, aluminum alloy, polyethylene terephthalate and polypropylene are laminated in this order, those in which alumina is vapor-deposited on a film made of polyethylene terephthalate, and aluminum foil. Examples thereof include those laminated with a polyethylene film.
  • the housing is made of a rigid material such as plastic or metal.
  • FIG. 2 is a schematic cross-sectional view showing an example of a syringe-type ink container provided with such a movable wall.
  • the ink container 21 shown in FIG. 2 includes an ink storage unit 22 and a movable wall 23 provided in the ink storage unit 22.
  • the ink accommodating portion 22 is formed in a tubular shape, for example, and has an ink ejection port 24 for supplying the ink contained therein to the outside and a movable wall 23 toward the ink ejection port 24 side as the ink is consumed. It has an atmospheric communication port 25 for enabling movement (sliding).
  • the ink accommodating portion 22 is a molded product made of a material having low water vapor permeability, such as polyethylene and polypropylene.
  • the movable wall 23 is made of an elastic body made of a flexible member such as silicone rubber, comes into contact with the inner wall 26 of the ink accommodating portion 22, and has an ink accommodating space 27 together with a part of the inner wall 26 of the ink accommodating portion 22. Is defined.
  • the ink storage space 27 is shielded from the outside air by the movable wall 23.
  • the movable wall 23 may be covered with a resin having a gas barrier property such as Teflon resin or Saran resin.
  • a resin having a gas barrier property such as Teflon resin or Saran resin.
  • swelling and contraction of the movable wall due to ink and the environment are less likely to occur, and the sliding resistance between the movable wall and the inner wall of the ink accommodating portion is likely to be stable.
  • evaporation of ink due to long-term storage is less likely to occur.
  • Nitrogen gas for example, helium gas, neon gas, etc.
  • noble gas for example, helium gas, neon gas, etc.
  • It may be filled with an inert gas such as argon gas) or carbon dioxide gas.
  • the ink container 2 (first to third ink containers 2a, 2b, 2c) is made of water from the viewpoint of preventing deactivation of luminescent nanocrystal particles due to water entering the ink container 2.
  • the water transmittance of the ink container 2 may be 2 g / m 2 , day or less.
  • the water permeability can be measured by, for example, the method described in JIS K 7129.
  • the ink container 2 is preferably made of a resin having a moisture transmittance in the above range (for example, a flexible resin).
  • the ink container 2 (first to third ink containers 2a, 2b, 2c) is made of oxygen from the viewpoint of preventing deactivation of luminescent nanocrystal particles due to oxygen entering the ink container 2.
  • the oxygen permeability of the ink container 2 may be 5 ml / m 2 , day, MPa or less.
  • the oxygen permeability can be measured, for example, by the method described in JIS K7126-2.
  • the ink container 2 is preferably made of a resin having an oxygen permeability in the above range (for example, a flexible resin).
  • the ink container 2 (first to third ink container 2a, 2b, 2c) is a viewpoint of preventing the ink from being cured by light entering the ink container 2 when the ink is photocurable. Therefore, it is preferable to have impermeableness to light.
  • the light transmittance of the ink container 2 at a wavelength of 450 nm may be 4% or less.
  • the light transmittance at the wavelength of the ink container 2 at a wavelength of 365 nm and a wavelength of 395 nm may be 1% or less.
  • the light transmittance is determined, for example, by measuring the body fragment of the container with a spectrophotometer.
  • the ejection head 3 is provided with, for example, a plurality of nozzles having one end open, and is configured to eject the ink supplied from the ink container 2.
  • the ink is supplied to the ejection head 3, the ink is ejected from the nozzle opening (ejection port).
  • the discharge head 3 various configurations can be adopted depending on the discharge method. Examples of the discharge method include a bubble jet (registered trademark) method using an electric heat converter as an energy generating element, a piezo jet method using a piezoelectric element, and the like.
  • the inkjet printing apparatus 1 includes a first ink container 2a and a second ink container 2b, a second ink container 2b and a third ink container 2c, and a second ink container.
  • a pump for supplying ink may be provided between the ink container 2c of 3 and the ejection head 3.
  • the pump may not be installed and the ink can be supplied by its own weight.
  • the ink flow path 4 may be provided with a check valve for preventing backflow of ink. For example, by providing the check valve in the second ink flow path 4b, it is possible to prevent the backflow of ink from the third ink container 2c to the second ink container 2b.
  • the basic configuration other than the above in the inkjet printing apparatus 1 shall be the same as that of the conventional inkjet printing apparatus (for example, the inkjet printing apparatus disclosed in JP-A-2019-81323 and International Publication No. 2010/038696). Can be done.
  • the inkjet printing apparatus 1 accommodates a plurality of types of ink corresponding to the emission color (red, green, blue) of the pixel portion, and is in the ink so that each ink can be ejected at the same time.
  • a plurality of ink containing containers 2 and a plurality of ejection heads 3 may be provided for each emission color of the luminescent nanocrystal particles.
  • the inkjet printing apparatus 1 includes an ink storage container 2 for red ink (ink containing red luminescent nanocrystal particles), an ink storage container 2 for green ink (ink containing green luminescent nanocrystal particles), and the like.
  • the ink storage container 2 for white ink may be provided, and the ejection head 3 for red ink, the ejection head 3 for green ink, and the ejection head 3 for white ink may be provided, respectively.
  • the first to third ink storage containers 2a, 2b, and 2c may be provided in the inkjet printing apparatus.
  • the number of each discharge head 3 may be one or a plurality.
  • the ink container 2 for white ink contains ink that does not contain luminescent nanocrystal particles, the first ink container 2a for white ink can change the volume of the ink storage space. It does not have to be configured.
  • the number of ink storage containers in the inkjet printing device 1 is not particularly limited, and the inkjet printing device 1 does not include any of the first to third ink storage containers 2a, 2b, and 2c. You may.
  • the ink container 2 provided in the inkjet printing device 1 may be only the first ink container 2a, or may be the first ink container 2a and the third ink container 2c.
  • the inkjet printing apparatus 1 may include ink storage containers other than the first to third ink storage containers 2a, 2b, and 2c.
  • the printing method of one embodiment includes an ink supply step of supplying a part of ink (ink containing luminescent nanocrystal particles) contained in the ink container 2 to the ejection head 3, and ejection of ink from the ejection head 3. It is equipped with a process.
  • continuous printing can be performed by repeatedly performing the ink supply process and the ejection process.
  • each step will be described.
  • the ink supply step a part of the ink contained in the ink container 2 (first to third ink container 2a, 2b, 2c) is supplied to the ejection head 3.
  • the ink supply step from the first ink storage container 2a to the second ink storage container 2b at the same time as the ink is supplied from the third ink storage container 2c to the ejection head 3 or before and after the ink is supplied.
  • the ink is supplied and the ink is supplied from the second ink containing container 2b to the third ink containing container 2c.
  • the ink storage space of the first ink storage container 2a is reduced as the ink is supplied from the first ink storage container 2a to the second ink storage container 2b in the ink supply process.
  • the first ink container 2a is a bag body that is configured to be deformable according to the amount of ink inside
  • the ink container is deformed (shrinked) when the ink is supplied. This reduces the volume of the ink storage space.
  • the first ink storage container 2a is a syringe type ink storage container provided with a movable wall
  • the volume of the ink storage space is reduced by moving the movable wall toward the ejection port side.
  • the reduced volume amount (reduced volume amount) is substantially the same as the volume amount of the ink supplied from the first ink storage container 2a to the second ink storage container 2b.
  • the ink storage space of the first ink storage container 2a is maintained in a reduced state until the ink is supplied from the first ink storage container 2a to the second ink storage container 2b in the next ink supply step. Then, when the ink is supplied from the first ink storage container 2a to the second ink storage container 2b in the next ink supply step, the ink is further reduced. In this way, the inflow of outside air into the ink container due to the pressure difference with the outside air pressure is prevented.
  • the ink supplied by the ink supply process is ejected from the ejection head 3.
  • the ejection step may be performed at the same time as the ink supply step.
  • the ink accommodating space is reduced with the supply of the ink in the ink supply step, and the ink storage space is maintained in the reduced state. , Prevent the inflow of outside air (atmosphere) into the ink container. Therefore, according to the printing method of the luminescent nanocrystal particle-containing ink of the above-described embodiment, it is possible to suppress the inflow of air into the ink container and the deactivation of the luminescent nanocrystal particles.
  • the printing method of the luminescent nanocrystal particle-containing ink of one embodiment has been described above, the printing method of the luminescent nanocrystal particle-containing ink of the present invention is not limited to the above.
  • the printing method of the light-emitting nanocrystal particle-containing ink may further include an ink storage step of storing the ink (light-emitting nanocrystal particle-containing ink) in the ink storage container 2.
  • ink is stored in at least the first ink storage container 2a of the ink storage containers 2 (first to third ink storage containers 2a, 2b, 2c).
  • the ink storage step may be a step of attaching the ink storage container 2 (for example, the first ink storage container 2a) containing ink to the main body of the apparatus.
  • the ink storage container 2 may be filled with the inert gas before and / or after the ink is stored. Further, the dissolved oxygen in the ink may be removed by bubbling the ink contained in the ink container 2 with an inert gas.
  • the ink containing step may be carried out before the ink supply step and the ejection step, and may be carried out to replenish the ink in the ink containing container 2 after the ink supplying step and the ejection step.
  • the first ink container 2a is a bag body that is configured to be deformable according to the amount of ink inside, the ink storage of the first ink container 2a reduced by the ink supply process due to the replenishment of ink. The space can be expanded.
  • the ink storage space of the second ink storage container 2b may be reduced as the ink is supplied from the second ink storage container 2b to the third ink storage container 2c, and the ink storage space of the second ink storage container 2b may be reduced.
  • the ink storage space of the third ink storage container 2c may be reduced as the ink is supplied from the container 2c to the ejection head 3.
  • the luminescent nanocrystal particle-containing ink is an inkjet ink prepared to be compatible with the inkjet printing method.
  • the luminescent nanocrystal particle-containing ink contains at least luminescent nanocrystal particles, and further contains, for example, components such as a photopolymerizable compound, an organic ligand, a photopolymerization initiator, a light scattering particle, and a polymer dispersant.
  • a luminescent nanocrystal particle-containing ink having such a composition is suitably used for forming a color filter pixel portion.
  • the luminescent nanocrystal particles of one embodiment containing luminescent nanocrystal particles, a photopolymerizable compound, an organic ligand, a photopolymerization initiator, a light scattering particle, and a polymer dispersant.
  • the contained ink will be described.
  • the luminescent nanocrystal particles are nano-sized crystals that absorb excitation light and emit fluorescence or phosphorescence, and for example, the maximum particle size measured by a transmission electron microscope or a scanning electron microscope is 100 nm or less. It is a crystal.
  • the luminescent nanocrystal particles can emit light (fluorescence or phosphorescence) having a wavelength different from the absorbed wavelength, for example, by absorbing light having a predetermined wavelength.
  • the luminescent nanocrystal particles may be red luminescent nanocrystal particles (red luminescent nanocrystal particles) that emit light (red light) having an emission peak wavelength in the range of 605 to 665 nm, and may be 500 to 560 nm. It may be green luminescent nanocrystal particles (green luminescent nanocrystal particles) that emit light having an emission peak wavelength in the range (green light), and may be light having an emission peak wavelength in the range of 420 to 480 nm (blue light).
  • the ink preferably contains at least one of these luminescent nanocrystal particles.
  • the light absorbed by the luminescent nanocrystal particles is, for example, light having a wavelength in the range of 400 nm or more and less than 500 nm (particularly, light having a wavelength in the range of 420 to 480 nm) (blue light) or light in the range of 200 nm to 400 nm. It may be light of the wavelength of (ultraviolet light).
  • the emission peak wavelength of the luminescent nanocrystal particles can be confirmed, for example, in the fluorescence spectrum or the phosphorescence spectrum measured by using a spectrofluorometer.
  • the red-emitting nanocrystal particles are 665 nm or less, 663 nm or less, 660 nm or less, 658 nm or less, 655 nm or less, 653 nm or less, 651 nm or less, 650 nm or less, 647 nm or less, 645 nm or less, 643 nm or less, 640 nm or less, 637 nm or less, 635 nm or less.
  • an emission peak wavelength of 632 nm or less or 630 nm or less it is preferable to have an emission peak wavelength of 628 nm or more, 625 nm or more, 623 nm or more, 620 nm or more, 615 nm or more, 610 nm or more, 607 nm or more or 605 nm or more.
  • These upper limit values and lower limit values can be arbitrarily combined. In the same description below, the upper limit value and the lower limit value described individually can be arbitrarily combined.
  • Green luminescent nanocrystal particles have emission peak wavelengths of 560 nm or less, 557 nm or less, 555 nm or less, 550 nm or less, 547 nm or less, 545 nm or less, 543 nm or less, 540 nm or less, 537 nm or less, 535 nm or less, 532 nm or less, or 530 nm or less.
  • an emission peak wavelength of 528 nm or more, 525 nm or more, 523 nm or more, 520 nm or more, 515 nm or more, 510 nm or more, 507 nm or more, 505 nm or more, 503 nm or more, or 500 nm or more.
  • Blue luminescent nanocrystal particles have emission peak wavelengths of 480 nm or less, 477 nm or less, 475 nm or less, 470 nm or less, 467 nm or less, 465 nm or less, 463 nm or less, 460 nm or less, 457 nm or less, 455 nm or less, 452 nm or less, or 450 nm or less.
  • an emission peak wavelength at 450 nm or more, 445 nm or more, 440 nm or more, 435 nm or more, 430 nm or more, 428 nm or more, 425 nm or more, 422 nm or more, or 420 nm or more.
  • the wavelength of light emitted by luminescent nanocrystal particles depends on the size (for example, particle size) of the luminescent nanocrystal particles according to the solution of the Schrodinger wave equation of the well-type potential model, but the luminescent nanocrystal particles It also depends on the energy gap of the crystal particles. Therefore, the emission color can be selected by changing the constituent material and size of the luminescent nanocrystal particles to be used.
  • the luminescent nanocrystal particles may be luminescent nanocrystal particles (luminescent semiconductor nanocrystal particles) containing a semiconductor material.
  • Examples of the luminescent semiconductor nanocrystal particles include quantum dots and quantum rods. Among these, quantum dots are preferable from the viewpoint of easy control of the emission spectrum.
  • the luminescent semiconductor nanocrystal particles may consist only of a core containing the first semiconductor material, and include a core containing the first semiconductor material and a second semiconductor material different from the first semiconductor material, as described above. It may have a shell that covers at least a portion of the core.
  • the structure of the luminescent semiconductor nanocrystal particles may be a structure consisting of only a core (core structure) or a structure consisting of a core and a shell (core / shell structure).
  • the luminescent semiconductor nanocrystal particles include a third semiconductor material different from the first and second semiconductor materials in addition to the shell (first shell) containing the second semiconductor material, and the above-mentioned core.
  • the structure of the luminescent semiconductor nanocrystal particles may be a structure including a core, a first shell, and a second shell (core / shell / shell structure).
  • Each of the core and the shell may be a mixed crystal containing two or more kinds of semiconductor materials (for example, CdSe + CdS, CIS + ZnS, etc.).
  • the luminescent nanocrystal particles are selected as the semiconductor material from the group consisting of II-VI group semiconductors, III-V group semiconductors, I-III-VI group semiconductors, IV group semiconductors and I-II-IV-VI group semiconductors. It is preferable to contain at least one semiconductor material.
  • Specific semiconductor materials include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeDZn.
  • red-emitting semiconductor nanocrystal particles examples include CdSe nanocrystal particles and nanocrystal particles having a core / shell structure, wherein the shell portion is CdS and the inner core portion is CdSe.
  • the shell part is a mixed crystal of ZnS and ZnSe and the inner core part is InP nanocrystal particles, the mixed crystal nanocrystal particles of CdSe and CdS, the mixed crystal nanocrystal particles of ZnSe and CdS, and the core.
  • Nanocrystal particles with a / shell / shell structure the first shell portion is ZnSe, the second shell portion is ZnS, and the inner core portion is InP.
  • Nanocrystal particles with a shell structure the first shell portion is a mixed crystal of ZnS and ZnSe, the second shell portion is ZnS, and the inner core portion is InP. And so on.
  • green-emitting semiconductor nanocrystal particles examples include CdSe nanocrystal particles, mixed-crystal nanocrystal particles of CdSe and ZnS, and nanocrystal particles having a core / shell structure, wherein the shell portion is ZnS.
  • Nanocrystal particles whose inner core is InP nanocrystal particles having a core / shell structure, whose shell is a mixed crystal of ZnS and ZnSe, and whose inner core is InP.
  • Nanocrystal particles with a core / shell / shell structure the first shell portion is a mixed crystal of ZnS and ZnSe, the second shell portion is ZnS, and the inner core portion is InP. Examples include certain nanocrystal particles.
  • the blue light emitting semiconductor nanocrystal particles include, for example, ZnSe nanocrystal particles, ZnS nanocrystal particles, and nanocrystal particles having a core / shell structure, and the shell portion is ZnSe and the inner core portion.
  • the nano-crystal particles have a core / shell / shell structure.
  • the first shell portion is ZnSe
  • the second shell portion is ZnS
  • the inner core portion is InP
  • the nanocrystal particles have a core / shell / shell structure. Examples thereof include nano-crystal particles in which the first shell portion is a mixed crystal of ZnS and ZnSe, the second shell portion is ZnS, and the inner core portion is InP.
  • Semiconductor nanocrystal particles have the same chemical composition, and by changing the average particle size of the particles themselves, the color to be emitted from the particles can be changed to red or green. Further, it is preferable to use semiconductor nanocrystal particles as such, which have as little adverse effect on the human body as possible.
  • semiconductor nanocrystal particles containing cadmium, selenium, etc. are used as luminescent nanocrystal particles
  • semiconductor nanocrystal particles containing the above elements (cadmium, selenium, etc.) as little as possible are selected and used alone, or the above elements. It is preferable to use it in combination with other luminescent nanocrystal particles so that the amount of cadmium is as small as possible.
  • the shape of the luminescent nanocrystal particles is not particularly limited, and may be any geometric shape or any irregular shape.
  • the shape of the luminescent nanocrystal particles may be, for example, spherical, ellipsoidal, pyramidal, disc-shaped, branched, net-shaped, rod-shaped, or the like.
  • particles having less directional particle shape for example, particles having a spherical shape, a regular tetrahedron shape, etc.
  • the uniformity and fluidity of the ink can be further improved. ..
  • the average particle diameter (volume average diameter) of the luminescent nanocrystal particles may be 1 nm or more, and may be 1.5 nm, from the viewpoint of easily obtaining light emission of a desired wavelength and from the viewpoint of excellent dispersibility and storage stability. It may be more than 2 nm and may be 2 nm or more. From the viewpoint that a desired emission wavelength can be easily obtained, it may be 40 nm or less, 30 nm or less, or 20 nm or less.
  • the average particle diameter (volume average diameter) of the luminescent nanocrystal particles is obtained by measuring with a transmission electron microscope or a scanning electron microscope and calculating the volume average diameter.
  • the luminescent nanocrystal particles preferably have an organic ligand on the surface thereof.
  • the surface of the luminescent nanocrystal particles may be passivated by an organic ligand.
  • the organic ligand may be coordinate-bonded to the surface of the luminescent nanocrystal particles. Details of the organic ligand will be described later.
  • the luminescent nanocrystal particles may have a polymer dispersant on the surface thereof.
  • the polymer dispersant may be bound to the surface of the luminescent nanocrystal particles by exchanging the organic ligand that binds to the surface of the luminescent nanocrystal particles with the polymer dispersant.
  • the polymer dispersant is blended with the luminescent nanocrystal particles in which the organic ligand is coordinated. Details of the polymer dispersant will be described later.
  • the luminescent nanocrystal particles those dispersed in a colloidal form in a solvent, a photopolymerizable compound, or the like can be used.
  • the surface of the luminescent nanocrystal particles in a dispersed state is preferably passivated by an organic ligand.
  • the solvent include cyclohexane, hexane, heptane, chloroform, toluene, octane, chlorobenzene, tetralin, diphenyl ether, propylene glycol monomethyl ether acetate, butyl carbitol acetate, or a mixture thereof.
  • luminescent nanocrystal particles examples include indium phosphide / zinc sulfide, D-dot, CuInS / ZnS from NN-Labs, and InP / ZnS from Aldrich.
  • the content of the luminescent nanocrystal particles is, for example, 20 to 80% by mass, 22 to 70% by mass, and 24 to 60% by mass based on the total mass of the ink from the viewpoint of further improving the external quantum efficiency of the pixel portion. , 24-50% by mass or 26-40% by mass.
  • the content of the luminescent nanocrystal particles does not include the amount of the organic ligand bound to the luminescent nanocrystal particles.
  • the "total mass of the ink" can be rephrased as a component to be contained in the cured product of the ink. That is, when the ink contains a solvent, it means a component other than the solvent contained in the ink, and the amount of the solvent is not included in the total mass of the ink unless otherwise specified.
  • the ink may contain two or more of the red luminescent nanocrystal particles, the green luminescent nanocrystal particles, and the blue luminescent nanocrystal particles as the luminescent nanocrystal particles, but these particles are preferable. Includes only one of them.
  • the content of the green luminescent nanocrystal particles and the content of the blue luminescent nanocrystal particles are preferably 10% by mass based on the total mass of the luminescent nanocrystal particles. The following is more preferable, and it is 0% by mass.
  • the content of the red luminescent nanocrystal particles and the content of the blue luminescent nanocrystal particles are preferably 10% by mass based on the total mass of the luminescent nanocrystal particles. The following is more preferable, and it is 0% by mass.
  • the organic ligand exists near the surface of the luminescent nanocrystal particles and has a function of dispersing the luminescent nanocrystal particles.
  • the organic ligand is, for example, a functional group for ensuring affinity with a photopolymerizable compound, a solvent, etc. (hereinafter, also simply referred to as “affinity group”) and a functional group capable of binding to luminescent nanoparticles. It has (a functional group for ensuring the adsorptivity to luminescent nanoparticles) and exists in the vicinity of the surface of the luminescent nanoparticles by coordinating and bonding to the surface of the luminescent nanoparticles. do.
  • organic ligand examples include TOP (trioctylphosphine), TOPO (trioctylphosphinoxide), oleic acid, phosphonic acid, linolenic acid, lysynolic acid, gluconic acid, 16-hydroxyhexadecanoic acid, 12-hydroxystearic acid, N.
  • the content of the organic ligand may be, for example, 10 to 50 parts by mass or 10 to 15 parts by mass with respect to 100 parts by mass of the luminescent nanocrystal particles.
  • the photopolymerizable compound is a compound that polymerizes by irradiation with light, and is, for example, a radically polymerizable compound (photoradical polymerizable compound) or a cationically polymerizable compound (photocationically polymerizable compound). These are usually used with photopolymerization initiators.
  • the ink may contain one kind of photopolymerizable compound, two or more kinds, and preferably two or more kinds.
  • Examples of the photoradical polymerizable compound include a monomer having an ethylenically unsaturated group (a monomer having an ethylenically unsaturated bond), a monomer having an isocyanate group, and the like.
  • the ethylenically unsaturated group may be a vinyl group, a vinylene group, a vinylidene group, a (meth) acryloyl group or the like, and is preferably a (meth) acryloyl group.
  • “(meth) acryloyl group” means “acryloyl group” and the corresponding "methacryloyl group”. The same applies to the expressions "(meth) acrylate” and "(meth) acrylamide”.
  • the photoradical polymerizable compound is preferably a (meth) acrylate having one (meth) acryloyl group (monofunctional (meth) acrylate) and a (meth) acrylate having two or more (meth) acryloyl groups (polyfunctional). (Meta) acrylate) and included.
  • photocationically polymerizable compound examples include epoxy compounds, oxetane compounds, vinyl ether compounds and the like.
  • the content of the photopolymerizable compound may be, for example, 10 to 60% by mass, 15 to 50% by mass, 20 to 40% by mass, or 20 to 30% by mass, based on the total mass of the ink.
  • the photopolymerization initiator is, for example, a photoradical polymerization initiator or a photocationic polymerization initiator, and known compounds as a photoradical polymerization initiator and a photocationic polymerization initiator can be used.
  • a photoradical polymerization initiator a molecular cleavage type or hydrogen abstraction type photoradical polymerization initiator is suitable.
  • the content of the photopolymerization initiator may be, for example, 0.1 to 40 parts by mass with respect to 100 parts by mass of the photopolymerizable compound.
  • the light-scattering particles are, for example, optically inert inorganic particles.
  • the ink contains light-scattering particles, the light from the light source irradiated to the pixel portion can be scattered, so that excellent optical characteristics (for example, external quantum efficiency) can be obtained.
  • the light-scattering particles preferably contain at least one selected from the group consisting of titanium oxide, alumina, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate, barium titanate and silica, preferably titanium oxide, zirconium oxide, and the like. It is more preferable to contain at least one selected from the group consisting of zinc oxide and barium titanate.
  • the shape of the light-scattering particles may be spherical, filamentous, indefinite, or the like.
  • using particles having less directional particle shape for example, particles having a spherical shape, a regular tetrahedron shape, etc.
  • the average particle diameter (volume average diameter) of the light-scattering particles in the ink is, for example, 0.05 to 1.0 ⁇ m, 0.05 to 0.6 ⁇ m, 0.05 to 0.4 ⁇ m, 0.2 to 1 It may be 0.0 ⁇ m, 0.2 to 0.6 ⁇ m, 0.2 to 0.4 ⁇ m, 0.3 to 1.0 ⁇ m, 0.3 to 0.6 ⁇ m, or 0.3 to 0.4 ⁇ m.
  • the average particle diameter (volume average diameter) of the light-scattering particles in the ink is obtained by measuring with a dynamic light-scattering nanotrack particle size distribution meter and calculating the volume average diameter.
  • the content of the light-scattering particles may be, for example, 0.1 to 10% by mass based on the total mass of the ink.
  • the mass ratio of the content of the light-scattering particles to the content of the luminescent nanocrystal particles may be, for example, 0.05 to 5.0.
  • the polymer dispersant is a polymer compound having a weight average molecular weight of 750 or more and having a functional group having an affinity for light-scattering particles.
  • the polymer dispersant has a function of dispersing light-scattering particles.
  • the polymer dispersant is adsorbed (for example, bonded) to the light-scattering particles via a functional group having an affinity for the light-scattering particles, and light is generated by electrostatic repulsion and / or steric repulsion between the polymer dispersants. Disperses the scattering particles in the ink.
  • the polymer dispersant is preferably bound to the surface of the light-scattering particles and adsorbed to the light-scattering particles, but is bound to the surface of the luminescent nanoparticles and adsorbed to the luminescent nanoparticles. It may be free in the ink.
  • Examples of the functional group having an affinity for light-scattering particles include an acidic functional group, a basic functional group and a nonionic functional group.
  • the acidic functional group has a dissociative proton and may be neutralized by a base such as an amine or a hydroxide ion, and the basic functional group is neutralized by an acid such as an organic acid or an inorganic acid. May be.
  • the polymer dispersant may be, for example, acrylic resin, polyester resin, polyurethane resin, polyamide resin, polyether, phenol resin, silicone resin, polyurea resin, amino resin, epoxy resin, polyamine such as polyethyleneimine and polyallylamine, and polyimide. It may be there.
  • the polymer dispersant can be used as the polymer dispersant, and the commercially available products include Ajinomoto Fine-Techno Co., Ltd.'s Azispar PB series, BYK's DISPERBYK series, BYK-series, and BASF's Efka series. Etc. can be used.
  • the ink of the above embodiment may further contain components (other components) other than the above-mentioned components as long as the effects of the present invention are not impaired.
  • other components include solvents.
  • the solvent include cyclohexane, hexane, heptane, chloroform, toluene, octane, chlorobenzene, tetralin, diphenyl ether, propylene glycol monomethyl ether acetate, butyl carbitol acetate, or a mixture thereof.
  • the photopolymerizable compound When the ink contains a photopolymerizable compound, the photopolymerizable compound also functions as a dispersion medium, so that light-scattering particles and luminescent nanocrystal particles can be dispersed without a solvent.
  • the content of the solvent may be more than 0% by mass and 5% by mass or less based on the total mass of the ink (including the solvent).
  • the ink of the above embodiment may further contain, for example, a thermosetting resin, a curing agent, a curing accelerator (curing catalyst), a polymerization inhibitor, a chain transfer agent, an antioxidant and the like as other components.
  • a thermosetting resin for example, a thermosetting resin, a curing agent, a curing accelerator (curing catalyst), a polymerization inhibitor, a chain transfer agent, an antioxidant and the like as other components.
  • the viscosities of the inks described above are, for example, 2 to 20 mPa ⁇ s, 2 to 15 mPa ⁇ s, 2 to 12 mPa ⁇ s, 5 to 20 mPa ⁇ s, 5 to 15 mPa ⁇ s, 5 to 12 mPa ⁇ s, 7 to 20 mPa ⁇ s. It may be s, 7 to 15 mPa ⁇ s, or 7 to 12 mPa ⁇ s.
  • the viscosity is, for example, the viscosity at the ink temperature when performing inkjet printing, and is the viscosity measured by an E-type viscometer.
  • the ink temperature at the time of performing inkjet printing is preferably 25 to 60 ° C, more preferably 30 to 55 ° C, and even more preferably 30 to 40 ° C.
  • the ink temperature when performing inkjet printing is adjusted by the temperature of the inkjet head when performing inkjet printing.
  • the viscosity of the ink at the ink temperature during inkjet printing is 2 mPa ⁇ s or more, the meniscus shape of the inkjet ink at the tip of the ink ejection hole of the inkjet head is stable, so that the ejection amount and ejection of the inkjet ink are controlled (for example, ejection amount and ejection). (Timing control) becomes easy.
  • the viscosity of the ink at the ink temperature during inkjet printing is 20 mPa ⁇ s or less, the inkjet ink can be smoothly ejected from the ink ejection holes.
  • the surface tension of the ink is preferably a surface tension suitable for the inkjet method, specifically, is preferably in the range of 20 to 40 mN / m, and more preferably 25 to 35 mN / m.
  • discharge control for example, control of discharge amount and discharge timing
  • the flight bending means that when the ink composition is ejected from the ink ejection holes, the landing position of the ink deviates from the target position by 30 ⁇ m or more.
  • the surface tension is 40 mN / m or less, the shape of the meniscus at the tip of the ink ejection hole is stable, so that the ink ejection control (for example, the ejection amount and the ejection timing control) becomes easy.
  • the surface tension is 20 mN / m or more, it is possible to prevent the peripheral portion of the ink ejection hole from being contaminated with the inkjet ink, so that the occurrence of flight bending can be suppressed.
  • a pixel portion may not be accurately filled in the pixel portion forming region to be landed and the ink may be insufficiently filled, or ink may be formed in the pixel portion forming region (or pixel portion) adjacent to the pixel portion forming region to be landed.
  • the composition does not land and the color reproducibility does not deteriorate.
  • the surface tension described in the present specification refers to the surface tension measured at 23 ° C., which is measured by the ring method (also referred to as the ring method).
  • the ink of the above embodiment can be obtained, for example, by mixing and dispersing the constituent components of the above-mentioned ink.
  • the light conversion layer and the color filter of one embodiment the light conversion layer provided with the color filter pixel portion obtained by using the printing method of the above embodiment and the luminescent nanocrystal particle-containing ink of the above embodiment, and A color filter including the light conversion layer will be described.
  • an ink that does not contain luminescent nanoparticles white ink
  • the luminescent nanoparticles-free ink may have the same composition as the luminescent nanoparticles-containing ink of the above-described embodiment except that it does not contain luminescent nanoparticles.
  • FIG. 3 is a schematic cross-sectional view of a color filter including the optical conversion layer of one embodiment.
  • the color filter 100 shown in FIG. 3 includes a base material 40 and an optical conversion layer 30 provided on the base material 40.
  • the light conversion layer 30 includes a plurality of pixel units 10 and a light-shielding unit 20.
  • the optical conversion layer 30 has a first pixel unit 10a, a second pixel unit 10b, and a third pixel unit 10c as the pixel unit 10.
  • the first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c are arranged in a grid pattern so as to repeat in this order.
  • the light-shielding portion 20 is located between adjacent pixel portions, that is, between the first pixel portion 10a and the second pixel portion 10b, between the second pixel portion 10b and the third pixel portion 10c, and the third. It is provided between the pixel portion 10c of the above and the first pixel portion 10a. In other words, these adjacent pixel portions are separated from each other by the light-shielding portion 20.
  • the first pixel portion 10a and the second pixel portion 10b are luminescent pixel portions (light emitting pixel portions) containing a cured product of the luminescent nanocrystal particle-containing ink, respectively.
  • the first pixel portion 10a includes a first curing component 13a, a first luminescent nanocrystal particle 11a and a first light scattering particle 12a dispersed in the first curing component 13a, respectively.
  • the second pixel portion 10b includes the second curing component 13b and the second luminescent nanocrystal particles 11b and the second light scattering particles 12b dispersed in the second curing component 13b, respectively. including.
  • the curing component is, for example, a component obtained by polymerizing a photopolymerizable compound, and includes a polymer of the photopolymerizable compound.
  • the cured component may contain an organic component (organic ligand, polymer dispersant, unreacted polymerizable compound, etc.) contained in the ink.
  • the first curing component 13a and the second curing component 13b may be the same or different, and may be the same as or different from the first light scattering particles 12a. It may be the same as or different from the second light-scattering particle 12b.
  • the first luminescent nanocrystal particles 11a are red luminescent nanocrystal particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having a emission peak wavelength in the range of 605 to 665 nm. That is, the first pixel portion 10a may be paraphrased as a red pixel portion for converting blue light into red light.
  • the second luminescent nanocrystal particle 11b is a green luminescent nanocrystal particle that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having a emission peak wavelength in the range of 500 to 560 nm. That is, the second pixel portion 10b may be paraphrased as a green pixel portion for converting blue light into green light.
  • the content of the luminescent nanocrystal particles in the luminescent pixel portion is, for example, 10 to 80% by mass, 20 to 70% by mass, and 22 to 50% by mass based on the total mass of the cured product of the luminescent nanocrystal particle-containing ink. %, 24-40% by weight or 26-40% by weight.
  • the content of the light-scattering particles in the luminescent pixel portion may be, for example, 0.1 to 10% by mass based on the total mass of the cured product of the luminescent nanocrystal particle-containing ink.
  • the third pixel portion 10c is a non-light emitting pixel portion (non-light emitting pixel portion) containing a cured product of the ink containing no luminescent nanocrystal particles.
  • the cured product does not contain luminescent nanocrystal particles, but contains light-scattering particles and a cured component. That is, the third pixel portion 10c includes a third curing component 13c and a third light scattering particle 12c dispersed in the third curing component 13c.
  • the third curing component 13c is, for example, a component obtained by polymerizing a polymerizable compound and contains a polymer of the polymerizable compound.
  • the third light-scattering particle 12c may be the same as or different from the first light-scattering particle 12a and the second light-scattering particle 12b.
  • the third pixel portion 10c has a transmittance of 30% or more with respect to light having a wavelength in the range of, for example, 420 to 480 nm. Therefore, the third pixel unit 10c functions as a blue pixel unit when a light source that emits light having a wavelength in the range of 420 to 480 nm is used.
  • the transmittance of the third pixel unit 10c can be measured by a microspectroscopy device.
  • the content of the light-scattering particles in the third pixel portion 10c is, for example, 1 to 50% by mass, 5 to 30% by mass, or 10 to 10 to 50% by mass based on the total mass of the cured product of the ink containing no luminescent nanocrystal particles. It may be 20% by mass.
  • the thickness of the pixel portion 10 may be, for example, 1 ⁇ m or more, 2 ⁇ m or more, or 3 ⁇ m or more. There may be.
  • the thickness of the pixel portion 10 may be, for example, 30 ⁇ m or less, 20 ⁇ m or less, or 15 ⁇ m or less. There may be.
  • the light-shielding portion 20 is a so-called black matrix provided for the purpose of separating adjacent pixel portions to prevent color mixing and for the purpose of preventing light leakage from a light source.
  • the material constituting the light-shielding portion 20 is not particularly limited, and the curing of the resin composition in which the binder polymer contains carbon fine particles, metal oxides, inorganic pigments, organic pigments and other light-shielding particles in addition to a metal such as chromium. Objects and the like can be used.
  • the binder polymer used here includes one or a mixture of resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose, photosensitive resin, and O / W.
  • An emulsion-type resin composition for example, an emulsion of reactive silicone
  • the thickness of the light-shielding portion 20 may be, for example, 0.5 ⁇ m or more, and may be 10 ⁇ m or less.
  • the base material 40 is a transparent base material having light transmission, and is, for example, a transparent glass substrate such as quartz glass, Pylex (registered trademark) glass, a synthetic quartz plate, a transparent resin film, an optical resin film, or the like.
  • a flexible base material or the like can be used.
  • a glass substrate made of non-alkali glass that does not contain an alkaline component in the glass.
  • "7059 glass”, “1737 glass”, “Eagle 200” and “Eagle XG” manufactured by Corning Inc., "AN100” manufactured by Asahi Glass Co., Ltd., "OA-10G” and “OA-10G” manufactured by Nippon Electric Glass Co., Ltd. OA-11 ” is suitable. These are materials with a small thermal expansion rate and are excellent in dimensional stability and workability in high temperature heat treatment.
  • the color filter 100 provided with the above optical conversion layer 30 is suitably used when a light source that emits light having a wavelength in the range of 420 to 480 nm is used.
  • optical conversion layer and the color filter of one embodiment have been described above, the optical conversion layer and the color filter formed by using the printing method of the present invention are not limited to the above embodiment.
  • the optical conversion layer is a pixel containing a cured product of a luminescent nanocrystal particle-containing ink containing blue luminescent nanocrystal particles in place of the third pixel portion 10c or in addition to the third pixel portion 10c.
  • a unit blue pixel unit
  • the optical conversion layer includes a pixel portion (for example, a yellow pixel portion) containing a cured product of a luminescent nanocrystal particle-containing ink containing nanocrystal particles that emit light of colors other than red, green, and blue. You may. In these cases, it is preferable that each of the luminescent nanocrystal particles contained in each pixel portion of the optical conversion layer has an absorption maximum wavelength in the same wavelength range.
  • the pixel portion of the light conversion layer may contain a cured product of an ink (composition) containing a pigment other than the luminescent nanocrystal particles.
  • the color filter may be provided with an ink-repellent layer made of a material having an ink-repellent property narrower than that of the light-shielding portion on the pattern of the light-shielding portion.
  • an ink-repellent layer instead of providing an ink-repellent layer, a photocatalyst-containing layer as a wettable variable layer is formed in a solid coating shape in a region including a pixel portion forming region, and then light is applied to the photocatalyst-containing layer via a photomask. Irradiation may be performed for exposure to selectively increase the parental ink property of the pixel portion forming region.
  • the photocatalyst include titanium oxide and zinc oxide.
  • the color filter may be provided with an ink receiving layer containing hydroxypropyl cellulose, polyvinyl alcohol, gelatin, etc. between the base material and the pixel portion.
  • the color filter may be provided with a protective layer on the pixel portion.
  • This protective layer flattens the color filter and prevents the components contained in the pixel portion, or the components contained in the pixel portion and the components contained in the photocatalyst-containing layer from elution into the liquid crystal layer. It is provided.
  • a material used as a known protective layer for a color filter can be used.
  • the pixel portion of the light conversion layer of the present embodiment may further contain a pigment having substantially the same color as the luminescent color of the luminescent nanocrystal particles.
  • the pigment may be contained in the luminescent nanocrystal particle-containing ink.
  • the pixel portion may contain a coloring material without containing crystal particles.
  • a known color material can be used.
  • a diketopyrrolopyrrole pigment and / or an anionic red organic dye is used as the color material used for the red pixel portion (R).
  • Examples of the coloring material used for the green pixel portion (G) include at least one selected from the group consisting of a halogenated copper phthalocyanine pigment, a phthalocyanine-based green dye, and a mixture of a phthalocyanine-based blue dye and an azo-based yellow organic dye.
  • Examples of the coloring material used for the blue pixel portion (B) include an ⁇ -type copper phthalocyanine pigment and / or a cationic blue organic dye. The amount of these coloring materials used is 1 to 5% by mass based on the total mass of the pixel portion (cured product of ink) from the viewpoint of preventing a decrease in transmittance when contained in the optical conversion layer. It is preferable to have.
  • the color filter may be provided with a normal color filter layer containing the above-mentioned coloring material without containing luminescent nanocrystal particles between the base material and the pixel portion of the present embodiment. That is, the color filter of the present embodiment includes a base material, a color filter layer provided on the base material that does not contain luminescent nanoparticles and contains a coloring material, and a present color filter layer provided on the color filter layer. It may be provided with the pixel portion of the embodiment.
  • the color filter pixel portion 10 (first to third pixel portions 10a, 10b, 10c) in the color filter 100 (optical conversion layer 30) of the above embodiment is, for example, a group having a light-shielding portion 20 formed in a pattern.
  • Ink (light emission) using the printing method of the above embodiment printing method of luminescent nanocrystal particle-containing ink using the inkjet printing apparatus 1 in the pixel portion forming region partitioned by the light-shielding portion 20 on the material 40. It can be formed by printing an ink containing sex nanocrystal particles and an ink not containing luminescent nanocrystal particles to form a printed matter, and then curing the obtained printed matter.
  • the printed matter of ink is formed by selectively adhering the ink ejected in the above-mentioned ejection process to the pixel portion forming region on the base material 40.
  • the organic solvent is removed from the ink by drying.
  • the method for drying the ink is preferably decompression drying (decompression drying). Drying under reduced pressure is usually carried out at 20 to 30 ° C. for 3 to 30 minutes under a pressure of 1.0 to 500 Pa from the viewpoint of controlling the composition of the ink.
  • Curing of the printed matter of ink is performed by irradiating the printed matter with light (active energy rays).
  • light active energy rays
  • a mercury lamp, a metal halide lamp, a xenon lamp, an LED or the like may be used for curing the ink.
  • the wavelength of the light to be irradiated may be, for example, 200 nm or more, and may be 440 nm or less.
  • the exposure amount may be, for example, 10 mJ / cm 2 or more, and may be 20000 mJ / cm 2 or less.
  • the optical conversion layer 30 is formed. Therefore, the above method can also be said to be a method for forming the optical conversion layer 30.
  • the method for forming the light conversion layer 30 may further include a step of forming the light-shielding portion 20 in addition to the step of forming the color filter pixel portion 10.
  • a metal thin film such as chromium or a thin film of a resin composition containing light-shielding particles is formed in a region serving as a boundary between a plurality of pixel portions on one surface side of the base material 40. Examples thereof include a method of forming and patterning this thin film.
  • the metal thin film can be formed by, for example, a sputtering method, a vacuum vapor deposition method, or the like, and the thin film of the resin composition containing the light-shielding particles can be formed, for example, by a method such as coating or printing. Examples of the method for patterning include a photolithography method and the like.
  • 1 ... Inkjet printing device 2 ... Ink storage container, 2a ... Main tank (first ink storage container), 2b ... Reserve tank (second ink storage container), 2c ... Sub tank (third ink storage container), 3 ... Discharge head, 4 ... Ink flow path, 10 ... Pixel part, 10a ... First pixel part, 10b ... Second pixel part, 10c ... Third pixel part, 11a ... First luminescent nanocrystal particles , 11b ... second luminescent nanocrystal particles, 12a ... first light-scattering particles, 12b ... second light-scattering particles, 12c ... third light-scattering particles, 20 ... light-shielding parts, 30 ... light. Conversion layer, 40 ... base material, 100 ... color filter.

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Abstract

L'invention concerne un procédé d'impression d'encre contenant des particules de nanocristal luminescent dans un style à jet d'encre tout en réduisant au minimum la désactivation des particules de nanocristal luminescent dans un dispositif. Ce procédé d'impression d'encre contenant des particules de nanocristal luminescent utilise un dispositif d'impression à jet d'encre comprenant un récipient de stockage d'encre et une tête d'éjection, le procédé d'impression comprenant une étape d'alimentation en encre dans laquelle une partie de l'encre contenant des particules de nanocristal luminescent stockées dans le récipient de stockage d'encre est alimentée à la tête d'éjection et une étape d'éjection dans laquelle l'encre contenant des particules de nanocristal luminescent est éjectée de la tête d'éjection, le récipient de stockage d'encre est conçu de telle sorte que le volume d'un espace de stockage d'encre dans lequel l'encre contenant des particules de nanocristal luminescent est stockée peut être changé, l'espace de stockage d'encre est rétracté lorsque l'encre contenant des particules de nanocristal luminescent est alimentée dans l'étape d'alimentation en encre, et l'air extérieur est empêché de s'écouler dans le récipient de stockage d'encre en maintenant l'espace de stockage d'encre dans l'état rétracté.
PCT/JP2021/046521 2020-12-28 2021-12-16 Procédé d'impression d'encre contenant des particules de nanocristal luminescent, procédé de formation d'une section de pixel de filtre de couleur, et filtre de couleur WO2022145252A1 (fr)

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JP2020218928A JP2024021086A (ja) 2020-12-28 2020-12-28 発光性ナノ結晶粒子含有インクの印刷方法、カラーフィルタ画素部の形成方法、及び、カラーフィルタ
JP2020-218928 2020-12-28

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WO2022145252A1 true WO2022145252A1 (fr) 2022-07-07

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JPH05138898A (ja) * 1991-11-18 1993-06-08 Canon Inc インク容器、これを用いた記録ヘツドユニツトおよびこれを搭載する記録装置
JP2015092549A (ja) * 2013-10-04 2015-05-14 キヤノン株式会社 液体吐出装置、液漏れ抑制方法、インプリント装置および部品の製造方法
JP2019532473A (ja) * 2016-10-12 2019-11-07 カティーバ， インコーポレイテッド 量子ドットおよびそのインクジェット印刷技法を利用するディスプレイデバイス
JP2020015895A (ja) * 2018-07-13 2020-01-30 Dic株式会社 インク組成物、光変換層及びカラーフィルタ
JP2021017260A (ja) * 2019-07-19 2021-02-15 Dic株式会社 インク組成物容器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05138898A (ja) * 1991-11-18 1993-06-08 Canon Inc インク容器、これを用いた記録ヘツドユニツトおよびこれを搭載する記録装置
JP2015092549A (ja) * 2013-10-04 2015-05-14 キヤノン株式会社 液体吐出装置、液漏れ抑制方法、インプリント装置および部品の製造方法
JP2019532473A (ja) * 2016-10-12 2019-11-07 カティーバ， インコーポレイテッド 量子ドットおよびそのインクジェット印刷技法を利用するディスプレイデバイス
JP2020015895A (ja) * 2018-07-13 2020-01-30 Dic株式会社 インク組成物、光変換層及びカラーフィルタ
JP2021017260A (ja) * 2019-07-19 2021-02-15 Dic株式会社 インク組成物容器

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