WO2016075949A1 - Élément de conversion de longueur d'onde, unité de rétroéclairage le comprenant et appareil d'affichage à cristaux liquides - Google Patents

Élément de conversion de longueur d'onde, unité de rétroéclairage le comprenant et appareil d'affichage à cristaux liquides Download PDF

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WO2016075949A1
WO2016075949A1 PCT/JP2015/005685 JP2015005685W WO2016075949A1 WO 2016075949 A1 WO2016075949 A1 WO 2016075949A1 JP 2015005685 W JP2015005685 W JP 2015005685W WO 2016075949 A1 WO2016075949 A1 WO 2016075949A1
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Prior art keywords
wavelength conversion
layer
film
light
conversion member
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PCT/JP2015/005685
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English (en)
Japanese (ja)
Inventor
亮 佐竹
伊藤　英明
誠 加茂
隆 米本
浩史 遠山
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富士フイルム株式会社
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Priority claimed from JP2015127583A external-priority patent/JP2016102999A/ja
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to KR1020177012940A priority Critical patent/KR20170074908A/ko
Publication of WO2016075949A1 publication Critical patent/WO2016075949A1/fr
Priority to US15/593,903 priority patent/US20170248748A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements

Definitions

  • the present invention relates to a wavelength conversion member having a wavelength conversion layer including a quantum dot that emits fluorescence when irradiated with excitation light, a backlight unit including the wavelength conversion member, and a liquid crystal display device.
  • the liquid crystal display device is composed of at least a backlight and a liquid crystal cell, and usually further includes members such as a backlight side polarizing plate and a viewing side polarizing plate.
  • the wavelength conversion member of the backlight unit has a structure including a wavelength conversion layer containing quantum dots (also referred to as Quantum Dot, QD, quantum dots) as a light emitting material. It is attracting attention (see Patent Document 1).
  • the wavelength conversion member is a member that converts the wavelength of light incident from the planar light source and emits it as white light.
  • the wavelength conversion layer that includes the quantum dots as the light emitting material two or three of different light emission characteristics are used.
  • White light can be realized by using fluorescence in which a seed quantum dot is excited by light incident from a planar light source and emits light.
  • Fluorescence due to quantum dots has high brightness and a small half-value width, so that LCDs using quantum dots are excellent in color reproducibility.
  • the color gamut of the LCD has been expanded from 72% to 100% of the TV standard (NTSC (National Television System Committee)) ratio.
  • QD layer a layer containing quantum dots
  • QD layer needs to suppress intrusion of moisture and oxygen.
  • moisture enters the QD layer there is a problem that the dimensional change is likely to occur in the QD layer, and the QD layer is easily deteriorated by a heating process such as a DRY durability test, and as a result, peeling at the interface of the QD layer is likely to occur.
  • oxygen enters the QD layer there is a problem in that the quantum dots are photooxidized by contact with oxygen and the emission intensity decreases.
  • Patent Document 1 In order to solve such problems, in order to protect the quantum dots from oxygen and moisture entering from the outside, a barrier that suppresses the penetration of moisture (water vapor) and oxygen outside the layer containing the quantum dots in the wavelength conversion member. Providing a film has been proposed (Patent Document 1, etc.).
  • the barrier film is usually an embodiment in which the substrate itself is used as a barrier film by using a substrate having oxygen and water vapor barrier properties as a support for sandwiching a layer containing quantum dots, or an oxygen barrier property on the surface of the support.
  • a substrate having oxygen and water vapor barrier properties as a support for sandwiching a layer containing quantum dots, or an oxygen barrier property on the surface of the support.
  • steam barrier property, etc. are known.
  • inorganic barrier layer having oxygen barrier properties and water vapor barrier properties inorganic layers such as inorganic oxides, inorganic nitrides, inorganic oxynitrides and metals are preferably used.
  • the provision of a barrier film outside the layer containing quantum dots can suppress oxygen and moisture from entering the layer containing quantum dots to some extent. That's not true.
  • the layer containing quantum dots is exposed to the outside air on the cut side, so from the cut side Measures against invasion of oxygen and moisture are also necessary.
  • Patent Documents 2 and 3 disclose a structure in which a film containing quantum dots contains a light emission stabilizer, and since the light emission stabilizer is present in a layer containing quantum dots, oxygen that has permeated through the barrier film. It is described that it is possible to reduce the influence of moisture, moisture, and oxygen and moisture entering from the side. However, the light emission stabilizer needs to be added to the polymerizable composition containing quantum dots before the wavelength conversion layer is cured, and may affect the curing reaction of the polymerizable composition containing quantum dots. There is sex.
  • the object of the present invention is to provide a wavelength conversion member that can be produced without any deterioration, and that the separation of the interface of the wavelength conversion layer including the quantum dots hardly occurs and the light emission intensity does not easily decrease.
  • Another object of the present invention is to provide a high-brightness backlight unit and a liquid crystal display device in which the separation of the interface of the wavelength conversion layer containing quantum dots hardly occurs and the light emission intensity does not easily decrease.
  • the wavelength conversion member of the present invention includes a wavelength conversion layer including both at least one quantum dot that is excited by excitation light and emits fluorescence, and a getter agent that captures at least one of moisture and oxygen, and a wavelength It comprises a barrier layer formed on at least one surface of the conversion layer, and the wavelength conversion layer is a layer obtained by curing a polymerizable composition containing quantum dots and a getter agent.
  • the moisture permeability of the barrier layer is described in G. NISATO, PCPBOUTEN, PJSLIKKERVEER et al., SID Conference Record of the International Display Research Conference, pages 1435-1438, at a measurement temperature of 40 ° C. and a relative humidity of 90% RH. It is the value measured using the method (calcium method).
  • the unit of moisture permeability is [g / (m 2 ⁇ day ⁇ atm)].
  • the moisture permeability of 0.1 g / (m 2 ⁇ day ⁇ atm) or less means that the moisture permeability of the SI unit system is 1.14 ⁇ 10 ⁇ 11 g / (m 2 ⁇ s ⁇ Pa) or less. means.
  • the barrier layer means a layer that suppresses permeation of oxygen and moisture.
  • the oxygen permeability of the barrier layer is not particularly limited, but is 1.0 cm 3 / (m 2 ⁇ day ⁇ atm) or less (1.14 ⁇ 10 ⁇ 1 fm / (s ⁇ Pa) or less in SI units). Is preferred.
  • the oxygen permeability means a measured value under conditions of a measurement temperature of 23 ° C. and a relative humidity of 90% RH.
  • the getter agent is preferably a compound or composition that adsorbs moisture and oxygen.
  • the getter agent may be uniformly dispersed in the wavelength conversion layer, or may be unevenly distributed in the layer boundary region in the wavelength conversion layer.
  • the getter agent is uniformly dispersed in the wavelength conversion layer means that when the cross section in the thickness direction of the wavelength conversion layer is observed, it is divided into three regions (layer boundary side B1). , B2 and central layer C) (see FIG. 7) means that the area ratio of the getter agent in each region is 0.5 or more and 2 or less in the ratio of the two regions. Further, the ratio of the occupied area ratio is an average value of values calculated in three thickness direction cross sections in the wavelength conversion layer.
  • the getter agent is unevenly distributed in the layer boundary region in the wavelength conversion layer” means that the occupied area ratio on the layer boundary side B1 is S B1 and the occupied area ratio on the layer boundary side B2 is S B2 .
  • the ratio of the occupied area ratio S C of the middle layer C S B1 / S C> 2 or is intended to mean that the S B2 / S C> 2.
  • the area occupied by the getter agent is a value obtained by dividing the total area occupied by the getter agent by the layer cross-sectional area when observing the cross section in the thickness direction of the wavelength conversion layer.
  • Measurement of specific occupying area ratio is transmissive to observe the cross-section in the thickness direction of the wavelength conversion layer by electron microscopy (TEM), measuring the occupied area ratio of the getter material particles occupied in the measurement area S B1, S B2, S C did.
  • the TEM spot size was 1 nm
  • the observation magnification was 30000 times
  • three fields of view were measured for each of the three layer regions.
  • the spot size and magnification can be appropriately adjusted according to the layer thickness of the wavelength conversion layer and the particle size of the getter agent.
  • the getter agent is at least selected from metal oxides, metal halides, metal sulfates, metal perchlorates, metal carbonates, metal alkoxides, metal carboxylates, metal chelates, or zeolites (aluminosilicates). Preferably it contains one compound.
  • the wavelength conversion member of the present invention may have an aspect in which at least one adhesive layer is provided between the wavelength conversion layer and the barrier layer.
  • the barrier layer is preferably a layer containing silicon oxide, silicon nitride, silicon carbide, or aluminum oxide. It is preferable to provide a light diffusion layer on the surface of the barrier layer opposite to the surface on the wavelength conversion layer side.
  • the barrier layer is preferably provided on both sides of the wavelength conversion layer.
  • the backlight unit of the present invention is A light source that emits primary light; A wavelength conversion member of the present invention provided on a light source; A retroreflective member disposed opposite the light source across the wavelength conversion member; A backlight unit comprising a wavelength conversion member and a reflector disposed opposite to the light source, The wavelength conversion member emits fluorescence using at least a part of the primary light emitted from the light source as excitation light, and emits at least light including secondary light composed of the fluorescence.
  • the liquid crystal display device of the present invention includes a backlight unit and a liquid crystal cell unit disposed opposite to the retroreflective member side of the backlight unit.
  • the “half width” of a peak refers to the width of the peak at a peak height of 1/2.
  • light having the emission center wavelength in the wavelength band of 430 to 480 nm is called blue light
  • light having the emission center wavelength in the wavelength band of 500 to 600 nm is called green light
  • the emission center wavelength is in the wavelength band of 600 to 680 nm.
  • the light having a color is called red light.
  • the wavelength conversion member of the present invention is a wavelength conversion member having a wavelength conversion layer including quantum dots that emit fluorescence when irradiated with excitation light, and has a moisture permeability of 0.1 g / () formed on at least one surface of the wavelength conversion layer. m 2 ⁇ day ⁇ atm) or less, and the wavelength conversion layer is a layer obtained by curing a polymerizable composition containing quantum dots and a getter agent. Since the wavelength conversion member having such a configuration can effectively capture oxygen or moisture that has entered the wavelength conversion layer including the quantum dots, the time-dependent dimensional change of the wavelength conversion layer and the heating process such as the DRY durability test are performed.
  • the getter agent does not adversely affect the curing reaction of the polymerizable composition containing quantum dots. Therefore, according to the present invention, it can be produced without adversely affecting the curing reaction of the polymerizable composition containing quantum dots, and peeling of the interface of the wavelength conversion layer containing quantum dots hardly occurs, resulting in a decrease in emission intensity. It is possible to provide a wavelength conversion member that is difficult to perform.
  • FIG. 1 is a schematic cross-sectional view of a backlight unit including a wavelength conversion member according to this embodiment.
  • FIGS. 2A and 2B are a first embodiment and a second embodiment, respectively, of the wavelength conversion member according to the present invention.
  • FIG. 1 the scale of each part is appropriately changed and shown for easy visual recognition.
  • a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • the backlight unit 2 includes a light source 1A that emits primary light (blue light L B ) and a light guide plate 1B that guides and emits the primary light emitted from the light source 1A.
  • the shape of the wavelength conversion member 1D is not particularly limited, and may be an arbitrary shape such as a sheet shape or a bar shape.
  • L B , L G , and L R emitted from the wavelength conversion member 1D are incident on the retroreflective member 2B, and each incident light is transmitted between the retroreflective member 2B and the reflector 2A. The reflection is repeated and passes through the wavelength conversion member 1D many times.
  • a sufficient amount of excitation light blue light L B
  • a necessary amount of fluorescence L G , L R
  • the white light LW is embodied and emitted from 2B.
  • the ultraviolet light as the excitation light is incident on the wavelength conversion layer 30 including the quantum dots 30A, 30B, and 30C, whereby red light emitted from the quantum dots 30A and the quantum dots 30B are emitted.
  • White light can be realized by the emitted green light and the blue light emitted by the quantum dots 30C.
  • wavelength conversion member 1 ⁇ / b > D is formed on the surface of the wavelength conversion layer 30 and the wavelength conversion layer 30 including quantum dots 30 ⁇ / b > A and 30 ⁇ / b > B that are excited by excitation light (L B ) and emit fluorescence (L G , L R ). And barrier layers 12 and 22 (FIGS. 2A and 2B).
  • the wavelength conversion member 1D has an upper side (barrier film 20 side) on the retroreflective member 2B side in the backlight unit 2, and a lower side (barrier film 10 side) on the planar light source 1C side. It is. Oxygen and moisture that have entered the wavelength conversion member 1D have a configuration in which the barrier films 10 and 20 prevent entry into the wavelength conversion layer 30 on the retroreflective member 2B side and the planar light source 1C side. .
  • the wavelength conversion member is provided with a barrier film outside the layer containing quantum dots, thereby suppressing oxygen and moisture from entering the quantum dot layer to some extent. Can be, but not enough.
  • the present inventor has intensively studied a method for preventing deterioration of the wavelength conversion layer and reduction in emission intensity by capturing oxygen and moisture that have entered the wavelength conversion layer in the wavelength conversion layer.
  • the present inventor has studied an oxygen or moisture scavenger that does not adversely affect the curing reaction of the polymerizable composition even when added to the polymerizable composition containing quantum dots.
  • getter agents gettering agents
  • gettering agents that are added to the sealing portions of the devices in order to suppress the entry of oxygen and moisture in the outside air into the photoelectric conversion portions are such scavengers. It was found that it is possible to effectively capture oxygen or moisture that has entered the wavelength conversion layer containing quantum dots.
  • the present inventors when added to the wavelength conversion layer, function not only as a moisture and oxygen scavenger but also as a scatterer. In addition to the trapping effect, the present inventors have found that the primary light is scattered with high efficiency in the wavelength conversion layer to greatly increase the wavelength conversion efficiency and the light emission luminance is greatly increased.
  • the wavelength conversion member 1D includes quantum dots 30A and 30B that are excited by excitation light (L B ) to emit fluorescence (L G , L R ), moisture, and oxygen.
  • the wavelength conversion layer 30 includes quantum dots 30 ⁇ / b> A, It is a layer obtained by curing a polymerizable composition containing 30B and the getter agent 40.
  • the wavelength conversion layer 30 includes the barrier films 10 and 20 on both main surfaces (surfaces), and the barrier films 10 and 20 are respectively the support 11 and the support film 11. 21 and barrier layers 12 and 22 supported on the surface thereof.
  • the barrier films 10 and 20 are arranged so that the barrier layers 12 and 22 are on the wavelength conversion layer 30 side, but the present invention is not limited to this mode.
  • the barrier layers 12 and 22 are shown about the aspect formed on the support bodies 11 and 21, it is not restrict
  • the barrier film 10 includes an unevenness imparting layer (matte layer) 13 that imparts an uneven structure on the surface opposite to the surface on the wavelength conversion layer 30 side.
  • the unevenness imparting layer 13 also has a function as a light diffusion layer.
  • Wavelength conversion layer 30 has a quantum dot 30A that emits when excited fluorescence (red light) L R by the blue light L B in the organic matrix 30P, a being excited by the blue light L B fluorescence (green light) L G
  • the quantum dots 30B that emit light are dispersed.
  • the quantum dots 30A and 30B are greatly illustrated for easy visual recognition, but actually, for example, the diameter of the quantum dots is 2 with respect to the thickness of the wavelength conversion layer 30 of 50 to 100 ⁇ m. About 7 nm.
  • the thickness of the wavelength conversion layer 30 is preferably in the range of 1 to 500 ⁇ m, more preferably in the range of 10 to 250 ⁇ m, and still more preferably in the range of 30 to 150 ⁇ m.
  • a thickness of 1 ⁇ m or more is preferable because a high wavelength conversion effect can be obtained. Further, it is preferable that the thickness is 500 ⁇ m or less because the backlight unit can be thinned when incorporated in the backlight unit.
  • the shape of the wavelength conversion layer is not particularly limited, and can be an arbitrary shape.
  • the dispersion state of the getter agent 40 in the wavelength conversion layer 30 is different. As shown in each figure, the getter agent 40 is different from the wavelength converter in the first embodiment. In the second embodiment, the getter agent 40 is unevenly distributed in the layer boundary region between the wavelength conversion layer 30 and the adjacent barrier layer 22 in the wavelength conversion layer 30. It is the aspect which consists of.
  • the getter agent 40 is a substance that captures at least one of oxygen and moisture. Therefore, if the getter agent 40 is present in the wavelength conversion layer 30, the moisture and / or oxygen that has entered the wavelength conversion layer 30 is removed. There is an effect to capture. Further, as already described, the getter agent present in the wavelength conversion layer 30 functions not only as a moisture and / or oxygen scavenger but also as a scatterer, so that the primary light is highly efficiently generated in the wavelength conversion layer. It has the effect of greatly increasing the wavelength conversion efficiency by scattering, and also has the effect of improving the light emission luminance.
  • the getter agent 40 is a fine particle made of an inorganic material to be described later, and thus functions as an inorganic filler (shape stability, mechanical strength) by being uniformly dispersed in the wavelength conversion layer. Improvement effect, heat resistance improvement effect, etc.). Therefore, in the first embodiment, in addition to the effect of enhancing the dimensional stability by capturing oxygen or moisture, the effect of enhancing the dimensional stability by the inorganic filler can be obtained, and the peeling at the interface of the wavelength conversion layer can be further performed. It is possible to realize a wavelength conversion member that does not easily occur.
  • the getter agent 40 is unevenly distributed in the layer boundary region between the wavelength conversion layer 30 and the adjacent barrier layer 22 in the wavelength conversion layer 30 as in the second embodiment shown in FIG. Oxygen or moisture that has entered through the layer can be captured more effectively. Furthermore, in the second embodiment, the effect as the scatterer can be effectively obtained on the light emitting side of the wavelength conversion layer 30, so that the light emission luminance improving effect can be greatly enhanced.
  • a coating layer that covers the surface of the wavelength conversion layer 30 may be provided between the wavelength conversion layer 30 and the barrier layer 22 (not shown).
  • the coating layer has functions such as improving adhesion with the barrier layer by smoothing the outermost surface of the QD layer, protecting the QD layer, and adjusting optical properties.
  • the organic matrix 30P includes a polymer (polymer), and the wavelength conversion layer 30 includes the quantum dots 30A and 30B, the getter agent 40, and a polymerization that is polymerized into the organic matrix 30P. It can form from the polymeric composition (henceforth a quantum dot containing polymeric composition hereafter) containing a crystalline compound. That is, the wavelength conversion layer 30 is a cured layer obtained by curing the quantum dot-containing polymerizable composition. The getter agent 40 does not adversely affect the curing reaction of the polymerizable composition containing quantum dots.
  • the wavelength conversion member 1D can effectively suppress the intrusion of oxygen or moisture into the wavelength conversion layer 30 including the quantum dots, the time-dependent dimensional change of the wavelength conversion layer 30 and the heating such as the DRY durability test Peeling of the interface of the wavelength conversion layer due to deterioration due to the process is unlikely to occur, the decrease in emission intensity due to photooxidation of the quantum dots is small, and it can be produced without adversely affecting the curing reaction of the quantum dot-containing polymerizable composition .
  • FIGS. 3A and 3B are aspects (third and fourth embodiments) in which an adhesive layer 50 is provided between the wavelength conversion layer 30 and the barrier layer 22 in FIGS. 2A and 2B, respectively.
  • the wavelength conversion member 1D of the first and second embodiments of FIG. 2A and FIG. 2B forms a coating film of the quantum dot-containing polymerizable composition on the barrier film 10 and then applies the coating film. Since the wavelength conversion layer 30 is formed by overlapping the barrier film 20 before curing and then curing the coating film, no adhesive layer is required between the wavelength conversion layer 30 and the barrier layer 22.
  • 3B has formed the coating film of the quantum dot-containing polymerizable composition on the barrier film 10 and then cured the coating film to form the wavelength conversion layer 30,
  • the barrier film 20 is manufactured by overlapping. Therefore, the wavelength conversion layer 30 and the barrier layer 22 are attached by the adhesive layer 50.
  • FIGS. 3A and 3B have the same configuration as that of FIGS. 2A and 2B, respectively, except that the adhesive layer 50 is provided. Therefore, in the embodiment shown in FIGS. 3A and 3B, the first embodiment and the first embodiment are the same. The same effects as those of the second embodiment are obtained. Next, the quantum dot-containing polymerizable composition will be described.
  • the quantum dot-containing polymerizable composition includes quantum dots 30A and 30B, a getter agent 40, and a polymerizable compound that is polymerized to become an organic matrix 30P.
  • the quantum dot-containing polymerizable composition can contain other components such as a polymerization initiator and a silane coupling agent.
  • the method for preparing the quantum dot-containing polymerizable composition is not particularly limited and may be carried out according to a general procedure for preparing a polymerizable composition.
  • the getter agent may be added at the final timing of preparation of the composition. It is preferable because there are few factors that reduce the oxygen and moisture scavenging properties of the agent.
  • Quantum dots may contain different two or more quantum dot emission characteristics, in this embodiment, quantum dots, and quantum dots 30A are excited by the blue light L B which emits fluorescence (red light) L R a quantum dot 30B that emits when excited by the blue light L B fluorescence (green light) L G. Moreover, the quantum dots 30A are excited by ultraviolet light L UV to emit fluorescence (red light) L R, and the quantum dots 30B that emits fluorescence (green light) L G is excited by the ultraviolet light L UV, ultraviolet light L UV by being excited can also include quantum dots 30C that emits fluorescence (blue light) L B.
  • the known quantum dots include a quantum dot 30A (emitting red light) in the wavelength band of 600 nm to 680 nm, and a quantum dot 30B (green) having an emission center wavelength in the wavelength band of 500 nm to 600 nm.
  • Quantum dot 30C emitting blue light having an emission center wavelength in a wavelength band of 400 nm to 500 nm is known.
  • quantum dots in addition to the above description, for example, JP 2012-169271 A paragraphs 0060 to 0066 can be referred to, but the quantum dots are not limited thereto.
  • the quantum dots commercially available products can be used without any limitation.
  • the emission wavelength of the quantum dots can usually be adjusted by the particle composition, size, and composition and size.
  • Quantum dots may be added to the polymerizable composition in the form of particles, or may be added in the form of a dispersion dispersed in a solvent.
  • the addition in the state of a dispersion is preferable from the viewpoint of suppressing the aggregation of the quantum dot particles.
  • the solvent used here is not particularly limited.
  • the quantum dots can be added in an amount of, for example, about 0.01 to 10 parts by mass with respect to 100 parts by mass of the total amount of the quantum dot-containing polymerizable composition.
  • the quantum dot content is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass with respect to the total mass of the polymerizable compound contained in the polymerizable composition. preferable.
  • the getter agent is a compound or composition that captures at least one of moisture and oxygen and does not adversely affect the curing of the quantum dot-containing polymerizable composition, such as inhibition of polymerization of the polymerizable compound. is there.
  • the getter agent 40 is preferably a compound or composition that adsorbs moisture and oxygen.
  • the getter agent 40 preferably has a high function as a scatterer.
  • getter agent 40 a known substance used as a getter agent of an organic EL element can be used, and either an inorganic getter agent or an organic getter agent may be used, and a metal oxide, a metal halide, a metal sulfate, It is preferable to include at least one compound selected from metal perchlorate, metal carbonate, metal alkoxide, metal carboxylate, metal chelate, or zeolite (aluminosilicate).
  • getter agents include calcium oxide (CaO), barium oxide (BaO), magnesium oxide (MgO), strontium oxide (SrO), lithium sulfate (Li 2 SO 4 ), sodium sulfate (Na 2 SO 4 ), calcium sulfate.
  • the organic getter agent is not particularly limited as long as it is a material that takes in water by a chemical reaction and does not become opaque before and after the reaction.
  • organometallic compounds such as metal alkoxides, metal carboxylates, and metal chelates are preferable because of their water trapping ability.
  • the organometallic compound means a compound having a metal-carbon bond, a metal-oxygen bond, a metal-nitrogen bond, or the like.
  • the aforementioned bond is broken by the hydrolysis reaction to form a metal hydroxide.
  • hydrolytic polycondensation may be performed after the reaction with the metal hydroxide to increase the molecular weight.
  • an organic metal compound that has good reactivity with water that is, a metal atom that easily breaks various bonds with water.
  • a metal atom that easily breaks various bonds with water include aluminum, silicon, titanium, zirconium, bismuth, strontium, calcium, copper, sodium, and lithium.
  • cesium, magnesium, barium, vanadium, niobium, chromium, tantalum, tungsten, chromium, indium, iron, and the like can be given.
  • a desiccant of an organometallic compound having aluminum as a central metal is preferable in terms of dispersibility in a resin and reactivity with water.
  • Organic groups include unsaturated hydrocarbons such as methoxy group, ethoxy group, propoxy group, butoxy group, 2-ethylhexyl group, octyl group, decyl group, hexyl group, octadecyl group, stearyl group, saturated hydrocarbon, branched unsaturated carbon Examples include ⁇ -diketonato groups such as alkoxy groups, carboxyl groups, aceethylacetonato groups, and dipivaloylmethanato groups containing hydrogen, branched saturated hydrocarbons, and cyclic hydrocarbons.
  • aluminum ethyl acetoacetates having 1 to 8 carbon atoms represented by the following chemical formula (Chemical Formula 1) are preferably used because they can form a sealing composition having excellent transparency.
  • R 5 to R 8 represent an organic group including an alkyl group having 1 to 8 carbon atoms, an aryl group, an alkoxy group, a cycloalkyl group, and an acyl group, and M represents a trivalent metal atom.
  • R 5 to R 8 may be the same or different organic groups.
  • the above-mentioned aluminum ethyl acetoacetates having 1 to 8 carbon atoms are commercially available from, for example, Kawaken Fine Chemical Co., Ltd. and Hope Pharmaceutical Co., Ltd.
  • the getter agent 40 is in the form of particles or powder.
  • the average particle size of the getter agent 40 may be usually in the range of less than 20 ⁇ m, preferably 10 ⁇ m or less, more preferably 2 ⁇ m or less, and even more preferably 1 ⁇ m or less. From the viewpoint of scattering properties, the average particle size of the getter agent 40 is preferably 0.3 to 2 ⁇ m, and more preferably 0.5 to 1.0 ⁇ m.
  • the average particle diameter here refers to the average value of the particle diameters calculated from the particle size distribution measured by the dynamic light scattering method.
  • the getter agent is preferably 0.1% by mass or more with respect to the total mass of the quantum dot-containing polymerizable composition, from the viewpoint of capturing oxygen or moisture, The content is more preferably at least 1% by mass, and even more preferably at least 1% by mass.
  • getter agents may be altered by the adsorption of moisture and oxygen. The altered getter agent may induce decomposition of the quantum dot-containing polymerizable composition, resulting in a decrease in adhesion, a deterioration in brittleness, and a decrease in quantum dot luminous efficiency.
  • the getter agent is preferably 20% by mass or less, more preferably 15% by mass or less, and further preferably 10% by mass or less.
  • the polymerizable compound contained in the quantum dot-containing polymerizable composition is not particularly limited, but a radical polymerizable compound is preferable.
  • the radically polymerizable compound is preferably a monofunctional or polyfunctional (meth) acrylate monomer from the viewpoint of the transparency and adhesion of the cured film after curing. It may be a polymer or a polymer.
  • description with "(meth) acrylate” shall be used by the meaning of at least one of an acrylate and a methacrylate, or either. The same applies to “(meth) acryloyl” and the like.
  • Monofunctional (meth) acrylate monomers include acrylic acid and methacrylic acid, derivatives thereof, and more specifically, monomers having one polymerizable unsaturated bond ((meth) acryloyl group) of (meth) acrylic acid in the molecule. Can be mentioned.
  • an alkyl (meth) acrylate having 4 to 30 carbon atoms is preferably used, and an alkyl (meth) acrylate having 12 to 22 carbon atoms is used to improve the dispersibility of the quantum dots. From the viewpoint of, it is more preferable. As the dispersibility of the quantum dots improves, the amount of light that goes straight from the wavelength conversion layer to the exit surface increases, which is effective in improving front luminance and front contrast.
  • monofunctional (meth) acrylate monomers include butyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, oleyl (meth) acrylate, stearyl (meth) acrylate, and behenyl (meth) acrylate.
  • Butyl (meth) acrylamide, octyl (meth) acrylamide, lauryl (meth) acrylamide, oleyl (meth) acrylamide, stearyl (meth) acrylamide, behenyl (meth) acrylamide and the like are preferable.
  • lauryl (meth) acrylate, oleyl (meth) acrylate, and stearyl (meth) acrylate are particularly preferable.
  • the bifunctional (meth) acrylate monomers include neopentyl glycol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tripropylene glycol di (meth) ) Acrylate, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclo Pentenyloxyethyl (meth) acrylate, dicyclopentanyl di (meth) acrylate and the like are preferable examples.
  • the trifunctional or higher functional (meth) acrylate monomers include epichlorohydrin (ECH) modified glycerol tri (meth) acrylate, ethylene oxide (EO) modified glycerol tri (meta).
  • the quantum dot-containing polymerizable composition includes a (meth) acrylate monomer having a molecular weight Mw as a radical polymerizable compound and a ratio of the number F of (meth) acryloid groups per molecule, Mw / F is 200 or less. It is also preferable. Mw / F is more preferably 150 or less, and most preferably 100 or less.
  • the (meth) acrylate monomer having a small Mw / F can reduce the oxygen permeability of the wavelength conversion layer formed by curing the quantum dot-containing polymerizable composition, thereby improving the light resistance of the wavelength conversion member. Because it can.
  • a (meth) acrylate monomer having a small Mw / F is preferable in that the crosslink density of the polymer in the wavelength conversion layer can be increased and the breakage of the wavelength conversion layer can be prevented.
  • Specific examples of (meth) acrylate monomers having Mw / F of 200 or less include pentaerythritol triacrylate, pentaerythritol tetraacrylate, trimethylolpropane trimethacrylate, dipentaerythritol hexaacrylate, tricyclodecane dimethanol An acrylate etc. are mentioned.
  • the amount of the polyfunctional (meth) acrylate monomer used may be 5 parts by mass or more from the viewpoint of coating film strength with respect to 100 parts by mass of the total amount of the polymerizable compounds contained in the quantum dot-containing polymerizable composition.
  • it is preferably 95 parts by mass or less.
  • the radical polymerizable compound is preferably contained in an amount of 10 to 99.9 parts by mass, and 50 to 99.9 parts by mass with respect to 100 parts by mass of the total amount of the quantum dot-containing polymerizable composition. Is more preferable, and 92 to 99 parts by mass is particularly preferable.
  • the quantum dot containing polymeric composition may contain the polymerization initiator as needed.
  • a polymerization initiator it is preferable to use a suitable polymerization initiator according to the kind of the polymerizable compound contained in the quantum dot-containing polymerizable composition.
  • a known radical initiator may be included.
  • the polymerization initiator reference can be made, for example, to paragraph 0037 of JP2013-043382A.
  • the polymerization initiator is preferably 0.1 mol% or more, more preferably 0.5 to 2 mol% of the total mass of the polymerizable compound contained in the quantum dot-containing polymerizable composition.
  • the quantum dot polymerizable composition may contain a solvent as necessary.
  • the type and amount of the solvent used are not particularly limited.
  • one or a mixture of two or more organic solvents can be used as the solvent.
  • the barrier films 10 and 20 are films having a function of suppressing the permeation of moisture and / or oxygen, and in this embodiment, the barrier films 12 and 22 are provided on the supports 11 and 21 respectively. Yes. In such an embodiment, due to the presence of the support, the strength of the wavelength conversion member 1D is improved, and film formation can be easily performed.
  • the barrier films 10 and 20 in which the barrier layers 12 and 22 are supported by the supports 11 and 21 are provided on both main surfaces of the wavelength conversion layer 30 so that the barrier layers 12 and 22 are adjacent to each other.
  • the barrier layers 12 and 22 do not have to be supported by the supports 11 and 21, and when the supports 11 and 21 have sufficient barrier properties, they are supported.
  • the barrier layer may be formed only by the bodies 11 and 21.
  • the aspect in which two barrier films 10 and 20 are contained in the wavelength conversion member like this embodiment is preferable, the aspect in which only one may be contained may be sufficient.
  • the barrier film preferably has a total light transmittance of 80% or more in the visible light region, and more preferably 90% or more.
  • the visible light region refers to a wavelength region of 380 to 780 nm, and the total light transmittance indicates an average value of light transmittance over the visible light region.
  • the oxygen permeability of the barrier films 10 and 20 is preferably 1.00 cm 3 / (m 2 ⁇ day ⁇ atm) or less.
  • the oxygen permeability is a value measured using an oxygen gas permeability measuring device (manufactured by MOCON, OX-TRAN 2/20: trade name) under the conditions of a measurement temperature of 23 ° C. and a relative humidity of 90%. It is.
  • the oxygen permeability of the barrier films 10 and 20 is more preferably 0.10 cm 3 / (m 2 ⁇ day ⁇ atm) or less, and still more preferably 0.01 cm 3 / (m 2 ⁇ day ⁇ atm) or less. More preferably, it is 0.001 cm 3 / (m 2 ⁇ day ⁇ atm) or less.
  • the barrier films 10 and 20 have a function of blocking moisture (water vapor) in addition to a gas barrier function of blocking oxygen.
  • the moisture permeability (water vapor transmission rate) of the barrier films 10 and 20 is 0.10 g / (m 2 ⁇ day ⁇ atm) or less.
  • the moisture permeability of the barrier films 10 and 20 is preferably 0.01 g / (m 2 ⁇ day ⁇ atm) or less.
  • the “main surface” refers to the surface (front surface, back surface) of the wavelength conversion layer disposed on the viewing side or the backlight side when the wavelength conversion member is used. The same applies to the main surfaces of the other layers and members.
  • this wavelength conversion layer 30 it is preferable that the main surfaces of the front and back of the wavelength conversion layer 30 are supported by the support bodies 11 and 21 like this embodiment.
  • the average film thickness of the supports 11 and 21 is preferably 10 ⁇ m or more and 500 ⁇ m or less, more preferably 20 ⁇ m or more and 400 ⁇ m or less, and more preferably 30 ⁇ m or more and 300 ⁇ m or less from the viewpoint of impact resistance of the wavelength conversion member. It is preferable. In an aspect in which retroreflection of light is increased, such as when the concentration of the quantum dots 30A and 30B included in the wavelength conversion layer 30 is reduced, or when the thickness of the wavelength conversion layer 30 is reduced, absorption of light having a wavelength of 450 nm is performed. Since the rate is preferably lower, the average film thickness of the supports 11 and 21 is preferably 40 ⁇ m or less, and more preferably 25 ⁇ m or less from the viewpoint of suppressing a decrease in luminance.
  • the retroreflective member of the backlight unit is used to maintain the display color of the LCD. It is necessary to increase the number of times the excitation light passes through the wavelength conversion layer by providing means for increasing retroreflection of light, such as providing a plurality of prism sheets in 2B. Therefore, the support is preferably a transparent support that is transparent to visible light. Here, being transparent to visible light means that the light transmittance in the visible light region is 80% or more, preferably 85% or more.
  • the light transmittance used as a measure of transparency is measured by measuring the total light transmittance and the amount of scattered light using the method described in JIS-K7105, that is, using an integrating sphere type light transmittance measuring device. It can be calculated by subtracting the rate.
  • the supports 11 and 21 preferably have an in-plane retardation Re (589) at a wavelength of 589 nm of 1000 nm or less. More preferably, it is 500 nm or less, and further preferably 200 nm or less.
  • Re (589) of the support is in the above range because foreign matters and defects can be more easily found during inspection using a polarizing plate.
  • Re (589) is measured with KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments Co., Ltd.) by making light having a wavelength of 589 nm incident in the normal direction of the film.
  • the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like.
  • the supports 11 and 21 are preferably supports having a barrier property against oxygen and moisture.
  • Preferred examples of the support include a polyethylene terephthalate film, a film made of a polymer having a cyclic olefin structure, and a polystyrene film.
  • the supports 11 and 21 preferably include barrier layers 12 and 22 including at least one inorganic barrier layer 12b and 22b formed in contact with the surface on the wavelength conversion layer 30 side.
  • the barrier layers 12 and 22 may include at least one organic barrier layer 12a and 22a between the supports 11 and 21 and the inorganic barrier layers 12b and 22b.
  • the organic barrier layers 12 a and 22 a may be provided between the inorganic barrier layers 12 b and 22 b and the wavelength conversion layer 30. Constructing the barrier layer from a plurality of layers is preferable from the viewpoint of improving the weather resistance since the barrier property can be further enhanced.
  • the organic barrier layer is also preferably provided between the inorganic barrier layers 12 b and 22 b and the wavelength conversion layer 30. In this case, the organic barrier layer may be referred to as a barrier coating layer (overcoat layer).
  • the barrier layers 12 and 22 are formed by forming films on the surfaces of the supports 11 and 21 as supports. Therefore, the barrier films 10 and 20 are comprised by the support bodies 11 and 21 and the barrier layers 12 and 22 provided on it. In the case where the barrier layers 12 and 22 are provided, the support preferably has high heat resistance.
  • the layer in the barrier films 10 and 20 adjacent to the wavelength conversion layer 30 may be an inorganic barrier layer or an organic barrier layer, and is not particularly limited.
  • the barrier layers 12 and 22 are preferably composed of a plurality of layers, since the barrier property can be further enhanced. Therefore, the barrier layers 12 and 22 are preferable from the viewpoint of improving the weather resistance. Since the rate tends to decrease, it is preferable to design in consideration of good light transmittance and barrier properties.
  • the “inorganic layer” is a layer mainly composed of an inorganic material, and is preferably a layer formed only from an inorganic material.
  • the inorganic barrier layers 12b and 22b suitable for the barrier layers 12 and 22 are not particularly limited, and various inorganic compounds such as metals, inorganic oxides, nitrides, and oxynitrides can be used.
  • As an element constituting the inorganic material silicon, aluminum, magnesium, titanium, tin, indium and cerium are preferable, and one or more of these may be included.
  • the inorganic compound examples include silicon oxide, silicon oxynitride, aluminum oxide, magnesium oxide, titanium oxide, tin oxide, indium oxide alloy, silicon nitride, aluminum nitride, and titanium nitride.
  • a metal film such as an aluminum film, a silver film, a tin film, a chromium film, a nickel film, or a titanium film may be provided.
  • an inorganic barrier layer containing silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, or aluminum oxide is particularly preferable. Since the inorganic barrier layer made of these materials has good adhesion with the organic barrier layer, even when the inorganic barrier layer has pinholes, the organic barrier layer can effectively fill the pinholes, The barrier property can be further increased. Further, silicon nitride is most preferable from the viewpoint of suppressing light absorption in the barrier layer.
  • the method for forming the inorganic barrier layer is not particularly limited, and for example, various film forming methods capable of evaporating or scattering the film forming material and depositing on the deposition surface can be used.
  • Examples of the method for forming the inorganic barrier layer include: a vacuum vapor deposition method in which an inorganic material such as an inorganic oxide, an inorganic nitride, an inorganic oxynitride, or a metal is heated and vapor-deposited; Oxidation reaction vapor deposition method that oxidizes and deposits by introducing; sputtering method in which inorganic material is used as target raw material, argon gas and oxygen gas are introduced and sputtered by sputtering; generated in inorganic material by plasma gun
  • chemical vapor deposition methods Physical Vapor Deposition method, PVD method
  • ion plating which is heated by a plasma beam, and vapor deposition is performed
  • plasma chemistry using an organic silicon compound as a raw material Vapor phase growth (Chemical Vapor Deposition) And the like.
  • the thickness of the inorganic barrier layer may be 1 nm to 500 nm, preferably 5 nm to 300 nm, and more preferably 10 nm to 150 nm.
  • the film thickness of the adjacent inorganic barrier layer is within the above-mentioned range, it is possible to suppress light absorption in the inorganic barrier layer while realizing good barrier properties, and a wavelength conversion member with higher light transmittance. It is because it can provide.
  • the organic layer is a layer mainly composed of an organic material, and preferably refers to a layer in which the organic material occupies 50% by mass or more, more preferably 80% by mass or more, and particularly 90% by mass or more.
  • JP, 2007-290369, A paragraphs 0020-0042 and JP, 2005-096108, A paragraphs 0074-0105 can be referred to as an organic barrier layer.
  • the organic barrier layer preferably contains a cardo polymer. Thereby, the adhesion between the organic barrier layer and the adjacent layer, in particular, the adhesion with the inorganic barrier layer is improved, and a further excellent barrier property can be realized.
  • the film thickness of the organic barrier layer is preferably in the range of 0.05 ⁇ m to 10 ⁇ m, and more preferably in the range of 0.5 to 10 ⁇ m.
  • the film thickness of the organic barrier layer is preferably in the range of 0.5 to 10 ⁇ m, and more preferably in the range of 1 to 5 ⁇ m.
  • it is preferably in the range of 0.05 ⁇ m to 5 ⁇ m, and more preferably in the range of 0.05 ⁇ m to 1 ⁇ m. This is because when the film thickness of the organic barrier layer formed by the wet coating method or the dry coating method is within the above-described range, the adhesion with the inorganic layer can be further improved.
  • the wavelength conversion layer, the inorganic barrier layer, the organic barrier layer, and the support may be laminated in this order, between the inorganic barrier layer and the organic barrier layer, and between the two organic barrier layers.
  • the support may be laminated between the two inorganic barrier layers.
  • the barrier films 10 and 20 include an unevenness imparting layer (matte layer) that imparts an uneven structure on the surface opposite to the surface on the wavelength conversion layer 30 side. It is preferable that the barrier film has a matte layer because the blocking property and slipping property of the barrier film can be improved.
  • the mat layer is preferably a layer containing particles. Examples of the particles include inorganic particles such as silica, alumina, and metal oxide, or organic particles such as crosslinked polymer particles.
  • the mat layer is preferably provided on the surface of the barrier film opposite to the wavelength conversion layer, but may be provided on both surfaces.
  • a wavelength conversion member 1 ⁇ / b> D manufactured by a second manufacturing method described later includes an adhesive layer 50.
  • an adhesive layer 50 The layer formed by hardening
  • the adhesive is curable, various types of adhesives conventionally used in the production of polarizing plates can be used, but from the viewpoint of weather resistance, polymerizability, etc. It preferably contains an adhesive that cures.
  • cationically polymerizable compounds such as epoxy compounds, more specifically, epoxy having no aromatic ring in the molecule as described in JP-A-2004-245925
  • An active energy ray curable adhesive containing a compound as one of the active energy ray curable components is preferred.
  • active energy ray-curable adhesives usually generate polymerization species, especially cationic species or Lewis acids upon irradiation with active energy rays.
  • a cationic photopolymerization initiator for initiating polymerization of the active compound is blended.
  • a thermal cationic polymerization initiator that initiates polymerization by heating, and various other additives such as a photosensitizer may be blended.
  • the wavelength conversion member 1D can have a light scattering function in order to efficiently extract the fluorescence of the quantum dots to the outside.
  • the light scattering function may be provided inside the wavelength conversion layer 30, or a layer having a light scattering function may be separately provided as the light scattering layer.
  • the getter agent 40 functions as a scatterer in the wavelength conversion layer 30. Therefore, when it is necessary to enhance the light scattering function inside the wavelength conversion layer 30, new scattering particles may be added.
  • the mat layer it is preferable that the mat layer is a layer that can be used both as an unevenness providing layer and a light scattering layer.
  • the above-described wavelength conversion member in a mode in which the base materials 10 and 20 (hereinafter referred to as the barrier films 10 and 20) provided with the barrier layers 12 and 22 on the supports 11 and 21 are provided on both surfaces of the wavelength conversion layer 30.
  • the wavelength conversion layer 30 can be formed by applying the prepared quantum dot-containing polymerizable composition to the surface of the barrier films 10 and 20 and then curing it by light irradiation or heating.
  • Known coating methods include curtain coating, dip coating, spin coating, print coating, spray coating, slot coating, roll coating, slide coating, blade coating, gravure coating, and wire bar method. The coating method is mentioned.
  • Curing conditions can be appropriately set according to the type of polymerizable compound used and the composition of the polymerizable composition. Moreover, when a quantum dot containing polymeric composition is a composition containing a solvent, you may give a drying process for solvent removal before hardening.
  • the quantum dot-containing polymerizable composition may be cured in a state where the quantum dot-containing polymerizable composition is sandwiched between two supports.
  • the wavelength conversion member 1D of the present embodiment includes the first embodiment (FIG. 2A), the third embodiment (FIG. 3A) in which the getter agent 40 is uniformly dispersed, and the layer of the wavelength conversion layer 30.
  • the second embodiment (FIG. 2B) or the fourth embodiment (FIG. 3B) which is unevenly distributed in the boundary region (also referred to as being unevenly distributed on the outer surface), may be used.
  • the embodiment differs from the embodiment in the preparation of the quantum dot-containing polymerizable composition and the step of forming the wavelength conversion layer 30.
  • the wavelength conversion layer 30 is an aspect in which the getter agent 40 is uniformly dispersed in the layer, and the quantum dot-containing polymerizable material to which the getter agent 40 is added (dispersed).
  • the composition as a coating solution, a coating film can be easily formed by a normal coating method.
  • the getter agent 40 when preparing the coating liquid by mixing the materials contained in the quantum dot-containing polymerizable composition, the getter agent 40 is used to prevent the getter agent from aggregating. It is preferable to add and mix in the state of a getter agent dispersion.
  • the getter agent 40 is unevenly distributed in the layer boundary region (also referred to as being unevenly distributed on the outer surface).
  • the film forming method of the wavelength conversion layer having such a configuration is not particularly limited, but a quantum dot-containing polymerizable composition to which the getter agent 40 is added and a quantum dot-containing polymerizable composition to which no getter agent is added are co-cast.
  • a method of forming a multilayer film at the same time using a catalyst, and a method of sequentially forming a multilayer film by multi-step coating are examples.
  • a cured layer of a quantum dot-containing polymerizable composition to which a getter agent is added is disposed on the outermost surface side of the wavelength conversion layer, and a quantum dot without the addition of a getter layer is disposed on the inner surface side of the wavelength conversion layer.
  • the liquid to be used can be selected so that the cured layer of the containing polymerizable composition is disposed.
  • a coating solution used for manufacturing the wavelength conversion member of the second embodiment it is necessary to prepare a coating solution to which the getter agent 40 is added and a coating solution to which no getter agent is added.
  • FIG. 4 is a schematic configuration diagram of an example of a manufacturing apparatus of the wavelength conversion member 1D
  • FIG. 5 is a partially enlarged view of the manufacturing apparatus shown in FIG.
  • the manufacturing process of the wavelength conversion member using the manufacturing apparatus shown in FIGS. 4 and 5 includes a quantum dot-containing polymerizable composition on the surface of the first barrier film 10 (hereinafter referred to as “first film”) that is continuously conveyed.
  • a second barrier film 20 (hereinafter also referred to as “second film”) that is continuously conveyed is laminated (overlaid) on the coating film to form a coating film.
  • second film a second barrier film 20
  • first film or the second film it includes at least a step of wrapping around a backup roller and irradiating with light while being continuously conveyed to polymerize and cure the coating film to form a wavelength conversion layer (cured layer).
  • a barrier film having a barrier property against oxygen and moisture is used for both the first film and the second film.
  • wavelength conversion member 1D by which both surfaces of the wavelength conversion layer were protected by the barrier film can be obtained.
  • a wavelength conversion member having one surface protected by a barrier film may be used, and in that case, the barrier film side is preferably used as the side close to the outside air.
  • the first film 10 is continuously conveyed from the unillustrated transmitter to the coating unit 120.
  • the first film 10 is delivered from the delivery device at a conveyance speed of 1 to 50 m / min. However, it is not limited to this conveyance speed.
  • a tension of 20 to 150 N / m, preferably 30 to 100 N / m is applied to the first film 10.
  • the quantum dot containing polymeric composition (henceforth "application liquid” is also applied) is apply
  • a die coater 124 and a backup roller 126 disposed to face the die coater 124 are installed.
  • the surface of the first film 10 opposite to the surface on which the coating film 30M is formed is wound around the backup roller 126, and the coating liquid is applied from the discharge port of the die coater 124 to the surface of the first film 10 that is continuously conveyed. It is applied to form a coating film 30M.
  • the coating film 30 ⁇ / b> M refers to a quantum dot-containing polymerizable composition before being applied on the first film 10.
  • the die coater 124 to which the extrusion coating method is applied is shown as the coating apparatus, but the present invention is not limited to this.
  • a coating apparatus to which various methods such as a curtain coating method, an extrusion coating method, a rod coating method, or a roll coating method are applied can be used.
  • the first film 10 that has passed through the coating unit 120 and has the coating film 30M formed thereon is continuously conveyed to the laminating unit 130.
  • the second film 20 continuously conveyed is laminated on the coating film 30 ⁇ / b> M, and the coating film 30 ⁇ / b> M is sandwiched between the first film 10 and the second film 20.
  • a laminating roller 132 and a heating chamber 134 surrounding the laminating roller 132 are installed in the laminating unit 130.
  • the heating chamber 134 is provided with an opening 136 for allowing the first film 10 to pass therethrough and an opening 138 for allowing the second film 20 to pass therethrough.
  • a backup roller 162 is disposed at a position facing the laminating roller 132.
  • the first film 10 on which the coating film 30M is formed is wound around the backup roller 162 on the surface opposite to the surface on which the coating film 30M is formed, and is continuously conveyed to the laminating position P.
  • Lamination position P means the position where the contact between the second film 20 and the coating film 30M starts.
  • the first film 10 is preferably wound around the backup roller 162 before reaching the laminating position P. This is because even if wrinkles occur in the first film 10, the wrinkles are corrected and removed by the backup roller 162 before reaching the laminate position P.
  • the position (contact position) where the first film 10 is wound around the backup roller 162 and the distance L1 to the laminate position P are preferably long, for example, 30 mm or more is preferable, and the upper limit is usually It is determined by the diameter of the backup roller 162 and the pass line.
  • the second film 20 is laminated by the backup roller 162 and the laminating roller 132 used in the curing unit 160. That is, the backup roller 162 used in the curing unit 160 is also used as a roller used in the laminating unit 130.
  • the present invention is not limited to the above form, and a laminating roller may be installed in the laminating unit 130 in addition to the backup roller 162 so that the backup roller 162 is not used.
  • the backup roller 162 used in the curing unit 160 in the laminating unit 130, the number of rollers can be reduced.
  • the backup roller 162 can also be used as a heat roller for the first film 10.
  • the second film 20 sent from a sending machine (not shown) is wound around the laminating roller 132 and continuously conveyed between the laminating roller 132 and the backup roller 162.
  • the second film 20 is laminated on the coating film 30M formed on the first film 10 at the laminating position P. Thereby, the coating film 30 ⁇ / b> M is sandwiched between the first film 10 and the second film 20.
  • Lamination refers to laminating the second film 20 on the coating film 30M.
  • the distance L2 between the laminating roller 132 and the backup roller 162 is a value of the total thickness of the first film 10, the wavelength conversion layer (cured layer) 30 obtained by polymerizing and curing the coating film 30M, and the second film 20.
  • the above is preferable.
  • L2 is below the length which added 5 mm to the total thickness of the 1st film 10, the coating film 30M, and the 2nd film 20.
  • FIG. By making the distance L2 equal to or less than the total thickness plus 5 mm, it is possible to prevent bubbles from entering between the second film 20 and the coating film 30M.
  • the distance L2 between the laminating roller 132 and the backup roller 162 is the shortest distance between the outer circumferential surface of the laminating roller 132 and the outer circumferential surface of the backup roller 162.
  • Rotational accuracy of the laminating roller 132 and the backup roller 162 is 0.05 mm or less, preferably 0.01 mm or less in radial runout. The smaller the radial runout, the smaller the thickness distribution of the coating film 30M.
  • the difference between the temperature of the backup roller 162 of the curing unit 160 and the temperature of the first film 10 is preferably 30 ° C. or less, more preferably 15 ° C. or less, and most preferably the same.
  • the heating chamber 134 In order to reduce the difference from the temperature of the backup roller 162, when the heating chamber 134 is provided, it is preferable to heat the first film 10 and the second film 20 in the heating chamber 134.
  • hot air is supplied to the heating chamber 134 by a hot air generator (not shown), and the first film 10 and the second film 20 can be heated.
  • the first film 10 may be heated by the backup roller 162 by being wound around the temperature-adjusted backup roller 162.
  • the second film 20 can be heated with the laminating roller 132 by using the laminating roller 132 as a heat roller.
  • the heating chamber 134 and the heat roller are not essential, and can be provided as necessary.
  • the first film 10 and the second film 20 are continuously conveyed to the curing unit 160 in a state where the coating film 30M is sandwiched between the first film 10 and the second film 20.
  • curing in the curing unit 160 is performed by light irradiation.
  • the polymerizable compound contained in the quantum dot-containing polymerizable composition is polymerized by heating, such as spraying hot air Curing can be performed by heating.
  • a light irradiation device 164 is provided at a position facing the backup roller 162. Between the backup roller 162 and the light irradiation device 164, the first film 10 and the second film 20 sandwiching the coating film 30M are continuously conveyed. What is necessary is just to determine the light irradiated by a light irradiation apparatus according to the kind of photopolymerizable compound contained in a quantum dot containing polymeric composition, and an ultraviolet-ray is mentioned as an example.
  • the ultraviolet light means light having a wavelength of 280 to 400 nm.
  • a light source that generates ultraviolet rays for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
  • the light irradiation amount may be set within a range in which polymerization and curing of the coating film can proceed.
  • the coating film 30M can be irradiated with ultraviolet rays having an irradiation amount of 100 to 10,000 mJ / cm 2 .
  • the first film 10 is wound around the backup roller 162 in a state where the coating film 30 ⁇ / b> M is sandwiched between the first film 10 and the second film 20, and is continuously conveyed from the light irradiation device 164.
  • the wavelength conversion layer (cured layer) 30 can be formed by performing light irradiation to cure the coating film 30M.
  • the first film 10 side is wound around the backup roller 162 and continuously conveyed, but the second film 20 may be wound around the backup roller 162 and continuously conveyed.
  • Wrapping around the backup roller 162 means a state in which either the first film 10 or the second film 20 is in contact with the surface of the backup roller 162 at a certain wrap angle. Accordingly, the first film 10 and the second film 20 move in synchronization with the rotation of the backup roller 162 while being continuously conveyed.
  • the winding around the backup roller 162 may be at least during the irradiation of ultraviolet rays.
  • the backup roller 162 includes a cylindrical main body and rotating shafts disposed at both ends of the main body.
  • the main body of the backup roller 162 has a diameter of ⁇ 200 to 1000 mm, for example. There is no restriction on the diameter ⁇ of the backup roller 162. In consideration of curl deformation of the laminated film, equipment cost, and rotational accuracy, the diameter is preferably 300 to 500 mm.
  • the temperature of the backup roller 162 takes into consideration the heat generation during light irradiation, the curing efficiency of the coating film 30M, and the occurrence of wrinkle deformation on the backup roller 162 of the first film 10 and the second film 20. Can be determined.
  • the backup roller 162 is preferably set to a temperature range of 10 to 95 ° C., for example, and more preferably 15 to 85 ° C.
  • the temperature related to the roller refers to the surface temperature of the roller.
  • the distance L3 between the laminate position P and the light irradiation device 164 can be set to 30 mm or more, for example.
  • the coating film 30M becomes the cured layer 30 by light irradiation, and the wavelength conversion member 1D including the first film 10, the cured layer 30, and the second film 20 is manufactured.
  • the wavelength conversion member 1D is peeled off from the backup roller 162 by the peeling roller 180.
  • the wavelength conversion member 1D is continuously conveyed to a winder (not shown), and then the wavelength conversion member 1D is wound into a roll by the winder.
  • the manufacturing method of the wavelength conversion member 1D of the second embodiment is the same as the manufacturing method of the wavelength conversion member 1D of the first embodiment except that the film forming method of the coating film 30M of the wavelength conversion layer is different.
  • the coating film 30M is formed by coating the coating liquid to which the getter agent is added and the coating liquid without the addition of the getter agent in a co-casting or separate process. To do.
  • the coating unit 120 uses a co-casting die coater as the die coater 124, and the coating liquid is applied from the discharge port of the co-casting die coater 124 to the surface of the first film 10 that is continuously conveyed. Is applied, and a coating film 30M of a multilayer cast film comprising a coating film to which a getter agent is added and a coating film to which no getter agent is added is formed.
  • ⁇ Second production method> In the first method for producing a wavelength conversion member, after the coating film 30M is formed on the first film, the second film is laminated before the coating film 30M is cured, and the coating film 30M is formed into the first film. The coating film 30M is cured while being sandwiched between the second film and the second film.
  • the coating film 30M is cured as necessary after the drying treatment, and then the wavelength conversion layer ( A cured layer) and, if necessary, a coating layer on the wavelength conversion layer, a second film is laminated on the wavelength conversion layer via an adhesive (and a coating layer), and a wavelength conversion member 1D is formed.
  • the coating layer is one or more other layers such as an inorganic layer, and can be formed by a known method. As mentioned above, although 2 aspects of the manufacturing process of wavelength conversion member 1D were demonstrated, this invention is not limited to the said aspect.
  • the backlight unit 2 shown in FIG. 1 includes a light source 1A that emits primary light (blue light L B ), and a light guide plate 1B that guides and emits primary light emitted from the light source 1A.
  • a backlight unit that is a multi-wavelength light source.
  • blue light having an emission center wavelength in a wavelength band of 430 to 480 nm and a peak of emission intensity having a half width of 100 nm or less, and an emission center wavelength in a wavelength band of 500 to 600 nm and having a half width of It is preferable to emit green light having an emission intensity peak that is 100 nm or less and red light having an emission center wavelength in the wavelength band of 600 to 680 nm and having an emission intensity peak that is 100 nm or less.
  • the wavelength band of the blue light emitted from the backlight unit 2 is preferably 430 to 480 nm, and more preferably 440 to 460 nm.
  • the wavelength band of the green light emitted from the backlight unit 2 is preferably 520 to 560 nm, and more preferably 520 to 545 nm.
  • the wavelength band of red light emitted from the backlight unit is preferably 600 to 680 nm, and more preferably 610 to 640 nm.
  • the half-value widths of the emission intensity of blue light, green light, and red light emitted from the backlight unit are all preferably 80 nm or less, more preferably 50 nm or less, and 40 nm or less. More preferably, it is more preferably 30 nm or less. Among these, it is particularly preferable that the half-value width of each emission intensity of blue light is 25 nm or less.
  • the backlight unit 2 includes at least the planar light source 1C together with the wavelength conversion member 1D.
  • the light source 1A include those that emit blue light having an emission center wavelength in the wavelength band of 430 nm to 480 nm, and those that emit ultraviolet light.
  • a light emitting diode, a laser light source, or the like can be used as the light source 1A.
  • the planar light source 1 ⁇ / b> C may be a planar light source including a light source 1 ⁇ / b> A and a light guide plate 1 ⁇ / b> B that guides and emits primary light emitted from the light source 1 ⁇ / b> A.
  • a planar light source that is arranged in a plane parallel to the wavelength conversion member 1D and includes a diffusion plate instead of the light guide plate 1B may be used.
  • the former planar light source is generally called an edge light system, and the latter planar light source is generally called a direct type.
  • a case where a planar light source is used as the light source has been described as an example. However, a light source other than the planar light source can be used as the light source.
  • the reflecting plate 2A is not particularly limited, and known ones can be used, and are described in Japanese Patent No. 3416302, Japanese Patent No. 3363565, Japanese Patent No. 4091978, Japanese Patent No. 3448626, etc. Incorporated into the present invention.
  • the retroreflective member 2B may include a known diffusion plate, diffusion sheet, prism sheet (for example, BEF series manufactured by Sumitomo 3M Limited), a light guide, or the like.
  • the configuration of the retroreflective member 2B is described in Japanese Patent No. 3416302, Japanese Patent No. 3363565, Japanese Patent No. 4091978, Japanese Patent No. 3448626, and the contents of these publications are incorporated in the present invention.
  • the backlight unit 2 described above can be applied to a liquid crystal display device.
  • the liquid crystal display device 4 includes the backlight unit 2 of the above embodiment and the liquid crystal cell unit 3 disposed to face the retroreflective member side of the backlight unit.
  • the liquid crystal cell unit 3 has a configuration in which a liquid crystal cell 31 is sandwiched between polarizing plates 32 and 33.
  • the polarizing plates 32 and 33 have both main surfaces of polarizers 322 and 332, respectively.
  • the polarizing plate protective films 321 and 323, 331 and 333 are protected.
  • liquid crystal cell 31 there are no particular limitations on the liquid crystal cell 31, the polarizing plates 32 and 33, and the components thereof that constitute the liquid crystal display device 4, and those produced by known methods and commercially available products can be used without any limitation. It is of course possible to provide a known intermediate layer such as an adhesive layer between the layers.
  • the driving mode of the liquid crystal cell 31 is not particularly limited, and is twisted nematic (TN), super twisted nematic (STN), vertical alignment (VA), in-plane switching (IPS), optically compensated bend cell (OCB). ) And other modes can be used.
  • the liquid crystal cell is preferably VA mode, OCB mode, IPS mode, or TN mode, but is not limited thereto.
  • the configuration shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2008-262161 is given as an example.
  • the specific configuration of the liquid crystal display device is not particularly limited, and a known configuration can be adopted.
  • the liquid crystal display device 4 further includes an associated functional layer such as an optical compensation member that performs optical compensation as necessary, and an adhesive layer.
  • an associated functional layer such as an optical compensation member that performs optical compensation as necessary, and an adhesive layer.
  • an adhesive layer such as an adhesive to an adhesive layer.
  • a surface layer such as an undercoat layer may be disposed.
  • the backlight side polarizing plate 32 may have a retardation film as the polarizing plate protective film 323 on the liquid crystal cell 31 side.
  • a retardation film a known cellulose acylate film or the like can be used.
  • the backlight unit 2 and the liquid crystal display device 4 include the above-described wavelength conversion member with little optical loss according to the present invention. Therefore, the backlight unit and the liquid crystal display device having the same effects as those of the wavelength conversion member of the present invention, a high-brightness backlight unit and a liquid crystal display device in which the separation of the interface of the wavelength conversion layer including the quantum dots hardly occurs and the light emission intensity hardly decreases.
  • first barrier film (no coating layer) A first organic layer and an inorganic layer were sequentially formed on one side of a polyethylene terephthalate film (PET film, manufactured by Toyobo Co., Ltd., trade name: Cosmo Shine A4300, thickness 50 ⁇ m) by the following procedure.
  • PET film polyethylene terephthalate film
  • TMPTA trimethylolpropane triacrylate
  • a photopolymerization initiator Liberti, ESACURE KTO46
  • This coating solution was applied onto the PET film by a roll toe roll using a die coater, and passed through a drying zone at 50 ° C. for 3 minutes. Then, ultraviolet rays were irradiated in a nitrogen atmosphere (accumulated dose: about 600 mJ / cm 2 ), cured by UV curing, and wound up.
  • the thickness of the first organic layer formed on the support (the PET film) was 1 ⁇ m.
  • an inorganic barrier layer (silicon nitride layer) was formed on the surface of the first organic layer using a roll-to-roll CVD apparatus.
  • Silane gas flow rate 160 sccm
  • ammonia gas flow rate 370 sccm
  • hydrogen gas flow rate 590 sccm
  • nitrogen gas flow rate 240 sccm
  • a high frequency power supply having a frequency of 13.56 MHz was used as the power supply.
  • the film forming pressure was 40 Pa, and the reached film thickness was 50 nm.
  • the moisture permeability of this barrier film was 0.001 g / (m 2 ⁇ day ⁇ atm) under the condition of 40 ° C. and 90% RH.
  • a first barrier film 2 (used in Example 23) was produced in the same manner except that the ultimate film thickness was changed to 15 nm from the formation method of the barrier film 1.
  • the moisture permeability of this barrier film was 0.01 g / (m 2 ⁇ day ⁇ atm) under the condition of 40 ° C. and 90% RH.
  • a first barrier film 3 (used in Example 24) was produced in the same manner except that the ultimate film thickness was changed to 5 nm from the formation method of the barrier film 1.
  • the moisture permeability of this barrier film was 0.1 g / (m 2 ⁇ day ⁇ atm) under the condition of 40 ° C. and 90% RH.
  • a second organic layer (barrier coating layer) was formed on the surface of the inorganic layer of the first barrier film 1 by the following procedure.
  • a urethane skeleton acrylic polymer (Acrit 8BR500 manufactured by Taisei Fine Chemical Co., Ltd.) and a photopolymerization initiator (Irgacure 184 manufactured by Ciba Chemical Co., Ltd.) are weighed to a mass ratio of 95: 5, dissolved in methyl ethyl ketone, and a solid content concentration of 15 % Coating solution was prepared.
  • the coating solution was directly applied to the surface of the inorganic layer of the first barrier film 1 using a roll toe roll using a die coater, and passed through a drying zone at 100 ° C. for 3 minutes. Thereafter, while being held in a heat roll heated to 60 ° C., it was cured by irradiation with ultraviolet rays (integrated irradiation amount: about 600 mJ / cm 2 ) and wound up.
  • the thickness of the coating layer formed on the support was 1 ⁇ m. In this way, a second barrier film having a second organic layer (barrier coating layer) as a barrier coating layer was produced.
  • Quantum dot-containing polymerizable composition 1 was prepared with the following blending ratio.
  • the content of quantum dots in the toluene dispersion of quantum dots 1 and 2 is 1% by mass.
  • the cores of the quantum dots 1 and 2 used were CdSe and the shell was ZnS.
  • Quantum dot-containing polymerizable composition 2 having the same composition was prepared except that monomer 1 of quantum dot-containing polymerizable composition 1 was changed to monomer 2 (methyl methacrylate (MMA): manufactured by Mitsubishi Gas Chemical Company).
  • MMA methyl methacrylate
  • a quantum dot-containing polymerizable composition 3 having the same composition was prepared except that the monomer 1 of the quantum dot-containing polymerizable composition 1 was changed to the monomer 3 (trimethylpropane triacrylate (TMPTA): manufactured by Daicel Cytec).
  • TMPTA trimethylpropane triacrylate
  • the quantum dot containing polymeric composition 4 and 5 was prepared with the following compounding ratio.
  • INP530-25 manufactured by NN-Labs, which is a green quantum dot dispersion liquid with an emission wavelength of 530 nm, is used.
  • an NN that is a red quantum dot dispersion liquid with an emission wavelength of 620 nm is used.
  • -INP620-25 manufactured by Labs was used.
  • NP Labs' INP530-25 and INP620-25 are both quantum dots using InP as the core, ZnS as the shell, and oleylamine as the ligand, and are dispersed in toluene at a concentration of 3% by weight. It was.
  • Table 1 shows the layer structure, the composition of the quantum dot-containing composition in the wavelength conversion layer (matrix type, composition of the getter agent), the moisture permeability of the barrier film, and Examples 1 to 30 and Comparative Examples 1 to 20 of the present invention. It shows about an evaluation result.
  • the Greek numeral I means a structure manufactured by the second manufacturing method and having an adhesive layer
  • the Greek numeral III is manufactured by the first manufacturing method and does not have an adhesive layer.
  • arithmetic numbers 1 to 6 indicate the presence or absence of the used barrier film and the coating layer of the wavelength conversion layer. Details are as follows. 1: first barrier film / wavelength conversion layer / first barrier film 2: first barrier film / wavelength conversion layer / second barrier film 3: first barrier film / wavelength conversion layer / covering layer / first 1 barrier film 4: first barrier film / wavelength conversion layer / coating layer / second barrier film 5: second barrier film / wavelength conversion layer / coating layer (adhesive layer) / second barrier film 6: Second barrier film / wavelength conversion layer / second barrier film
  • the getter agent distribution item in the layer configuration item shows the distribution form of the getter agent in the wavelength conversion layer, and “dispersion” refers to the first embodiment (FIG. 2A) and the third embodiment (FIG. 3A). ), “Outer surface uneven distribution” means the second embodiment (FIG. 2B) and the fourth embodiment (FIG. 3B).
  • a getter agent is added to each of the above-described quantum dot-containing polymerizable compositions 1 to 5 so as to have the compositions shown in Tables 1 to 3, and used in each example.
  • a quantum dot-containing polymerizable composition was prepared.
  • the quantum dot-containing polymerizable composition of each example was prepared, filtered through a polypropylene filter having a pore size of 0.2 ⁇ m, and then dried under reduced pressure for 30 minutes to obtain a coating solution.
  • “% by mass” means 1% by mass relative to the total mass of the quantum dot-containing polymerizable composition after addition of the getter agent. The same applies to the following “mass%”.
  • zeolite used in Examples 33 to 38, Examples 41 to 43, and Examples 46 to 48 high silica zeolite HSZ-722HOA manufactured by Tosoh Corporation was used.
  • the average particle size of the used zeolite was 6 ⁇ m.
  • Method for Producing Wavelength Conversion Layer (First Production Method: III in Table 1, First Embodiment) Prepare the first barrier film used in each example, and apply the quantum dot-containing polymerizable composition of each example on the surface of the inorganic barrier layer with a die coater while continuously transporting at a tension of 1 m / min and 60 N / m. A coating film having a thickness of 50 ⁇ m was formed. Next, the first barrier film on which the coating film is formed is wound around a backup roller, and the barrier film of each example is laminated on the coating film so that the barrier layer surface is in contact with the coating film. Was wound around the backup roller and irradiated with ultraviolet rays while being continuously conveyed to obtain the wavelength conversion layer of the first embodiment.
  • Table 1 shows the ratio of the area occupied by the getter agent in each region divided into three equal parts in the thickness direction. Occupying area ratio observes the cross-section in the thickness direction of the wavelength conversion layer by a transmission electron microscope (manufactured by JEOL Ltd. JEM-2100), the occupied area ratio S B1, S B2, S C of the getter material particles occupying in the measurement area It was measured. In each region, the TEM spot size was 1 nm and the observation magnification was 30000 times. Three fields of view of approximately 4 ⁇ m ⁇ 3 ⁇ m were used.
  • First manufacturing method III in Table 1, second embodiment
  • the quantum dot-containing polymerizable composition to which the getter agent is added and the quantum dot-containing polymerizable compound to which the getter agent is not added are mixed with a co-casting die coater so that the getter agent-containing layer is the outermost surface.
  • the wavelength conversion layer of the second embodiment was obtained in the same manner as in the first production method, except that the multilayer coating film having a thickness of 50 ⁇ m was formed by simultaneous application.
  • Table 1 shows the ratio of the area occupied by the getter agent in each region divided into three equal parts in the thickness direction.
  • the diameter of the backup roller was ⁇ 300 mm, and the temperature of the backup roller was 50 ° C.
  • the irradiation amount of ultraviolet rays was 2000 mJ / cm 2 .
  • L1 was 50 mm, L2 was 1 mm, and L3 was 50 mm.
  • the coating film was cured by irradiation with ultraviolet rays to form a cured layer (wavelength conversion layer), and the wavelength conversion member of each example was manufactured.
  • the thickness of the cured layer in each example was 50 ⁇ 2 ⁇ m.
  • the thickness accuracy of the hardened layer was as good as ⁇ 4%.
  • production of wrinkles was not seen by the obtained wavelength conversion member.
  • the quantum dot-containing polymerizable composition of each example is applied on the inorganic barrier layer surface of the first barrier film used in each example by a die coater, and a coating film having a thickness of 50 ⁇ m is formed. Formed. Next, the first barrier film on which the coating film is formed is wound around a backup roller, and the coating film is cured by irradiating the coating film with ultraviolet rays at the same irradiation amount as in the first manufacturing method. Wavelength conversion layer) was formed.
  • the barrier film of each example in which an adhesive material was applied to the barrier layer surface was laminated so that the adhesive surface was in contact with the cured layer, and then wound around the backup roller with the coating film sandwiched between the barrier films, Curing was performed to manufacture the wavelength conversion member of each example.
  • the thickness and thickness accuracy of the cured layer in each example were the same as in the first manufacturing method, and no wrinkles were observed in the obtained wavelength conversion member.
  • a commercially available tablet terminal (manufactured by Amazon, Kindle Fire HDX 7 ") was disassembled and the backlight unit was taken out.
  • the wavelength conversion member of each example cut out in a rectangular shape was placed on the light guide plate of the taken out backlight unit, Two prism sheets with the direction of the surface unevenness pattern perpendicularly placed on top of each other.
  • the luminance of light emitted from the blue light source and transmitted through the wavelength conversion member and the two prism sheets is perpendicular to the surface of the light guide plate.
  • SR3 luminance meter
  • the wavelength conversion member of each example was placed on a commercially available blue light source (OPSM-H150X142B, manufactured by OPTEX-FA Corporation), and blue light was applied to the wavelength conversion member for 100 hours. Irradiated continuously.
  • the luminance (Y1) at the four corners of the wavelength conversion member after continuous irradiation was measured by the same method as the evaluation of luminance before continuous irradiation, and the rate of change ( ⁇ Y) from the luminance before continuous irradiation described in the following formula. It was taken as an index of luminance change.
  • ⁇ Y (Y0 ⁇ Y1) ⁇ Y0 ⁇ 100 Evaluation criteria ⁇ Y ⁇ 20: Excellent 20 ⁇ ⁇ Y ⁇ 30: Good 30 ⁇ Y: No Good

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Abstract

Cette invention concerne un élément de conversion de longueur d'onde présentant une couche de conversion de longueur d'onde comprenant des boîtes quantiques qui émettent une fluorescence lorsqu'elles sont irradiées d'une lumière d'excitation, dans lequel un délaminage ne se produit pas facilement à une interface de la couche de conversion de longueur d'onde comprenant les boîtes quantiques et par conséquent une réduction de l'intensité d'émission de lumière ne se produit pas facilement. L'invention concerne en outre une unité de rétro-éclairage à haute luminance et un appareil d'affichage à cristaux liquides dans lequel un délaminage ne se produit pas facilement à une interface d'une couche de conversion de longueur d'onde comprenant des boîtes quantiques et par conséquent une réduction de l'intensité d'émission de lumière ne se produit pas facilement. Un élément de conversion de longueur d'onde (1D) comprend : une couche de conversion de longueur d'onde (30) comprenant au moins un type de boîtes quantiques (30A, 30B) qui sont excitées par une lumière d'excitation afin d'émettre une fluorescence et comprenant en outre un sorbeur (40) qui capture au moins l'un d'entre l'humidité et l'oxygène ; et une couche barrière (12, 22) formée sur au moins une face de la couche de conversion de longueur d'onde (30) et présentant une perméabilité à l'humidité inférieure ou égale à 0,1 g/(m2·jour·atm). Ladite couche de conversion de longueur d'onde (30) est une couche formée par durcissement d'une composition polymérisable contenant les boîtes quantiques (30A, 30B) et le sorbeur (40).
PCT/JP2015/005685 2014-11-14 2015-11-13 Élément de conversion de longueur d'onde, unité de rétroéclairage le comprenant et appareil d'affichage à cristaux liquides WO2016075949A1 (fr)

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