WO2019186733A1 - Élément de conversion de longueur d'onde, unité de rétroéclairage, dispositif d'affichage d'image et composition durcissable - Google Patents

Élément de conversion de longueur d'onde, unité de rétroéclairage, dispositif d'affichage d'image et composition durcissable Download PDF

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Publication number
WO2019186733A1
WO2019186733A1 PCT/JP2018/012588 JP2018012588W WO2019186733A1 WO 2019186733 A1 WO2019186733 A1 WO 2019186733A1 JP 2018012588 W JP2018012588 W JP 2018012588W WO 2019186733 A1 WO2019186733 A1 WO 2019186733A1
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Prior art keywords
curable composition
wavelength conversion
conversion member
cured product
quantum dot
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PCT/JP2018/012588
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English (en)
Japanese (ja)
Inventor
達也 矢羽田
国廣 桐ケ谷
康平 向垣内
美香 柳田
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日立化成株式会社
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Application filed by 日立化成株式会社 filed Critical 日立化成株式会社
Priority to PCT/JP2018/012588 priority Critical patent/WO2019186733A1/fr
Priority to JP2019551712A priority patent/JP6702515B2/ja
Priority to PCT/JP2019/013419 priority patent/WO2019189498A1/fr
Publication of WO2019186733A1 publication Critical patent/WO2019186733A1/fr
Priority to JP2020080791A priority patent/JP2020170164A/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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, a backlight unit, an image display device, and a curable composition.
  • the wavelength conversion member including the quantum dot phosphor is disposed, for example, in the backlight unit of the image display device.
  • a wavelength conversion member including a quantum dot phosphor that emits red light and a quantum dot phosphor that emits green light when the wavelength conversion member is irradiated with blue light as excitation light, the quantum dot phosphor emits light.
  • White light can be obtained by the red light and green light that have been generated and the blue light that has passed through the wavelength conversion member.
  • the wavelength conversion member containing the quantum dot phosphor usually has a cured product obtained by curing a curable composition containing the quantum dot phosphor.
  • the curable composition includes a thermosetting type and a photocurable type, and a photocurable type curable composition is preferably used from the viewpoint of productivity.
  • the wavelength conversion member containing quantum dot fluorescent substance at least one part of the hardened
  • a barrier film having a barrier property against oxygen may be provided on one side or both sides of a cured product containing a quantum dot phosphor.
  • the quantum dot phosphor in the cured product is likely to deteriorate due to the influence of oxygen. Therefore, when the wavelength conversion member containing the quantum dot phosphor is left in a high-temperature and high-humidity environment, the quantum dot phosphor may deteriorate and the emission intensity may decrease.
  • a cured product of a photocurable curable composition containing a quantum dot phosphor has insufficient durability (moisture and heat resistance) in a high-temperature and high-humidity environment, and the quantum dot phosphor is deteriorated and has a light emission intensity. It tends to decrease.
  • the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a wavelength conversion member that includes a quantum dot phosphor and is excellent in moisture and heat resistance, a backlight unit using the same, and an image display device. Furthermore, this indication aims at providing the curable composition which can form the hardened
  • a wavelength conversion member comprising a cured product including a quantum dot phosphor and having an alkyleneoxy structure.
  • the quantum dot phosphor includes a compound containing at least one of Cd and In.
  • ⁇ 5> The polar component calculated from the formula of Wu using the contact angle of diiodomethane and the contact angle of water in the cured product is 5 mJ / m 2 to 12 mJ / m 2 , from ⁇ 1> to ⁇ 4>
  • ⁇ 7> The wavelength conversion member according to any one of ⁇ 1> to ⁇ 6>, wherein a glass transition temperature of the cured product measured by dynamic viscoelasticity measurement is 47 ° C. or lower.
  • a backlight unit comprising the wavelength conversion member according to any one of ⁇ 1> to ⁇ 7> and a light source.
  • An image display device comprising the backlight unit according to ⁇ 8>.
  • a curable composition comprising a quantum dot phosphor, an alkyleneoxy group-containing compound having an alkyleneoxy group and a polymerizable reactive group, and a photopolymerization initiator.
  • the curable composition according to ⁇ 10> further comprising a polyfunctional thiol compound.
  • the ratio of the number of thiol groups in the polyfunctional thiol compound to the number of polymerizable reactive groups in the alkyleneoxy group-containing compound is 0.5 to
  • ⁇ 15> The curable composition according to any one of ⁇ 10> to ⁇ 14>, wherein the polymerizable reactive group includes a (meth) acryloyl group.
  • the polymerizable reactive group includes a (meth) acryloyl group.
  • ⁇ 16> The curable composition according to any one of ⁇ 10> to ⁇ 15>, further comprising a carboxylic acid having 1 to 17 carbon atoms.
  • ⁇ 17> The curable composition according to any one of ⁇ 10> to ⁇ 16>, further comprising a white pigment.
  • a wavelength conversion member that includes a quantum dot phosphor and is excellent in moisture and heat resistance
  • a backlight unit and an image display device using the wavelength conversion member Furthermore, according to the present disclosure, it is possible to provide a curable composition capable of forming a cured product that includes a quantum dot phosphor and is excellent in moisture and heat resistance.
  • each component may contain a plurality of corresponding substances.
  • the content or content of each component is the total content or content of the multiple types of substances present in the composition unless otherwise specified.
  • a plurality of particles corresponding to each component may be included.
  • the particle diameter of each component means a value for a mixture of the plurality of particles present in the composition unless otherwise specified.
  • the term “layer” or “film” includes only a part of the region in addition to the case where the layer or film is formed over the entire region. The case where it is formed is also included.
  • laminate indicates that layers are stacked, and two or more layers may be combined, or two or more layers may be detachable.
  • (meth) acryloyl means at least one of acryloyl and methacryloyl
  • (meth) acrylate means at least one of acrylate and methacrylate
  • “(meth) allyl” means allyl and methallyl. Means at least one.
  • a compound containing both a thiol group and an alkyleneoxy group is classified as a thiol compound.
  • a structure in which an oxygen atom of an ester bond and a carbon atom adjacent to the oxygen atom are bonded (—O—R in —C ( ⁇ O) —O—R, R represents a substituent)
  • a structure in which an oxygen atom of a hydroxyl group and a carbon atom adjacent to the oxygen atom are bonded is not classified as an alkyleneoxy group.
  • the wavelength conversion member of the present disclosure includes a cured product including a quantum dot phosphor and having an alkyleneoxy structure.
  • the wavelength conversion member of the present disclosure may include other components such as a coating material to be described later as necessary.
  • the cured product of the present disclosure may be a cured product of the curable composition of the present disclosure described later.
  • the wavelength conversion member of the present disclosure is suitably used for image display.
  • the wavelength conversion member of the present disclosure has improved relative emission intensity retention, which is an indicator of deterioration of the quantum dot phosphor, even when exposed to a high temperature and high humidity environment because the cured product has an alkyleneoxy structure. And excellent in heat and humidity resistance. This is because polarity is imparted to the cured product by the alkyleneoxy structure, and nonpolar oxygen is difficult to dissolve in components (eg, resin components) in the cured product, so that it is difficult for oxygen to contact the quantum dot phosphor. Thus, the reason is that the oxidative deterioration of the quantum dots is suppressed.
  • the alkyleneoxy structure may be derived, for example, from an alkyleneoxy group in an alkyleneoxy group-containing compound contained in the curable composition described later.
  • the component in the cured product has an alkyleneoxy structure
  • the compatibility between the component in the cured product and the quantum dot phosphor is reduced, and the cured product is likely to become cloudy, thus providing a light scattering effect to the cured product. Tend to be.
  • the oxidative deterioration of the quantum dot phosphor is suitably suppressed, even if the content of the quantum dot phosphor in the cured product is reduced as compared with the conventional case, a good emission intensity is obtained. It tends to be obtained.
  • the cured product preferably has a sulfide structure.
  • the sulfide structure is, for example, a compound containing a thiol group in a polyfunctional thiol compound that can be included in the curable composition described later and a polymerizable reactive group such as a carbon-carbon double bond (for example, an alkyleneoxy group containing described later) It may be formed by a polymerization reaction with a polymerizable reactive group in the compound).
  • the cured product may have an alicyclic structure.
  • the alicyclic structure contained in the cured product is not particularly limited. Specific examples of the alicyclic structure include a tricyclodecane skeleton, a cyclohexane skeleton, a 1,3-adamantane skeleton, a hydrogenated bisphenol A skeleton, a hydrogenated bisphenol F skeleton, a hydrogenated bisphenol S skeleton, and an isobornyl skeleton. Among these, a tricyclodecane skeleton or an isobornyl skeleton is preferable, and a tricyclodecane skeleton is more preferable.
  • the alicyclic structure contained in the cured product may be one type alone or at least two types.
  • examples of combinations of alicyclic structures include a combination of a tricyclodecane skeleton and an isobornyl skeleton, a combination of a hydrogenated bisphenol A skeleton and an isobornyl skeleton, and the like.
  • a combination of a tricyclodecane skeleton and an isobornyl skeleton is preferable.
  • the cured product may have an ester structure.
  • the ester structure may be derived from, for example, an ester structure in an alkyleneoxy group-containing compound contained in the curable composition described later.
  • the wavelength conversion member of the present disclosure uses the contact angle of diiodomethane and the contact angle of water in the cured product, and the polar component calculated from the Wu equation is preferably 5 mJ / m 2 to 12 mJ / m 2 .
  • the polar component calculated from the Wu equation is preferably 5 mJ / m 2 to 12 mJ / m 2 .
  • Polar components described above, from the viewpoint of further excellent wet heat resistance is preferably 5.5mJ / m 2 ⁇ 11mJ / m 2, more preferably from 6.0mJ / m 2 ⁇ 10.5mJ / m 2 6.0 mJ / m 2 to 10 mJ / m 2 is more preferable.
  • the wavelength conversion member of the present disclosure preferably has a moisture permeability of 20 g / m 2 ⁇ day or more under the conditions of a temperature of 40 ° C. and a relative humidity of 70%. Since the moisture permeability mentioned above is a certain value or more, the cured product has high polarity, and non-polar oxygen is not easily dissolved in the components in the cured product. There is a tendency that oxidative deterioration of the quantum dot phosphor in the cured product is suitably suppressed.
  • a cured product having a moisture permeability of a certain value or more is likely to adsorb moisture, and by adsorbing moisture, the polarity of the cured product becomes higher, and nonpolar oxygen is less likely to be dissolved by components in the cured product. Therefore, it is presumed that the oxidative deterioration of the quantum dot phosphor is suitably suppressed.
  • the moisture permeability of the cured product under the conditions of a temperature of 40 ° C. and a relative humidity of 70% can be measured according to the measurement method of JIS Z 0208: 1976 as described in the examples described later.
  • the above-mentioned moisture permeability is more preferably 30 g / m 2 ⁇ day or more, further preferably 40 g / m 2 ⁇ day or more, more preferably 50 g / m 2 ⁇ day or more, from the viewpoint that the decrease in emission intensity is more suitably suppressed.
  • m is 2 ⁇ day or more, and still more preferably 60 g / m 2 ⁇ day or more.
  • the moisture permeability is preferably 250 g / m 2 ⁇ day or less, more preferably 210 g / m 2 ⁇ day or less, from the viewpoint of suppressing an increase in oxygen permeability due to a decrease in cohesive strength of the cured product. More preferably, it is more preferably 180 g / m 2 ⁇ day or less, and particularly preferably 150 g / m 2 ⁇ day or less.
  • a ratio (V1 /) of a peak area (V1) attributed to C C stretching vibration and a peak area (V2) attributed to SH stretching vibration in a cured product.
  • V2) is preferably 0.00052 or less, more preferably 0.0001 or less, and further preferably 0.00009 or less.
  • the ratio (V1 / V2) may be 0.00001 or more, 0.00003 or more, or 0.00004 or more.
  • the glass transition temperature of the cured product tends to decrease, so the oxygen permeability tends to increase due to the reduced cohesive strength of the cured product. It tends to be excellent in workability.
  • the background measurement is performed with air, and FT-IR measurement is performed under the condition of 16 integrations.
  • the wavelength conversion member has a coating material
  • the cured product of the wavelength conversion member in a state where the coating material is peeled is subjected to FT-IR measurement.
  • the cured product may contain a white pigment.
  • the details of the white pigment contained in the cured product are as described in the section of the curable composition described later.
  • the details of the quantum dot phosphor contained in the cured product are also as described in the section of the curable composition described later.
  • the shape of the wavelength conversion member is not particularly limited, and examples thereof include a film shape and a lens shape.
  • the wavelength conversion member is preferably a film.
  • the average thickness of the cured product is, for example, preferably 50 ⁇ m to 200 ⁇ m, more preferably 50 ⁇ m to 150 ⁇ m, and even more preferably 80 ⁇ m to 120 ⁇ m.
  • the average thickness is 50 ⁇ m or more, the wavelength conversion efficiency tends to be further improved, and when the average thickness is 200 ⁇ m or less, the backlight unit tends to be thinner when applied to the backlight unit described later. is there.
  • the average thickness of the film-like cured product is, for example, as an arithmetic average value of thicknesses measured at arbitrary three locations using a micrometer or by observing a cross section of the cured product using an SEM (scanning electron microscope). Desired.
  • the average thickness (for example, average thickness of coating
  • the average thickness of the wavelength conversion member other than the cured product may be subtracted from the average thickness of the wavelength conversion member.
  • cured material uses a reflection spectral film thickness meter etc., or hardened
  • the wavelength conversion member may be one obtained by curing one type of curable composition, or may be one obtained by curing two or more types of curable compositions.
  • the wavelength conversion member when the wavelength conversion member is in the form of a film, the wavelength conversion member emits light from the first cured product obtained by curing the curable composition containing the first quantum dot phosphor and the first quantum dot phosphor.
  • a laminate of a second cured product obtained by curing a curable composition containing second quantum dot phosphors having different characteristics may be used.
  • the wavelength conversion member can be obtained by irradiating an active energy ray such as an ultraviolet ray after forming a coating film, a molded product or the like of the curable composition and performing a drying treatment as necessary.
  • the wavelength and irradiation amount of the active energy ray can be appropriately set according to the composition of the curable composition. In one aspect, it is irradiated with ultraviolet rays having a wavelength of 280 nm ⁇ 400 nm at an irradiation amount of 100mJ / cm 2 ⁇ 5000mJ / cm 2.
  • Examples of the ultraviolet light source include 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, a chemical lamp, a black light lamp, and a microwave-excited mercury lamp.
  • the cured product preferably has a glass transition temperature (Tg) of 47 ° C. or lower, more preferably 0 ° C. to 47 ° C., and more preferably 10 ° C. to 47 ° C. from the viewpoint of further improving adhesion and workability. More preferably, the temperature is 15 ° C. to 21 ° C.
  • the glass transition temperature (Tg) of the cured product can be measured using a dynamic viscoelasticity measuring device (for example, Rheometric Scientific, Solid Analyzer RSA-III) under the condition of a frequency of 10 Hz.
  • the cured product preferably has a storage elastic modulus of 1 ⁇ 10 3 Pa to 1 ⁇ 10 10 Pa measured under conditions of a frequency of 10 Hz and a temperature of 25 ° C. from the viewpoint of improving adhesion and heat resistance. More preferably, it is from x10 4 Pa to 1 x 10 9 Pa, and even more preferably from 1 x 10 5 Pa to 1 x 10 7 Pa.
  • the storage elastic modulus of the cured product can be measured using a dynamic viscoelasticity measuring device (for example, Rheometric Scientific, Solid Analyzer RSA-III).
  • the wavelength conversion member of the present disclosure may further include a covering material that covers at least a part of the cured product.
  • a covering material that covers at least a part of the cured product.
  • the cured product is in the form of a film
  • one side or both sides of the film-like cured product may be covered with a film-shaped coating material.
  • the coating material has a barrier property against oxygen from the viewpoint of suppressing a decrease in light emission efficiency of the quantum dot phosphor.
  • the wavelength conversion member of the present disclosure is considered that the cured product has high polarity and nonpolar oxygen is hardly dissolved in a component (for example, a resin component) in the cured product, an inorganic layer described later is provided.
  • coated material with a barrier property with respect to oxygen lower than the barrier film to have may be sufficient.
  • the material of the coating material is not particularly limited.
  • resin is mentioned.
  • the type of resin is not particularly limited, polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin such as polyethylene (PE) and polypropylene (PP), polyamide such as nylon, and ethylene-vinyl alcohol copolymer (EVOH) and the like.
  • the covering material may be one (barrier film) provided with a barrier layer for enhancing the barrier function.
  • the barrier layer include inorganic layers containing inorganic substances such as alumina and silica.
  • the covering material may be a single layer structure or a multilayer structure. In the case of a multilayer structure, a combination of two or more layers having different materials may be used.
  • the average thickness of the coating material is, for example, preferably 80 ⁇ m to 150 ⁇ m, more preferably 100 ⁇ m to 140 ⁇ m, and even more preferably 100 ⁇ m to 135 ⁇ m.
  • the average thickness is 80 ⁇ m or more, functions such as barrier properties tend to be sufficient, and when the average thickness is 150 ⁇ m or less, a decrease in light transmittance tends to be suppressed.
  • the average thickness of the film-shaped coating material is obtained in the same manner as the average thickness of the film-shaped wavelength conversion member.
  • the coating material preferably contains EVOH.
  • the coating material containing EVOH tends to be inferior to the water barrier property than the barrier film composed of the resin base material and the inorganic layer, but suppresses deterioration of the quantum dot phosphor because the oxygen permeability is particularly low among the resins. It has a sufficient oxygen barrier property.
  • the proportion of ethylene-derived structural units (ethylene content) in EVOH is not particularly limited, and can be selected in consideration of the desired characteristics of the wavelength conversion member. From the viewpoint of oxygen barrier properties, the ethylene content is preferably small, and from the viewpoint of strength and water resistance, the ethylene content is preferably large.
  • the ethylene content in EVOH is preferably 20 mol% to 50 mol%, more preferably 25 mol% to 45 mol%, and even more preferably 30 mol% to 40 mol%.
  • the average thickness of the covering material containing EVOH is, for example, preferably 20 ⁇ m or more, and more preferably 50 ⁇ m or more. When the average thickness is 20 ⁇ m or more, functions such as barrier properties tend to be sufficient.
  • the average thickness of the covering material containing EVOH is, for example, preferably 150 ⁇ m or less, and more preferably 125 ⁇ m or less. When the average thickness is 150 ⁇ m or less, a decrease in light transmittance tends to be suppressed.
  • the oxygen permeability of the covering material is, for example, preferably 0.5 cm 3 / (m 2 ⁇ day ⁇ atm) or less, and more preferably 0.3 cm 3 / (m 2 ⁇ day ⁇ atm) or less. More preferably, it is 0.1 cm 3 / (m 2 ⁇ day ⁇ atm) or less.
  • the oxygen permeability of the coating material can be measured under the conditions of 20 ° C. and 65% relative humidity using an oxygen permeability measuring device (for example, MOCON, OX-TRAN).
  • an oxygen permeability measuring device for example, MOCON, OX-TRAN.
  • the upper limit value of the water vapor transmission rate of the coating material is not particularly limited, but may be, for example, 1 ⁇ 10 ⁇ 1 g / (m 2 ⁇ day) or less.
  • the water vapor transmission rate of the coating material can be measured in an environment of 40 ° C. and 90% relative humidity using a water vapor transmission rate measuring device (for example, MOCON, AQUATRAN).
  • a water vapor transmission rate measuring device for example, MOCON, AQUATRAN.
  • the wavelength conversion member of the present disclosure has a total light transmittance of preferably 55% or more, more preferably 60% or more, and more preferably 65% or more from the viewpoint of further improving the light utilization efficiency. Further preferred.
  • the total light transmittance of the wavelength conversion member can be measured in accordance with the measurement method of JIS K 7136: 2000.
  • the haze is preferably 95% or more, more preferably 97% or more, and further preferably 99% or more.
  • the haze of the wavelength conversion member can be measured in accordance with the measurement method of JIS K 7136: 2000.
  • the wavelength conversion member of the present disclosure is not limited to the configuration of FIG.
  • covering material is notional, and the relative relationship of a magnitude
  • symbol is attached
  • the 1 includes a cured product 11 that is a film-like cured product, and film-shaped coating materials 12A and 12B that are provided on both surfaces of the cured product 11.
  • the types and average thicknesses of the covering material 12A and the covering material 12B may be the same or different.
  • 1 can be manufactured by, for example, the following known manufacturing method.
  • a coating composition is formed by applying a curable composition described later to the surface of a film-like coating material (hereinafter also referred to as “first coating material”) that is continuously conveyed.
  • a method for applying the curable composition is not particularly limited, and examples thereof include a die coating method, a curtain coating method, an extrusion coating method, a rod coating method, and a roll coating method.
  • second coating material a film-like coating material that is continuously conveyed is bonded onto the coating film of the curable composition.
  • the coating film is cured to form a cured product.
  • the wavelength conversion member of the structure shown in FIG. 1 can be obtained by cutting out to a regular size.
  • the coating material is irradiated with active energy rays before the second coating material is bonded, and the cured product is removed. It may be formed.
  • the backlight unit of the present disclosure includes the above-described wavelength conversion member of the present disclosure and a light source.
  • the backlight unit is preferably a multi-wavelength light source from the viewpoint of improving color reproducibility.
  • blue light having an emission center wavelength in a wavelength range of 430 nm to 480 nm, an emission intensity peak having a half width of 100 nm or less, and an emission center wavelength in a wavelength range of 520 nm to 560 nm
  • the half-value width of the emission intensity peak means a peak width at half the peak height and a full width at half maximum (Full Width at Half Maximum, FWHM).
  • the emission center wavelength of the blue light emitted from the backlight unit is preferably in the range of 440 nm to 475 nm.
  • the emission center wavelength of the green light emitted from the backlight unit is preferably in the range of 520 nm to 545 nm.
  • the emission center wavelength of red light emitted from the backlight unit is preferably in the range of 610 nm to 640 nm.
  • the half-value widths of the emission intensity peaks of blue light, green light, and red light emitted by the backlight unit are all preferably 80 nm or less, and 50 nm or less. More preferably, it is more preferably 40 nm or less, particularly preferably 30 nm or less, and extremely preferably 25 nm or less.
  • the light source of the backlight unit for example, a light source that emits blue light having an emission center wavelength in a wavelength region of 430 nm to 480 nm can be used.
  • the light source include an LED (Light Emitting Diode) and a laser.
  • the wavelength conversion member preferably includes at least a quantum dot phosphor R that emits red light and a quantum dot phosphor G that emits green light. Thereby, white light can be obtained from the red light and green light emitted from the wavelength conversion member and the blue light transmitted through the wavelength conversion member.
  • the light source of the backlight unit for example, a light source that emits ultraviolet light having an emission center wavelength in a wavelength region of 300 nm to 430 nm can be used.
  • the light source include an LED and a laser.
  • the wavelength conversion member preferably includes a quantum dot phosphor B that emits blue light when excited by excitation light, together with the quantum dot phosphor R and the quantum dot phosphor G. Thereby, white light can be obtained from the red light, the green light, and the blue light emitted from the wavelength conversion member.
  • the backlight unit of the present disclosure may be an edge light type or a direct type.
  • FIG. 2 An example of a schematic configuration of an edge light type backlight unit is shown in FIG.
  • the backlight unit of the present disclosure is not limited to the configuration of FIG.
  • size of the member in FIG. 2 is notional, The relative relationship of the magnitude
  • the backlight unit 20 shown in FIG. 2 includes a light source 21 for emitting the blue light L B, a light guide plate 22 to be emitted guiding the blue light L B emitted from the light source 21, the light guide plate 22 and disposed to face A wavelength conversion member 10, a retroreflective member 23 disposed opposite to the light guide plate 22 via the wavelength conversion member 10, and a reflection plate 24 disposed opposite to the wavelength conversion member 10 via the light guide plate 22.
  • Wavelength conversion member 10 emits the red light L R and the green light L G part of the blue light L B as the excitation light, the red light L and R and the green light L G, the blue light was not the excitation light L B is emitted.
  • the red light L R, the green light L G, and the blue light L B, the white light L W is emitted from the retroreflective member 23.
  • An image display device includes the above-described backlight unit according to the present disclosure.
  • the image display device is not particularly limited, and examples thereof include a liquid crystal display device.
  • FIG. 3 An example of a schematic configuration of the liquid crystal display device is shown in FIG.
  • the liquid crystal display device of the present disclosure is not limited to the configuration of FIG.
  • size of the member in FIG. 3 is notional, The relative relationship of the magnitude
  • the liquid crystal display device 30 shown in FIG. 3 includes a backlight unit 20 and a liquid crystal cell unit 31 disposed to face the backlight unit 20.
  • the liquid crystal cell unit 31 is configured such that the liquid crystal cell 32 is disposed between the polarizing plate 33A and the polarizing plate 33B.
  • the driving method of the liquid crystal cell 32 is not particularly limited, and is a TN (Twisted Nematic) method, a STN (Super Twisted Nematic) method, a VA (Virtual Alignment) method, an IPS (In-Plane-Switching) method, and an OCB (Optically Filled). The method etc. are mentioned.
  • the curable composition of the present disclosure includes a quantum dot phosphor, an alkyleneoxy group-containing compound having an alkyleneoxy group and a polymerizable reactive group (also simply referred to as “alkyleneoxy group-containing compound” in this disclosure), and photopolymerization initiation. Contains agents.
  • the curable composition of this indication is excellent in the moist heat resistance of hardened
  • the curable composition includes a quantum dot phosphor.
  • the quantum dot phosphor is not particularly limited, and examples thereof include particles containing at least one selected from the group consisting of II-VI group compounds, III-V group compounds, IV-VI group compounds, and IV group compounds. From the viewpoint of luminous efficiency, the quantum dot phosphor preferably contains a compound containing at least one of Cd and In.
  • II-VI group compounds include CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeS, HgSeT, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, GdHgSe, ST Specific examples of the III-V group compounds include GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, In
  • IV-VI group compounds include SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, Sn, etc. .
  • group IV compound include Si
  • Quantum dot phosphors preferably have a core-shell structure.
  • the quantum efficiency of the quantum dot phosphor can be further improved.
  • core / shell examples include CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS, CdTe / ZnS, and the like.
  • the quantum dot phosphor may have a so-called core multishell structure in which the shell has a multilayer structure.
  • the quantum efficiency of the quantum dot phosphor can be further improved. Is possible.
  • the curable composition may contain one kind of quantum dot phosphor alone, or may contain two or more kinds of quantum dot phosphors in combination.
  • an aspect including a combination of two or more types of quantum dot phosphors for example, an aspect including two or more types of quantum dot phosphors having the same average particle diameter, although the components are different, and a quantum having the same components having different average particle diameters
  • the aspect containing 2 or more types of dot fluorescent substance and the aspect containing 2 or more types of quantum dot fluorescent substance from which a component and an average particle diameter differ are mentioned.
  • the curable composition comprises a quantum dot phosphor G having an emission center wavelength in the green wavelength region of 520 nm to 560 nm and a quantum dot phosphor R having an emission center wavelength in the red wavelength region of 600 nm to 680 nm. May be included.
  • the quantum dot phosphor G and the quantum dot phosphor R Respectively emit green light and red light.
  • white light can be obtained by the green light and red light emitted from the quantum dot phosphor G and the quantum dot phosphor R and the blue light transmitted through the cured product.
  • the quantum dot phosphor may be used in the state of a quantum dot phosphor dispersion liquid dispersed in a dispersion medium.
  • the dispersion medium for dispersing the quantum dot phosphor include water, various organic solvents, and a monofunctional (meth) acrylate compound.
  • the organic solvent that can be used as the dispersion medium include acetone, ethyl acetate, toluene, n-hexane, and the like.
  • the monofunctional (meth) acrylate compound that can be used as the dispersion medium is not particularly limited as long as it is liquid at room temperature (25 ° C.), and examples thereof include isobornyl (meth) acrylate and dicyclopentanyl (meth) acrylate. Can be mentioned.
  • the dispersion medium is preferably a monofunctional (meth) acrylate compound and has an alicyclic structure from the viewpoint that the step of volatilizing the dispersion medium when curing the curable composition is unnecessary.
  • a monofunctional (meth) acrylate compound is more preferable, isobornyl (meth) acrylate and dicyclopentanyl (meth) acrylate are more preferable, and isobornyl (meth) acrylate is particularly preferable.
  • the mass-based content ratio of the monofunctional (meth) acrylate compound and the alkyleneoxy group-containing compound is 0.01 to 0.30 is preferable, 0.02 to 0.20 is more preferable, and 0.05 to 0.20 is still more preferable.
  • the proportion of the quantum dot phosphor based on the mass of the quantum dot phosphor dispersion is preferably 1% by mass to 10% by mass, more preferably 1% by mass to 5% by mass, and more preferably 2% by mass to More preferably, it is 4.9% by mass.
  • the content of the quantum dot phosphor dispersion in the curable composition is such that the proportion of the quantum dot phosphor based on the mass of the quantum dot phosphor dispersion is 1% by mass to 10% by mass. For example, it is preferably 0.5% by mass to 8% by mass, more preferably 0.8% by mass to 5% by mass, and 1.0% by mass to 4.9% by mass with respect to the total amount of More preferably. Further, the content of the quantum dot phosphor in the curable composition is preferably, for example, 0.05% by mass to 0.8% by mass with respect to the total amount of the curable composition, and 0.08% by mass % To 0.5% by mass is more preferable, and 0.1% to 0.49% by mass is even more preferable.
  • the content of the quantum dot phosphor is 0.05% by mass or more, a sufficient emission intensity tends to be obtained when the cured product is irradiated with excitation light, and the content of the quantum dot phosphor is 0.8.
  • the content is less than or equal to mass%, aggregation of the quantum dot phosphor tends to be suppressed.
  • the curable composition of the present disclosure includes an alkyleneoxy group-containing compound having an alkyleneoxy group and a polymerizable reactive group.
  • the alkyleneoxy group-containing compound preferably has two or more polymerizable reactive groups, and more preferably has two polymerizable reactive groups.
  • the polymerizable reactive group include a functional group having an ethylenic double bond, and more specifically, a (meth) acryloyl group.
  • alkyleneoxy group for example, an alkyleneoxy group having 2 to 4 carbon atoms is preferable, an alkyleneoxy group having 2 or 3 carbon atoms is more preferable, and an alkyleneoxy group having 2 carbon atoms is more preferable.
  • the alkyleneoxy group-containing compound may have one type of alkyleneoxy group or may have two or more types of alkyleneoxy groups.
  • the alkyleneoxy group-containing compound may be a polyalkyleneoxy group-containing compound having a polyalkyleneoxy group containing a plurality of alkyleneoxy groups.
  • the alkyleneoxy group-containing compound preferably has 2 to 30 alkyleneoxy groups, more preferably 2 to 20 alkyleneoxy groups, and more preferably 3 to 10 alkyleneoxy groups. Is more preferable, and it is particularly preferable to have 3 to 5 alkyleneoxy groups.
  • the alkyleneoxy group-containing compound preferably has a bisphenol structure. Thereby, it exists in the tendency which is more excellent in heat-and-moisture resistance.
  • the bisphenol structure include a bisphenol A structure and a bisphenol F structure, and among them, the bisphenol A structure is preferable.
  • alkyleneoxy group-containing compound examples include alkoxyalkyl (meth) acrylates such as butoxyethyl (meth) acrylate; diethylene glycol monoethyl ether (meth) acrylate, triethylene glycol monobutyl ether (meth) acrylate, tetraethylene glycol monomethyl ether (Meth) acrylate, hexaethylene glycol monomethyl ether (meth) acrylate, octaethylene glycol monomethyl ether (meth) acrylate, nonaethylene glycol monomethyl ether (meth) acrylate, dipropylene glycol monomethyl ether (meth) acrylate, heptapropylene glycol monomethyl ether (Meth) acrylate, tetraethylene glycol monoethyl acetate
  • Poly (alkylene glycol) monoalkyl ether (meth) acrylates such as ru (meth) acrylate; Polyalkylene glycol monoaryl ether (me
  • alkyleneoxy group-containing compounds ethoxylated bisphenol A di (meth) acrylate, propoxylated bisphenol A di (meth) acrylate and propoxylated ethoxylated bisphenol A di (meth) acrylate are preferred, and ethoxylated bisphenol A di ( More preferred is (meth) acrylate.
  • the alkyleneoxy group-containing compound one type may be used alone, or two or more types may be used in combination.
  • the content of the alkyleneoxy group-containing compound in the curable composition is preferably, for example, 30% by mass to 70% by mass, and preferably 35% by mass to 65% by mass with respect to the total amount of the curable composition. It is preferably 40% by mass to 60% by mass.
  • the content of the alkyleneoxy group-containing compound is 30% by mass or more, moisture permeability tends to be suppressed from being excessively high.
  • the content of the alkyleneoxy group-containing compound is 70% by mass or less, curability is obtained. There exists a tendency which can suppress the fall of the water vapor transmission rate of a composition.
  • the curable composition of the present disclosure preferably includes a polyfunctional thiol compound.
  • the curable composition contains a polyfunctional thiol compound
  • the enethiol reaction proceeds between the alkyleneoxy group-containing compound and the polyfunctional thiol compound when the curable composition is cured, and the heat resistance of the cured product is increased. It tends to improve.
  • polyfunctional thiol compound examples include ethylene glycol bis (3-mercaptopropionate), diethylene glycol bis (3-mercaptopropionate), tetraethylene glycol bis (3-mercaptopropionate), 1,2- Propylene glycol bis (3-mercaptopropionate), diethylene glycol bis (3-mercaptobutyrate), 1,4-butanediol bis (3-mercaptopropionate), 1,4-butanediol bis (3-mercaptobutyrate) Rate), 1,8-octanediol bis (3-mercaptopropionate), 1,8-octanediol bis (3-mercaptobutyrate), hexanediol bisthioglycolate, trimethylolpropane tris (3-mercaptopropiate) Onee ), Trimethylolpropane tris (3-mercaptobutyrate), trimethylolpropane tris (3-mercaptoisobutyrate), trimethylol
  • the curable composition of the present disclosure may contain a monofunctional thiol compound having one thiol group in one molecule.
  • monofunctional thiol compounds include hexanethiol, 1-heptanethiol, 1-octanethiol, 1-nonanethiol, 1-decanethiol, 3-mercaptopropionic acid, methyl mercaptopropionate, methoxybutyl mercaptopropionate, Examples include octyl mercaptopropionate, tridecyl mercaptopropionate, 2-ethylhexyl-3-mercaptopropionate, n-octyl-3-mercaptopropionate, and the like.
  • the content of the thiol compound in the curable composition is:
  • the content is preferably 15% by mass to 70% by mass, more preferably 20% by mass to 65% by mass, and more preferably 25% by mass to 60% by mass with respect to the total amount of the curable composition. More preferably, the content is 30% by mass to 50% by mass. It exists in the tendency which can suppress the fall of the water vapor transmission rate of a curable composition because the content rate of a thiol compound is 15 mass% or more.
  • the content of the thiol compound is 70% by mass or less, the moisture permeability tends to be suppressed from becoming too high.
  • the proportion of the polyfunctional thiol compound based on the mass of the polyfunctional thiol compound and the monofunctional thiol compound used as necessary is preferably 60% by mass to 100% by mass, and more preferably 70% by mass to 100% by mass. More preferably, it is more preferably 80% by mass to 100% by mass.
  • Ratio of the number of thiol groups in the thiol compound (the sum of the polyfunctional thiol compound and the monofunctional thiol compound used as necessary, preferably the polyfunctional thiol compound) to the number of polymerizable reactive groups in the alkyleneoxy group-containing compound (Number of thiol groups / number of polymerizable reactive groups) is preferably 0.5 to 5.0, more preferably 0.8 to 4.0, and 1.0 to 3.5. More preferably, it is particularly preferably 1.2 to 3.0.
  • the curable composition of the present disclosure includes a photopolymerization initiator.
  • the photopolymerization initiator is not particularly limited, and specific examples include compounds that generate radicals upon irradiation with active energy rays such as ultraviolet rays.
  • the photopolymerization initiator include benzophenone, N, N′-tetraalkyl-4,4′-diaminobenzophenone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propanone-1,4,4′-bis (dimethylamino) benzophenone (also referred to as “Michler ketone”), 4,4′-bis (Diethylamino) benzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 1-hydroxycyclohexyl phenyl ketone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- (4- (2-hydroxyethoxy) -phenyl) -2-hydroxy-2-methyl-1-propane-1 Aromatic ketone compounds such as ON and 2-hydroxy-2-methyl
  • the photopolymerization initiator is preferably at least one selected from the group consisting of an acylphosphine oxide compound, an aromatic ketone compound, and an oxime ester compound from the viewpoint of curability, and includes an acylphosphine oxide compound and an aromatic ketone compound. More preferably, at least one selected from the group consisting of acylphosphine oxide compounds is more preferable.
  • the content of the photopolymerization initiator in the curable composition is preferably, for example, 0.1% by mass to 5% by mass, and preferably 0.1% by mass to 3% by mass with respect to the total amount of the curable composition. %, More preferably 0.3% by mass to 1.5% by mass.
  • the content of the photopolymerization initiator is 0.1% by mass or more, the sensitivity of the curable composition tends to be sufficient, and when the content of the photopolymerization initiator is 5% by mass or less, There exists a tendency for the influence on the hue of a curable composition and the fall of storage stability to be suppressed.
  • the curable composition of the present disclosure may include a liquid medium.
  • a liquid medium means a medium in a liquid state at room temperature (25 ° C.).
  • liquid medium examples include acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isopropyl ketone, methyl-n-butyl ketone, methyl isobutyl ketone, methyl-n-pentyl ketone, methyl-n-hexyl ketone, diethyl ketone, Ketone solvents such as dipropyl ketone, diisobutyl ketone, trimethylnonanone, cyclohexanone, cyclopentanone, methylcyclohexanone, 2,4-pentanedione, acetonylacetone; diethyl ether, methyl ethyl ether, methyl-n-propyl ether, diisopropyl Ether, tetrahydrofuran, methyltetrahydrofuran, dioxane, dimethyldioxane, ethylene glycol dimethyl ether
  • Glycol monoether solvents such as Terpene solvents such as terpinene, terpineol, myrcene, alloocimene, limonene, dipentene, pinene, carvone, oximene, and ferrandylene; straight silicone oils such as dimethyl silicone oil, methylphenyl silicone oil, and methylhydrogen silicone oil Amino-modified silicone oil, epoxy-modified silicone oil, cal Xyoxy-modified silicone oil, carbinol-modified silicone oil, mercapto-modified silicone oil, heterogeneous functional group-modified silicone oil, polyether-modified silicone oil, methylstyryl-modified silicone oil, hydrophilic specially-modified silicone oil, higher alkoxy-modified silicone oil, higher fatty acid Modified silicone oil such as modified silicone oil and fluorine-modified silicone oil; butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, oct
  • the content of the liquid medium in the curable composition is preferably, for example, 1% by mass to 10% by mass with respect to the total amount of the curable composition.
  • the content is more preferably 10% by mass to 10% by mass, and further preferably 4% by mass to 7% by mass.
  • the curable composition of the present disclosure may contain a carboxylic acid having 1 to 17 carbon atoms (hereinafter also referred to as “specific carboxylic acid”).
  • the specific carboxylic acid is a carboxylic acid having 2 to 12 carbon atoms from the viewpoint of being hard to be stained on the surface of the cured product, excellent in reliability of the cured product, and having less steric hindrance and being easily coordinated to the quantum dot phosphor.
  • the carboxylic acid having 2 to 10 carbon atoms is more preferable, the carboxylic acid having 3 to 8 carbon atoms is more preferable, the carboxylic acid having 3 to 6 carbon atoms is particularly preferable, and the carboxylic acid having 3 to 5 carbon atoms is more preferable. Acid is even more preferred.
  • carbon of a carboxy group shall be included in the carbon number in specific carboxylic acid.
  • the specific carboxylic acid may be an unsaturated carboxylic acid or a saturated carboxylic acid.
  • the carbon-carbon double bond in the unsaturated carboxylic acid reacts with the thiol group in the polyfunctional thiol compound, so that the specific carboxylic acid is less likely to be stained on the surface of the cured product, and from the viewpoint of excellent reliability of the cured product.
  • Unsaturated carboxylic acid is preferable, and methacrylic acid, acrylic acid and the like are more preferable.
  • the specific carboxylic acid may be a carboxylic acid having one or more carboxy groups, or a carboxylic acid having two or more carboxy groups.
  • the specific carboxylic acid may have a substituent.
  • substituents include a thiol group, amino group, hydroxy group, alkoxy group, acyl group, sulfonic acid group, aryl group, halogen atom, methacryl group and acrylic group.
  • the number of carbon atoms in the specific carboxylic acid does not include carbon in the substituent.
  • carboxylic acid examples include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, caproic acid, 2-ethylbutyric acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, Lauric acid, mytilic acid, palmitic acid, margaric acid, methacrylic acid, acrylic acid, fumaric acid, maleic acid, mercaptoacetic acid, mercaptopropionic acid, mercaptobutyric acid, mercaptovaleric acid, lactic acid, malic acid, citric acid, benzoic acid, phenyl Examples include acetic acid, phenylpropionic acid, phthalic acid, isophthalic acid, terephthalic acid, salicylic acid, and ⁇ -aminocaproic acid.
  • the specific carboxylic acid preferably includes at least one selected from the group consisting of acetic acid, mercaptopropionic acid, and methacrylic acid.
  • the specific carboxylic acid one type may be used alone, or two or more types may be used in combination.
  • the content ratio (specific carboxylic acid / quantum dot phosphor) of the specific carboxylic acid with respect to the quantum dot phosphor on the mass basis determines the reliability of the cured product and the quantum dot fluorescence. From the viewpoint of coordination to the body, it is preferably 0.06 to 6.2, more preferably 0.08 to 5.5, and still more preferably 0.09 to 5.3. .
  • the curable composition of the present disclosure may or may not contain a carboxylic acid having 18 or more carbon atoms such as oleic acid.
  • the curable composition of the present disclosure may contain a white pigment.
  • the white pigment include titanium oxide, barium sulfate, zinc oxide, calcium carbonate and the like. Among these, titanium oxide is preferable from the viewpoint of light scattering efficiency.
  • the curable composition contains titanium oxide as a white pigment, the titanium oxide may be rutile titanium oxide or anatase titanium oxide, and is preferably rutile titanium oxide.
  • the average particle diameter of the white pigment is preferably 0.1 ⁇ m to 1 ⁇ m, more preferably 0.2 ⁇ m to 0.8 ⁇ m, and further preferably 0.2 ⁇ m to 0.5 ⁇ m.
  • the average particle size of the white pigment can be measured as follows.
  • the white pigment extracted from the curable composition is dispersed in purified water containing a surfactant to obtain a dispersion.
  • a laser diffraction particle size distribution measuring apparatus for example, Shimadzu Corporation, SALD-3000J
  • the median diameter (D50) is defined as the average particle diameter of the white pigment.
  • the curable composition can be obtained by diluting the curable composition with a liquid medium, precipitating the white pigment by a centrifugal treatment or the like, and collecting the white pigment.
  • the average particle diameter of the white pigment contained in the cured product is calculated by calculating the equivalent circle diameter (the geometric average of the major axis and the minor axis) for 50 particles by observing the particles using a scanning electron microscope. It can be obtained as an arithmetic average value.
  • the white particles preferably have an organic layer containing an organic substance on at least a part of the surface from the viewpoint of suppressing aggregation of the white pigment in the curable composition.
  • Organic substances contained in the organic layer include organic silane, organosiloxane, fluorosilane, organic phosphonate, organic phosphoric acid compound, organic phosphinate, organic sulfonic acid compound, carboxylic acid, carboxylic acid ester, carboxylic acid derivative, amide, hydrocarbon Examples thereof include waxes, polyolefins, polyolefin copolymers, polyols, polyol derivatives, alkanolamines, alkanolamine derivatives, and organic dispersants.
  • the organic material contained in the organic material layer preferably contains a polyol, an organic silane, or the like, and more preferably contains at least one of a polyol or an organic silane.
  • the organic silane include octyltriethoxysilane, nonyltriethoxysilane, decyltriethoxysilane, dodecyltriethoxysilane, tridecyltriethoxysilane, tetradecyltriethoxysilane, pentadecyltriethoxysilane, hexadecyltriethoxy Silane, heptadecyltriethoxysilane, octadecyltriethoxysilane, etc.
  • organosiloxanes include polydimethylsiloxane terminated with a trimethylsilyl functional group (PDMS), polymethylhydrosiloxane (PMHS), polysiloxane derived by functionalization of PMHS with an olefin (by hydrosilylation), and the like. It is done.
  • organic phosphonate include, for example, n-octyl phosphonic acid and its ester, n-decyl phosphonic acid and its ester, 2-ethylhexyl phosphonic acid and its ester, and camphyl phosphonic acid and its ester.
  • organic phosphate compound examples include organic acidic phosphates, organic pyrophosphates, organic polyphosphates, organic metaphosphates, salts thereof, and the like.
  • organic phosphinate examples include n-hexylphosphinic acid and its ester, n-octylphosphinic acid and its ester, di-n-hexylphosphinic acid and its ester, and di-n-octylphosphinic acid and its ester. Can be mentioned.
  • organic sulfonic acid compound examples include hexyl sulfonic acid, octyl sulfonic acid, alkyl sulfonic acid such as 2-ethylhexyl sulfonic acid, these alkyl sulfonic acids and metal ions such as sodium, calcium, magnesium, aluminum and titanium, ammonium And salts with organic ammonium ions such as ions and triethanolamine.
  • carboxylic acid include maleic acid, malonic acid, fumaric acid, benzoic acid, phthalic acid, stearic acid, oleic acid, linoleic acid and the like.
  • carboxylic acid ester examples include the above carboxylic acid and ethylene glycol, propylene glycol, trimethylolpropane, diethanolamine, triethanolamine, glycerol, hexanetriol, erythritol, mannitol, sorbitol, pentaerythritol, bisphenol A, hydroquinone, furoquinone, Examples thereof include esters and partial esters formed by reaction with hydroxy compounds such as loglucinol.
  • Specific examples of the amide include stearic acid amide, oleic acid amide, erucic acid amide and the like.
  • polyolefin and its copolymer examples include a copolymer of polyethylene, polypropylene, ethylene and one or more compounds selected from propylene, butylene, vinyl acetate, acrylate, acrylamide, and the like.
  • polyol examples include glycerol, trimethylol ethane, trimethylol propane and the like.
  • alkanolamine examples include diethanolamine and triethanolamine.
  • organic dispersants include citric acid, polyacrylic acid, polymethacrylic acid, high molecular organic dispersants having functional groups such as anionic, cationic, zwitterionic, and nonionic.
  • the white pigment may have a metal oxide layer containing a metal oxide on at least a part of the surface.
  • the metal oxide contained in the metal oxide layer include silicon dioxide, aluminum oxide, zirconia, phosphoria, and boria.
  • the metal oxide layer may be a single layer or two or more layers.
  • the white pigment preferably includes a first metal oxide layer containing silicon dioxide and a second metal oxide layer containing aluminum oxide.
  • the white pigment has a metal oxide layer, the dispersibility of the white pigment in a cured product containing an alicyclic structure and a sulfide structure tends to be improved.
  • the white pigment may have an organic layer and a metal oxide layer.
  • the metal oxide layer and the organic material layer are provided in the order of the metal oxide layer and the organic material layer on the surface of the white pigment.
  • the surface of the white pigment has a first metal oxide layer containing silicon dioxide, a second metal oxide layer containing aluminum oxide, and an organic material. It is preferable that a layer is provided in order of a 1st metal oxide layer, a 2nd metal oxide layer, and an organic substance layer.
  • the content of the white pigment in the curable composition is, for example, 0.05% by mass to 1.0% by mass with respect to the total amount of the curable composition. It is preferably 0.1% by mass to 1.0% by mass, and more preferably 0.2% by mass to 0.5% by mass.
  • the curable composition may further contain other components such as a polymerization inhibitor, a silane coupling agent, a surfactant, an adhesion imparting agent, and an antioxidant.
  • the curable composition may contain one kind of each of other components, or may contain two or more kinds in combination.
  • the curable composition may contain the (meth) allyl compound as needed.
  • the curable composition may be prepared by, for example, a quantum dot phosphor, an alkyleneoxy group-containing compound having an alkyleneoxy group and a polymerizable reactive group, a polyfunctional thiol compound, a photopolymerization initiator, and, if necessary, the above-described components according to a conventional method. It can be prepared by mixing.
  • the quantum dot phosphor is preferably mixed while being dispersed in a dispersion medium.
  • the curable composition can be suitably used for film formation. Moreover, a curable composition can be used conveniently for formation of a wavelength conversion member.
  • Examples 1 to 4 and Comparative Examples 1 and 2 (Preparation of curable composition)
  • the curable compositions of Examples 1 to 5 and Comparative Examples 1 and 2 were prepared by mixing the components shown in Table 1 in the blending amounts (unit: parts by mass) shown in the same table. "-" In Table 1 means not blended.
  • Tricyclodecane dimethanol diacrylate (Shin Nakamura Chemical Co., Ltd., A-DCP) was used as the polyfunctional (meth) acrylate compound (comparative compound) having an alicyclic structure, and as an alkyleneoxy group-containing compound. Used ethoxylated bisphenol A diacrylate (Shin Nakamura Chemical Co., Ltd., ABE-300).
  • pentaerythritol tetrakis (3-mercaptopropionate) (SC Organic Chemical Co., PEMP) was used as the polyfunctional thiol compound.
  • PEMP pentaerythritol tetrakis (3-mercaptopropionate)
  • BASF 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide
  • a CdSe / ZnS (core / shell) dispersion Nanosys, Gen 3.5 QD Concentrate
  • Isobornyl acrylate was used as a dispersion medium for this CdSe / ZnS (core / shell) dispersion. 90% by mass or more of isobornyl acrylate is contained in the CdSe / ZnS (core / shell) dispersion. Acetic acid was used as the carboxylic acid.
  • titanium oxide (Chemours, Taipure R-706, particle size 0.36 ⁇ m) was used as a white pigment. On the surface of titanium oxide, a first metal oxide layer containing silicon oxide, a second metal oxide layer containing aluminum oxide, and an organic material layer containing a polyol compound are formed into a first metal oxide layer and a second metal oxide layer. And an organic material layer.
  • Each wavelength conversion member obtained above was cut into a 17 mm diameter to prepare a sample for evaluation.
  • the initial emission intensity of the sample for evaluation was measured with a fiber multichannel spectrometer (Ocean Photonics Co., Ltd., Ocean View).
  • the sample for evaluation was put into a constant temperature and humidity chamber under an environment of 85 ° C. and 95% RH (relative humidity) and allowed to stand for 1000 hours, and then the emission intensity was measured.
  • the relative light emission intensity retention rate of the wavelength conversion member was calculated according to the following formula. Relative emission intensity retention rate: (RLb / RLa) ⁇ 100 RLa:
  • Initial relative light emission intensity RLb Relative light emission intensity after 1000 hours in an environment of 85 ° C. and 95% RH Note that the higher the value of the relative light emission intensity retention rate, the better the wavelength conversion member is in heat and moisture resistance.
  • the storage elastic modulus (E ′) and loss elastic modulus (E ′′) of the cured product for evaluation were measured under the condition of “temperature rate: 10 ° C./min”, and the loss tangent (tan ⁇ ) was obtained from the ratio, and the loss tangent
  • the glass transition temperature (Tg) was determined from the temperature at the peak top portion of (tan ⁇ ).
  • V2 Peak area of a peak attributed to SH stretching vibration (peak wavelength: 2570 cm ⁇ 1 )

Abstract

L'invention concerne un élément de conversion de longueur d'onde qui est pourvu d'un produit durci qui contient un luminophore à points quantiques, tout en ayant une structure alkylèneoxy.
PCT/JP2018/012588 2018-03-27 2018-03-27 Élément de conversion de longueur d'onde, unité de rétroéclairage, dispositif d'affichage d'image et composition durcissable WO2019186733A1 (fr)

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JP2019551712A JP6702515B2 (ja) 2018-03-27 2019-03-27 波長変換部材、バックライトユニット、画像表示装置及び硬化性組成物
PCT/JP2019/013419 WO2019189498A1 (fr) 2018-03-27 2019-03-27 Élément de conversion de longueur d'onde, unité de rétroéclairage, dispositif d'affichage d'image et composition durcissable
JP2020080791A JP2020170164A (ja) 2018-03-27 2020-04-30 波長変換部材、バックライトユニット、画像表示装置及び硬化性組成物

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