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US-12624279-B2 - Quantum dot-containing polymerizable composition, cured product, wavelength conversion member, backlight unit, and liquid crystal display device

US12624279B2US 12624279 B2US12624279 B2US 12624279B2US-12624279-B2

Abstract

Provided is a polymerizable composition including a quantum dot, a polyfunctional thiol, a polyfunctional (meth)acrylate, and a phenolic compound.

Inventors

  • Natsuru CHIKUSHI
  • Tatsuya Oba
  • Hirofumi Toyama

Assignees

  • FUJIFILM CORPORATION

Dates

Publication Date
20260512
Application Date
20221027
Priority Date
20200428

Claims (15)

  1. 1 . A polymerizable composition comprising: a quantum dot; a polyfunctional thiol; a polyfunctional (meth)acrylate; and a phenolic compound represented by Formula 1, in Formula 1, among R 1 to R 5 , one represents a hydroxy group and the others independently represent a hydrogen atom or a substituent other than a hydroxy group, or two represent hydroxy groups and the others independently represent a hydrogen atom or a substituent other than a hydroxy group; wherein the hydroxy group is a group represented by —OH; wherein the substituent other than the hydroxy group is a linear or branched alkyl groups having 1 to 6 carbon atoms, or a carboxy group which may be substituted with a linear or branched alkyl groups having 1 to 6 carbon atoms; and wherein the number of the substituent other than a hydroxy group contained in one molecule of the phenolic compound is zero or one.
  2. 2 . The polymerizable composition according to claim 1 , wherein the number of hydroxy groups contained in one molecule of the phenolic compound is 2.
  3. 3 . The polymerizable composition according to claim 1 , wherein the number of hydroxy groups contained in one molecule of the phenolic compound is 3.
  4. 4 . The polymerizable composition according to claim 1 , wherein the polymerizable composition contains pyrogallol as the phenolic compound.
  5. 5 . The polymerizable composition according to claim 4 , wherein a content of pyrogallol with respect to a total amount of the composition is 0.001% by mass or more and 0.500% by mass or less.
  6. 6 . The polymerizable composition according to claim 4 , wherein a content of pyrogallol with respect to a total amount of the composition is 0.005% by mass or more and 0.300% by mass or less.
  7. 7 . The polymerizable composition according to claim 4 , wherein a content of pyrogallol with respect to a total amount of the composition is 0.010% by mass or more and 0.100% by mass or less.
  8. 8 . A cured product obtained by curing the polymerizable composition according to claim 1 .
  9. 9 . The cured product according to claim 8 , wherein the polymerizable composition contains pyrogallol as the phenolic compound.
  10. 10 . The cured product according to claim 9 , wherein a content of pyrogallol in the polymerizable composition with respect to a total amount of the composition is 0.001% by mass or more and 0.500% by mass or less.
  11. 11 . The cured product according to claim 9 , wherein a content of pyrogallol in the polymerizable composition with respect to a total amount of the composition is 0.005% by mass or more and 0.300% by mass or less.
  12. 12 . The cured product according to claim 9 , wherein a content of pyrogallol in the polymerizable composition with respect to a total amount of the composition is 0.010% by mass or more and 0.100% by mass or less.
  13. 13 . A wavelength conversion member comprising: the cured product according to claim 8 .
  14. 14 . A backlight unit comprising: the wavelength conversion member according to claim 13 ; and a light source.
  15. 15 . A liquid crystal display device comprising: the backlight unit according to claim 14 ; and a liquid crystal cell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation of PCT International Application No. PCT/JP2021/016874 filed on Apr. 28, 2021, which was published under PCT Article 21(2) in Japanese, and which claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2020-079834 filed on Apr. 28, 2020. The above applications are hereby expressly incorporated by reference, in their entirety, into the present application. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quantum dot-containing polymerizable composition, a cured product, a wavelength conversion member, a backlight unit, and a liquid crystal display device. 2. Description of the Related Art A flat panel display such as a liquid crystal display device (hereinafter, also referred to as LCD) is used as a space-saving image display apparatus with low power consumption, and its application is expanding year by year. The liquid crystal display device is usually composed of at least a backlight unit and a liquid crystal cell. In recent years, a quantum dot (also referred to as QD) has been attracting attention as a light emitting material for flat panel displays (see, for example, paragraph [0002] of JP5801886B). SUMMARY OF THE INVENTION The backlight unit can include a member containing at least quantum dots and a light source. Such a member is generally called a wavelength conversion member. For example, in a case where light is incident on a wavelength conversion member from a light source, quantum dots are excited by the incident light to emit fluorescence. Here, in a case of using quantum dots having different light-emitting properties, the fluorescence emitted by the quantum dots and/or each bright line light of red light, green light, and blue light as the light emitted from the light source and passed through the wavelength conversion member can be emitted from the wavelength conversion member. This makes it possible to realize white light. Since the fluorescence emitted by the quantum dots has a small half-width, the obtained white light has high brightness and excellent color reproducibility. With the progress of the three-wavelength light source technology using such quantum dots, the color reproduction range has been expanded from 72% to 100% compared to the current TV standards (Full High Definition (FHD), National Television System Committee (NTSC)). A member containing such quantum dots is desired to be capable of emitting light with higher brightness. The member can have a layer (generally referred to as a “wavelength conversion layer”) containing a cured product obtained by curing a polymerizable composition containing quantum dots. The polymerizable composition used for producing such a cured product is desired to have little change in viscosity over time, that is, to have excellent liquid stability. In view of the above, an object of one aspect of the present invention is to provide a quantum dot-containing polymerizable composition which can contribute to an improvement in brightness of a wavelength conversion member containing quantum dots and has excellent liquid stability. One aspect of the present invention relates to a polymerizable composition comprising a quantum dot, a polyfunctional thiol, a polyfunctional (meth)acrylate, and a phenolic compound. In one form, the number of hydroxy groups contained in one molecule of the phenolic compound can be in a range of 1 to 3. In one form, the number of hydroxy groups contained in one molecule of the phenolic compound can be 2 or 3. In one form, the number of hydroxy groups contained in one molecule of the phenolic compound can be 3. In one form, the polymerizable composition can contain pyrogallol as the phenolic compound. In one form, in the polymerizable composition, a content of pyrogallol with respect to a total amount of the composition can be 0.001% by mass or more and 0.500% by mass or less. In one form, in the polymerizable composition, a content of pyrogallol with respect to a total amount of the composition can be 0.005% by mass or more and 0.300% by mass or less. In one form, in the polymerizable composition, a content of pyrogallol with respect to a total amount of the composition can be 0.010% by mass or more and 0.100% by mass or less. One aspect of the present invention relates to a cured product obtained by curing the above-mentioned polymerizable composition. One aspect of the present invention relates to a wavelength conversion member comprising the cured product. One aspect of the present invention relates to a backlight unit comprising the wavelength conversion member and a light source. One aspect of the present invention relates to a liquid crystal display device comprising the backlight unit and a liquid crystal cell. According to one aspect of the present invention, it is possible to provide a polymerizable composition containing quantum dots, which enables the production of a wavelength conv