Wavelength conversion member, backlight unit, image display device and curable composition

Patent metadata

Field	Value
Publication number	US-2021040383-A1
Application number	US-201917041450-A
Country	US
Kind code	A1
Filing date	Mar 27, 2019
Priority date	Mar 27, 2018
Publication date	Feb 11, 2021
Grant date	—

Abstract

A wavelength conversion member which contains a cured product of a curable composition that contains a quantum dot phosphor and a carboxylic acid having 1 to 17 carbon atoms.

First claim

1 . A wavelength conversion member comprising a cured product of a curable composition which contains a quantum dot phosphor and a carboxylic acid having 1 to 17 carbon atoms.

2 . The wavelength conversion member according to claim 1 ,
wherein the cured product has an alicyclic structure in the skeleton of the cured product.

3 . The wavelength conversion member according to claim 2 ,
wherein the alicyclic structure comprises an isobornyl skeleton.

4 . The wavelength conversion member according to claim 2 ,
wherein the alicyclic structure comprises a tricyclodecane skeleton.

5 . The wavelength conversion member according to claim 1 ,
wherein the cured product comprises a white pigment.

6 . The wavelength conversion member according to claim 5 ,
wherein an average particle size of the white pigment is 0.1 μm to 1.0 μm.

7 . The wavelength conversion member according to claim 1 ,
wherein the quantum dot phosphor comprises a compound containing at least one of Cd and In.

8 . The wavelength conversion member according to claim 1 , further comprising
a covering material that covers at least a part of the cured product.

9 . The wavelength conversion member according to claim 8 ,
wherein the covering material has a barrier property against oxygen.

10 . The wavelength conversion member according to claim 1 ,
wherein the carboxylic acid comprises at least one selected from the group consisting of acetic acid, mercaptopropionic acid and methacrylic acid.

11 . The wavelength conversion member according to claim 1 ,
wherein a mass-based content ratio of the carboxylic acid to the quantum dot phosphor (carboxylic acid/quantum dot phosphor) is 0.06 to 6.5.

12 . The wavelength conversion member according to claim 1 ,
wherein the carboxylic acid is acetic acid, and a mass-based content ratio of the carboxylic acid to the quantum dot phosphor (carboxylic acid/quantum dot phosphor) is 0.5 to 6.5.

13 . The wavelength conversion member according to claim 1 ,
wherein the carboxylic acid is mercaptopropionic acid, and a mass-based content ratio of the carboxylic acid to the quantum dot phosphor (carboxylic acid/quantum dot phosphor) is 0.06 to 6.5.

14 . The wavelength conversion member according to claim 1 ,
wherein a content of the quantum dot phosphor in the curable composition with respect to a total amount of the curable composition is 0.15 mass % to 0.3 mass %.

15 . A backlight unit comprising the wavelength conversion member according to claim 1 , and a light source.

16 . An image display device comprising the backlight unit according to claim 15 .

17 . A curable composition comprising a quantum dot phosphor and a carboxylic acid having 1 to 17 carbon atoms.

18 . The curable composition according to claim 17 ,
wherein a mass-based content ratio of the carboxylic acid to the quantum dot phosphor (carboxylic acid/quantum dot phosphor) is 0.06 to 6.5.

19 . The curable composition according to claim 17 ,
wherein the carboxylic acid is acetic acid, and a mass-based content ratio of the carboxylic acid to the quantum dot phosphor (carboxylic acid/quantum dot phosphor) is 0.5 to 6.5.

20 . The curable composition according to claim 17 ,
wherein the carboxylic acid is mercaptopropionic acid, and a mass-based content ratio of the carboxylic acid to the quantum dot phosphor (carboxylic acid/quantum dot phosphor) is 0.06 to 6.5.

21 . The curable composition according to claim 17 ,
wherein a content of the quantum dot phosphor in the curable composition with respect to a total amount of the curable composition is 0.15 mass % to 0.3 mass %.

22 . The curable composition according to claim 17 , further comprising
a multifunctional (meth)acrylate compound having an alicyclic structure, a multifunctional thiol compound and a photopolymerization initiator.

23 . The curable composition according to claim 22 ,
wherein the multifunctional (meth)acrylate compound having an alicyclic structure is a compound containing a tricyclodecane skeleton.

24 . The curable composition according to claim 17 , further comprising
an alkyleneoxy group-containing compound having an alkyleneoxy group and a polymerizable reactive group, a multifunctional thiol compound, and a photopolymerization initiator.

25 . The curable composition according to claim 17 , further comprising a white pigment.

26 . The curable composition according to claim 17 , further comprising an isobornyl (meth)acrylate.

Assignees

• Hitachi Chemical Co Ltd

Inventors

• Yahata Tatsuya
• Kajimoto Takanori
• Kirigaya Kunihiro
• Fukui Masato
• MUKAIGAITO Kouhei

Classifications

• H10H20/8512

  Wavelength conversion materials · CPC title

• H10H20/8511

  characterised by their material, e.g. binder · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F2201/50

  Protective arrangements · CPC title

• G02F1/133614

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title