Crystal of europium compound and method for producing crystal of europium compound

Patent metadata

Field	Value
Publication number	US-12276039-B2
Application number	US-202117911537-A
Country	US
Kind code	B2
Filing date	Mar 16, 2021
Priority date	Mar 17, 2020
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

The present invention provides a crystal of a europium compound containing europium. The present invention enables the preparation of a crystal of a europium compound having a powder X-ray diffraction pattern having a first diffraction peak in diffraction angle (2θ) range of 34.3° to 36.1° in which a half width of the first diffraction peak is 1.8° or less, and/or having a second diffraction peak in diffraction angle (2θ) range of 28.6° to 29.6° and a third diffraction peak in diffraction angle (2θ) range of 36.8° to 38.4° in which a half width of the second diffraction peak is 1.0° or less and a half width of the third diffraction peak is 1.6° or less, and
being at least one compound selected from compounds represented by formulae (1) to (4):

EuCl x   (1)

Eu(OH) 2   (2)

Eu(OH) 2 Cl  (3)

EuOCl  (4)
x is 0.05 or more and 5 or less.

First claim

The invention claimed is:

1. A crystal of a europium compound containing europium,
having a powder X-ray diffraction pattern having a first diffraction peak in a diffraction angle (2θ) range of 34.3° to 36.1° in which a half value width of the first diffraction peak is 1.1° or less, and/or having a second diffraction peak in a diffraction angle (2θ) range of 28.6° to 29.6° and a third diffraction peak in a diffraction angle (2θ) range of 36.8° to 38.4° in which a half value width of the second diffraction peak is 0.6° or less and a half value width of the third diffraction peak is 1.0° or less, and
is at least one compound represented by the following chemical formulae (1) to (4):
EuCl x   (1)

Eu(OH) 2   (2)

Eu(OH) 2 Cl  (3)

EuOCl  (4)

wherein in the formula (1), x is 0.05 or more and 5 or less.

2. The crystal of a europium compound of claim 1 , wherein an excitation wavelength and a light-emission wavelength are in a visible light region.

3. A light emitting compound comprising a composite, the composite comprising the crystal of the europium compound according to claim 1 , and
a spherical-shaped silicate-based base material, and the surface of the light-emitting nanoparticle is modified by an amino group.

4. A method for producing the crystal of a europium compound according to claim 1 , the method comprising:
mixing a silicate-based base material and europium chloride (III) hexahydrate with each other to carry out a solid-phase mechanochemical reaction,
wherein the silicate-based base material contains elemental silicon (Si) and elemental oxygen (O), and has a solid 29 Si-NMR spectrum satisfying Q 4 /Q 3 of 2.0 to 3.9 where Q 4 represents a peak area derived from Si(OSi) 4 and Q 3 represents a peak area derived from HO-Si(OSi) 3 , and
the solid-phase mechanochemical reaction is carried out by adding the europium chloride (III) hexahydrate such that a percentage of a number of moles of elemental europium with respect to a total number of moles of elemental silicon of the silicate-based base material and elemental europium is 1.0 mol % or more, and under a load of 4 N or more and 24 N or less.

Assignees

• Ohara Kk
• National Univ Corporation Nagaoka Univ Of Technology
• National Institute Of Tech

Inventors

• Chatani Sunao
• Inui Masahiko
• Tagaya Motohiro
• Kataoka Takuya
• Motozuka Satoshi

Classifications

• C30B29/12

  Halides · CPC title

• C09K11/7729

  Chalcogenides · CPC title

• C09K11/7732

  Halogenides · CPC title

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C01F17/224

  Oxides or hydroxides of lanthanides · CPC title