LANTHANOID-CONTAINING INORGANIC MATERIAL MICROPARTICLES, WAVELENGTH-CONVERTING INK, COATED ARTICLE, AND DETERMINATION APPARATUS

Title:

LANTHANOID-CONTAINING INORGANIC MATERIAL MICROPARTICLES, WAVELENGTH-CONVERTING INK, COATED ARTICLE, AND DETERMINATION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2017/130943

Kind Code:

A1

Abstract:

The present invention provides lanthanoid-containing inorganic material microparticles which undergo a reduced quantity of energy flow and therefore can achieve high luminous efficiency when the wavelength of light is converted toward a shorter wavelength side. The present invention also addresses the problem of providing: a wavelength-converting ink which can keep the luminous intensity thereof at a high level for a long period upon the conversion of a wavelength and which enables the formation of a printed pattern having high water repellency and excellent retention performance; a coated article provided with the wavelength-converting ink; and a determination apparatus. The present invention provides lanthanoid-containing inorganic material microparticles having a function of converting the wavelength of light toward a shorter wavelength side, wherein each of the microparticles comprises a core particle and a shell layer, the core particle contains a lanthanoid element capable of absorbing light and a lanthanoid element capable of emitting light, the shell layer has at least an outer shell, the ratio of the total amount of the lanthanoid element capable of absorbing light and the lanthanoid element capable of emitting light relative to the amount of rare earth elements contained in the outer shell is 2 mol% or less, the thickness of the outer shell is 2 to 20 nm, and the contacting face between the core particle and the shell layer has no interface and is continuous.

Inventors:

SASAKI TAKU (JP)
WAKIYA TAKESHI (JP)
OOHASHI KENJI (JP)

Application Number:

PCT/JP2017/002293

Publication Date:

August 03, 2017

Filing Date:

January 24, 2017

Export Citation:

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Assignee:

SEKISUI CHEMICAL CO LTD (JP)

International Classes:

C09K11/77; B41M3/14; B42D25/00; C09D11/037; C09K11/08; C09K11/85

Domestic Patent References:

WO2006101015A1	2006-09-28
WO2014165516A1	2014-10-09

Foreign References:

JP2015178602A	2015-10-08
JP2016132685A	2016-07-25

Other References:

YI,G ET AL.: "Water-Soluble NaYF4:Yb, Er(Tm)/ NaYF4/Polymer Core/Shell/Shell Nanoparticles with Significant Enhancement of Upconversion Fluorescence", CHEMISTRY OF MATERIALS, vol. 19, 2007, pages 341 - 343, XP002558475