Phosphor

Patent metadata

Field	Value
Publication number	US-10370590-B2
Application number	US-201615247973-A
Country	US
Kind code	B2
Filing date	Aug 26, 2016
Priority date	Aug 28, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A phosphor is represented by the general formula

a M I X·M II 1-x M I M V O 4 :(Re) x

where M I is at least one atomic element selected from the group consisting of K, Li, Na, Rb, Cs, Fr, Cu, and Ag, with K being essential; M II is at least one atomic element selected from the group consisting of Mg, Ca, Sr, Ba, Ra, Mn, Zn, Cd, and Sn; M V is at least one atomic element selected from the group consisting of P, V, Nb, Ta, As, Sb, and Bi; X is at least one halogen element, with F being essential; Re is at least one atomic element selected from the group consisting of rare earth elements, with Eu being essential; and a is in the range 0.6≤a≤1.4.

First claim

What is claimed is:

1. A phosphor represented by the general formula aM I X·M II 1-x M I M V O 4 : (Re) x ,
where
M I is at least one atomic element selected from the group consisting of K, Li, Cs, and Ag, with K being essential;
M II is at least one atomic element selected from the group consisting of Mg, Ca, Mn, Zn, Cd, and Sn, with Ca being essential;
M V is at least one atomic element selected from the group consisting of P, V, Nb, Ta, Sb, and Bi, with P being essential;
X is at least one halogen element selected from the group consisting of F, Br, and I, with F being essential;
Re is at least one atomic element selected from the group consisting of Eu, Sc, Y, La, Pr, Nd, Gd, Tb, Dy, Ho, Er, Yb, Lu, and Ce, with Eu being essential,
a is in the range 0.6≤a≤1.4;
x is in a range of 0.007≤×≤0.2; and
at least one of the following conditions (1)-(5) is met:
(1) M I also includes at least one atomic element selected from the group consisting of Li, Cs, and Ag,
(2) M II also includes at least one atomic element selected from the group consisting of Mg, Mn, Zn, Cd, and Sn,
(3) M V also includes at least one atomic element selected from the group consisting of V, Nb, Ta, Sb, and Bi,
(4) X also includes at least one atomic element selected from the group consisting of Br or I, and
(5) Re also includes at least one atomic element selected from the group consisting of Sc, Y, La, Pr, Nd, Gd, Tb, Dy, Ho, Er, Lu, and Ce.

2. The phosphor according to claim 1 , wherein
a peak wavelength of an excitation spectrum is no greater than 420 nm; and
an excitation edge of the excitation spectrum is no greater than 450 nm.

3. The phosphor according to claim 1 , wherein
a peak wavelength of an emission spectrum is in a range from 600 nm to 700 nm;
a peak wavelength of an excitation spectrum is no greater than 420 nm; and
an excitation edge of the excitation spectrum is no greater than 450 nm.

4. The phosphor according to claim 1 , wherein
in an X-ray diffraction pattern in which a Cu Kα characteristic X-ray is used, at least part of a crystal included in the phosphor has:
a first diffraction peak, a second diffraction peak, and a third diffraction peak in a range in which a diffraction angle 2θ is from 31.0° to 33.0°, and when a diffraction intensity of the first diffraction peak, which has the highest intensity, is taken as 100, the diffraction intensities of the second diffraction peak and of the third diffraction peak are from 30 to 50 ;
a fourth diffraction peak having a diffraction intensity of from 15 to 25 in a range in which the diffraction angle 2θ is from 27.0° to 29.0°;
a fifth diffraction peak having a diffraction intensity of from 15 to 25 in a range in which the diffraction angle 2θ is from 41.0° to 43.0°;
a sixth diffraction peak having a diffraction intensity of from 10 to 15 in a range in which the diffraction angle 2θ is from 29.0° to 31.0°;
a seventh diffraction peak having a diffraction intensity of from 10 to 15 in a range in which the diffraction angle 2θ is from 36.0° to 39.0°; and
an eighth diffraction peak having a diffraction intensity of from 5 to 10 in a range in which the diffraction angle 2θ is from 13.0° to 15.0 °.

5. The phosphor according to claim 1 , wherein at least part of a crystal included in the phosphor has an orthorhombic crystal system, a simple Bravais lattice, and a P 21 /m space group.

Assignees

• Koito Mfg Co Ltd
• Tokyo Inst Tech
• Univ Nagoya Nat Univ Corp

Inventors

• Daicho Hisayoshi
• Shinomiya Yu
• Enomoto Kiminori
• Hosono Hideo
• Matsuishi Satoru
• Sawa Hiroshi
• Nakano Akitoshi

Classifications

• C09K11/7739

  with halogens · CPC title

• C09K11/7742

  Antimonates; Arsenates · CPC title

• C09K11/7796 Primary

  with alkaline earth metals · CPC title