Aluminate fluorescent material and light emitting device

Patent metadata

Field	Value
Publication number	US-10196278-B2
Application number	US-201715667975-A
Country	US
Kind code	B2
Filing date	Aug 3, 2017
Priority date	Aug 5, 2016
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

Provided is an aluminate fluorescent material having a composition represented by the formula X1aMgbMncAldOa+b+c+1.5d, in which X1 is at least one element selected from the group consisting of Ba, Sr; and Ca, a, b, c, and d satisfy 0.5≤a≤1.0, 0.0≤b<0.4, 0.3≤c≤0.7, 8.5≤d≤13.0, and 9.0≤b+c+d≤14.0.

First claim

What is claimed is:

1. An aluminate fluorescent material having a composition represented by the formula X1 a Mg b Mn c Al d O a+b+c+1.5d , wherein X1 is at least one element selected from the group consisting of Ba, Sr, and Ca; and a, b, c, and d satisfy 0.5≤a≤1.0, 0.00≤b≤0.38, 0.30≤c≤0.60, 8.5≤d≤13.0, and 9.0≤b+c+d≤14.0; wherein an emission spectrum of the aluminate fluorescent material has a peak emission intensity at a wavelength in a range of 505 nm to 550 nm, and a relative emission intensity at 535 nm in the emission spectrum with respect to the peak emission intensity is in a range of 51% to 80%.

2. The aluminate fluorescent material according to claim 1 , wherein the composition is represented by the formula (Ba 1−m Sr m ) a Mg b Mn c Al d O a+b+c+1.5d , wherein
m satisfies 0.0 ≤m ≤1.0.

3. The aluminate fluorescent material according to claim 1 , wherein b, c, d satisfy 0.00 ≤b ≤0.15, 0.4 ≤c ≤0.6, and 9.0 ≤d ≤13.0.

4. The aluminate fluorescent material according to claim 1 , wherein light emitted from the aluminate fluorescent material has a chromaticity with chromaticity coordinates in a range of 0.180 ≤x ≤0.250 and 0.700 ≤y ≤0.730 in the CIE 1931 color space.

5. The aluminate fluorescent material according to claim 1 , wherein an emission spectrum of the aluminate fluorescent material has a peak emission intensity at a wavelength in a range of 515 nm to 523 nm.

6. A light emitting device comprising:
the aluminate fluorescent material according to claim 1 ; and
an excitation light source.

7. The light emitting device according to claim 6 , wherein the excitation light source is to emit light which has a peak emission wavelength in a range of 380 nm to 485 nm.

Assignees

• Nichia Corp

Inventors

• Nishimata Kazuya
• Hosokawa Shoji
• Yoshida Tomokazu

Classifications

• C09K11/576

  with alkaline earth metals · CPC title

• C09K11/643

  with alkaline earth metals · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01F1/00

  Methods of preparing compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or the rare earths, in general · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title