Aluminate fluorescent material, light emitting device using the same, and method of producing aluminate fluorescent material

Patent metadata

Field	Value
Publication number	US-10208247-B2
Application number	US-201715615896-A
Country	US
Kind code	B2
Filing date	Jun 7, 2017
Priority date	Jun 9, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5<b<a≤0.5b+0.5<1.0, the parameter m satisfies 0≤m≤1.0, and the parameter n satisfies 0.4≤n≤0.7.

First claim

What is claimed is:

1. A light emitting device comprising an aluminate fluorescent material; and an excitation light source, the aluminate fluorescent material comprising:
a first element that contains one or more elements selected from Ba and Sr; and
a second element that contains Mg and Mn, wherein
in a composition of the aluminate fluorescent material, when a molar ratio of Al is taken as 10, a total molar ratio of the first element is a value of a parameter a, a total molar ratio of the second element is a value of a parameter b, a molar ratio of Sr is a product of a value of a parameter m and the value of the parameter a, a molar ratio of Mn is a product of a value of a parameter n and the value of the parameter b, and
the values of the parameters a and b satisfy the following requirement (1), the value of the parameter m satisfies the following requirement (2), and the value of the parameter n satisfies the following requirement (3):
0.5< b<a≤ 0.5 b+ 0.5<1.0  (1),

0≤ m≤ 1.0  (2), and

0.4≤ n≤ 0.7  (3); and

the excitation light source has an emission spectrum within a range of 380 nm or more and 485 nm or less.

2. The light emitting device according to claim 1 , wherein the values of the parameters a and b satisfy the following requirement (4):
0.7< b<a≤ 0.5 b+ 0.5<1.0  (4).

3. The light emitting device according to claim 1 , wherein the composition is represented by the following formula (I):
(Ba 1-m Sr m ) a (Mg 1-n Mn n ) b Al 10 O 15+a+b   (I).

4. The light emitting device according to claim 3 , wherein the values of the parameters a and b satisfy 0.7<b<a≤0.5b+0.5<1.0.

5. The light emitting device according to claim 1 , wherein the excitation light source has an emission peak wavelength within a range of 420 nm or more and 470 nm or less.

Assignees

• Nichia Corp

Inventors

• Yoshida Tomokazu
• Nishimata Kazuya
• Hosokawa Shoji

Classifications

• H10W90/756

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• H10W72/884

  Die-attach connectors and bond wires · CPC title

• H01L2224/73265

  Electricity · mapped topic

• C09K11/643 Primary

  with alkaline earth metals · CPC title

• C09K11/576

  with alkaline earth metals · CPC title