Wavelength conversion member, and light emitting device using same

Patent metadata

Field	Value
Publication number	US-11034609-B2
Application number	US-201716091115-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Jun 27, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

Provided is a wavelength conversion member that is less decreased in luminescence intensity with time by irradiation with light of an LED or LD and a light emitting device using the wavelength conversion member. A wavelength conversion member is formed of an inorganic phosphor dispersed in a glass matrix, wherein the glass matrix contains, in % by mole, 30 to 85% SiO 2 , 0 to 20% B 2 O 3 , 0 to 25% Al 2 O 3 , 0 to 3% Li 2 O, 0 to 3% Na 2 O, 0 to 3% K 2 O, 0 to 3% Li 2 O+Na 2 O+K 2 O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to 4% ZnO, and the inorganic phosphor is at least one selected from the group consisting of an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an oxychloride phosphor, a halide phosphor, an aluminate phosphor, and a halophosphate phosphor.

First claim

The invention claimed is:

1. A wavelength conversion member formed of an inorganic phosphor dispersed in a glass matrix, wherein
the glass matrix contains, in % by mole, 30 to 85% SiO 2 , 0 to 20% B 2 O 3 , 0.1 to 25% Al 2 O 3 , 0 to 3% Li 2 O, 0 to 1% Na 2 O, 0 to 3% K 2 O, 0 to 1% Li 2 O+Na 2 O+K 2 O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to 4% ZnO, and
the glass matrix has a softening point of 829 to 1100° C., and
the inorganic phosphor is at least one selected from the group consisting of an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an oxychloride phosphor, a halide phosphor, an aluminate phosphor, and a halophosphate phosphor.

2. The wavelength conversion member according to claim 1 , wherein the glass matrix contains, in % by mole, 30 to 85% SiO 2 , 0 to 20% B 2 O 3 , 0.1 to 25% Al 2 O 3 , 0 to 3% Li 2 O, 0 to 1% Na 2 O, 0 to 3% K 2 O, 0 to 1% Li 2 O+Na 2 O+K 2 O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to below 1.8% ZnO.

3. The wavelength conversion member according to claim 1 , containing the inorganic phosphor in an amount of 0.01 to 70% by mass.

4. The wavelength conversion member according to claim 1 , being made of a sintered powder body.

5. A light emitting device comprising: the wavelength conversion member according to claim 1 ; and a light source operable to irradiate the wavelength conversion member with excitation light.

6. An on-vehicle lighting in which the light emitting device according to claim 5 is used.

7. The on-vehicle lighting according to claim 6 for use as a headlamp.

Assignees

• Nippon Electric Glass Co

Inventors

• Fujita Naoki
• Murata Takashi

Classifications

• C03C14/00

  Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix (devitrified glass ceramics C03C10/00) · CPC title

• C03C4/12 Primary

  for luminescent glass; for fluorescent glass · CPC title

• C03C3/093

  containing zinc or zirconium · CPC title

• C03C3/091

  containing aluminium · CPC title

• C09K11/77747

  Silicon Nitrides or Silicon Oxynitrides · CPC title