BROADBAND INFRARED LIGHT EMITTING DEVICE

• US 20130119280A1
• Filed: 07/04/2011
• Published: 05/16/2013
• Est. Priority Date: 07/12/2010
• Status: Active Grant

• Current Assignee: Nagoya University
• Original Assignee: Nagoya University
• Inventors: Takeda, Yoshikazu, Fuchi, Shingo
• Granted Patent: US 9,062,853 B2
• Time in Patent Office: Days
• US Class Current: 250/504.R
• CPC Class Codes: C03B 2201/28 doped with phosphorus
• CPC Class Codes: C03B 2201/30 doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
• CPC Class Codes: C03B 2201/34 doped with rare earth metals, i.e. with Sc, Y or lanthanides, e.g. for laser-amplifiers
• CPC Class Codes: C03C 3/15 containing rare earths
• CPC Class Codes: C03C 4/12 for luminescent glass; for fluorescent glass
• CPC Class Codes: C03C 8/22 containing two or more distinct frits having different compositions
• CPC Class Codes: C09K 11/776 Chalcogenides
• CPC Class Codes: C09K 11/7782 Antimonates; Arsenates
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: H01L 2224/13 of an individual bump connector
• CPC Class Codes: H01L 2224/16245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 33/501 : characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/504 : Elements with two or more wavelength conversion materials

Abstract

[PROBLEM] There is provided a broadband infrared light emitting device that radiates infrared light having a band broader than a conventional broadband infrared light emitting device.

[MEANS FOR SOLVING] The broadband infrared light emitting device at least includes: a light source 4 that emits first excitation light λ1 in a first wavelength range; a first glass phosphor 51 that has an excitation band in a first wavelength range, and when the first excitation light λ1 is incident thereon, emits second excitation light λ2 in a second wavelength range and first infrared light λ3 in a third wavelength range; and a second glass phosphor 52 that has an excitation band in the second wavelength range and does not have an excitation band in the third wavelength range, and when the second excitation light λ2 is incident thereon, allows the first infrared light λ3 to pass therethrough and emits second infrared light λ4 in a fourth wavelength range, and the broadband infrared light emitting device radiates broadband infrared light including at least a part of the third wavelength range and at least a part of the fourth wavelength range to an outside of the broadband infrared light.

Claims

1. A broadband infrared light emitting device at least comprising:

a light source that emits first excitation light in a first wavelength range;

a first glass phosphor that has an excitation band in the first wavelength range, and when the first excitation light is incident thereon, emits second excitation light in a second wavelength range and first infrared light in a third wavelength range; and

a second glass phosphor that has an excitation band in the second wavelength range and does not have an excitation band in the third wavelength range, and when the second excitation light is incident thereon, allows the first infrared light to pass therethrough and emits second infrared light in a fourth wavelength range, wherein

the broadband infrared light emitting device radiates broadband infrared light including at least a part of the third wavelength range and at least a part of the fourth wavelength range to an outside of the broadband infrared light.

2. The broadband infrared light emitting device according to claim 1, wherein

the third wavelength range is shorter than the fourth wavelength range;

the first glass phosphor, when the first excitation light is incident thereon, emits third infrared light in a fifth wavelength range that is longer than the fourth wavelength range;

the second glass phosphor does not have an excitation band in the fifth wavelength range; and

the broadband infrared light includes at least a part of the third wavelength range, at least a part of the fourth wavelength range, and at least a part of the fifth wavelength range.

3. The broadband infrared light emitting device according to claim 2, wherein

an emission center of the first glass phosphor is an Sm ion;

and

an emission center of the second glass phosphor is a Yb ion and an Nd ion.

4. The broadband infrared light emitting device according to claim 3, wherein

the first wavelength range is from 380 nm to 440 nm;

the second wavelength range is from 550 nm to 670 nm;

the third wavelength range is from 850 nm to 970 nm;

the fourth wavelength range is from 950 nm to 1070 nm; and

the fifth wavelength range is from 1100 nm to 1220 nm.

5. The broadband infrared light emitting device according to claim 4, further comprising

a third glass phosphor that has an excitation band in a predetermined wavelength range, and when predetermined excitation light is incident thereon, emits fourth infrared light in a sixth wavelength range, wherein

the broadband infrared light includes at least a part of the third wavelength range, at least a part of the fourth wavelength range, and at least a part of the sixth wavelength range.

6. The broadband infrared light emitting device according to claim 5, wherein

the predetermined wavelength range is at least a part of at least one of the second wavelength range, the third wavelength range, the fourth wavelength range, and the fifth wavelength range.

7. The broadband infrared light emitting device according to claim 6, wherein

an emission center of the third glass phosphor is an Er ion.

8. The broadband infrared light emitting device according to claim 7, wherein

the sixth wavelength range is from 1450 nm to 1630 nm.

9. The broadband infrared light emitting device according to claim 1, wherein

the light source is a semiconductor light emitting device;

and

the first glass phosphor seals the semiconductor light emitting device.

10. The broadband infrared light emitting device according to claim 9, wherein

the second glass phosphor covers the first glass phosphor.

11. The broadband infrared light emitting device according to claim 10, wherein

matrices of the first glass phosphor and the second glass phosphor are glasses of the same system.

12. The broadband infrared light emitting device according to claim 11, wherein

the matrices of the phosphors are made of Sb₂O₃—

B₂O₃ glasses.

13. The broadband infrared light emitting device according to claim 1, further comprising

a third glass phosphor that has an excitation band in a predetermined wavelength range, and when predetermined excitation light is incident thereon, emits fourth infrared light in a sixth wavelength range, wherein

the broadband infrared light includes at least a part of the third wavelength range, at least a part of the fourth wavelength range, and at least a part of the sixth wavelength range.

14. The broadband infrared light emitting device according to claim 2, further comprising

a third glass phosphor that has an excitation band in a predetermined wavelength range, and when predetermined excitation light is incident thereon, emits fourth infrared light in a sixth wavelength range, wherein

the broadband infrared light includes at least a part of the third wavelength range, at least a part of the fourth wavelength range, and at least a part of the sixth wavelength range.