Radiation-emitting optoelectronic device

Patent metadata

Field	Value
Publication number	US-9859473-B2
Application number	US-201414900155-A
Country	US
Kind code	B2
Filing date	Jun 23, 2014
Priority date	Jun 24, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A radiation-emitting optoelectronic device is provided. The radiation-emitting optoelectronic device includes a semiconductor chip that, when the device is in operation, emits primary radiation of a wavelength of between 600 nm and 1000 nm. A conversion element includes a conversion material comprising ions of one or more metals selected from a group comprising La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Cr, Pb and Mg. The conversion material converts the primary radiation emitted by the semiconductor chip virtually completely into secondary radiation of a wavelength of between 1000 nm and 6000 nm.

First claim

The invention claimed is:

1. A radiation-emitting optoelectronic device comprising:
a semiconductor chip configured to emit primary radiation of a wavelength of between 800 nm and 1000 nm when the device is in operation; and
a conversion element that comprises a conversion material comprising a host material and ions of at least one metal selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Cr,
wherein the host material with the ions form a compound of a formula, the formula being one of (A,B) 3 X 5 O 12 , (A,B) 2 X* 3 O 12 , C 3 (A,B) 2 Z 3 O 12 , C 3 (A,B) 2 Z* 6 O 24 and (A,B) 3 X 5 N 8 ,
wherein:
A=Fe 3+ , Cr 3+ , V 3+ , Ti 3+ , Sc 3+ , Lu 3+ or Y 3+ ;
B is a trivalent cation of a metal selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Cr;
C=Mg 2+ , Fe 2+ , Mn 2+ , Pb 2+ or Ca 2+ ;
X=Al 3+ or B 3+ ;
X*=W 6+ ;
Z=Si 4+ or Ti 4+ ; and
Z*=W 6+ , and

wherein the conversion material is configured to convert the primary radiation emitted by the semiconductor chip with a conversion over 95% into secondary radiation of a wavelength of between woo nm and 6000 nm when the device is in operation.

2. The radiation-emitting optoelectronic device according to claim 1 , wherein B=Ho 3+ or Tm 3+ .

3. The radiation-emitting optoelectronic device according to claim 1 , wherein the conversion element comprises a sensitizer that is excited by the emitted primary radiation when the device is in operation, wherein an exciton is excited from a basic state to a higher energy level, the exciton is transferred to the conversion material and the conversion material emits a secondary radiation of a wavelength of between 1000 nm and 6000 nm.

4. The radiation-emitting optoelectronic device according to claim 1 , wherein the conversion element is part of a potting compound of the semiconductor chip.

5. The radiation-emitting optoelectronic device according to claim 1 , wherein the conversion element forms a potting compound.

6. The radiation-emitting optoelectronic device according to claim 1 , wherein the conversion element takes the form of a layer that is in direct contact with the semiconductor chip.

7. A gas sensor comprising:
a radiation-emitting optoelectronic device according to claim 1 ,
a detector configured to detect radiation; and
a gas chamber arranged between the radiation-emitting optoelectronic device and the detector,
wherein the radiation detected by the detector is at least one of the primary radiation and secondary radiation emitted by the radiation-emitting optoelectronic device and then passed through the gas chamber.

8. A method of producing a radiation-emitting optoelectronic device, the method comprising:
providing a semiconductor chip configured to emit primary radiation of a wavelength of between 800 nm and 1000 nm; and
applying a conversion element over the semiconductor chip, the conversion element comprising a conversion material comprising a host material and ions of at least one metal selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Cr,
wherein the host material with the ions form a compound of a formula, the formula being one of (A,B) 3 X 5 O 12 , (A,B) 2 X* 3 O 12 , C 3 (A,B) 2 Z 3 O 12 , C 3 (A,B) 2 Z* 6 O 24 and (A,B) 3 X 5 N 8 ,
wherein:
A=Fe 3+ , Cr 3+ , V 3+ , Ti 3+ , Sc 3+ , Lu 3+ or Y 3+ ;
B is a trivalent cation of a metal selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Cr;
C=Mg 2+ , Fe 2+ , Mn 2+ , Pb 2+ or Ca 2+ ;
X=Al 3+ or B 3+ ;
X*=W 6+ ;
Z=Si 4+ or Ti 4+ ; and
Z*=W 6+ , and

wherein the conversion material configured to convert the primary radiation emitted by the semiconductor chip with a conversion over 95% into secondary radiation of a wavelength of between 1000 nm and 6000 nm.

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Göötz Britta
• Halbritter Hubert

Classifications

• H10W90/756

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W90/736

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10W72/5363

  the connected ends being wedge-shaped · CPC title

• H10W72/01515

  Forming coatings · CPC title