Lighting device for generating a light emission and method for generating a light emission

• US 9,709,225 B2
• Filed: 09/02/2013
• Issued: 07/18/2017
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Schulz, Robert, Stoll, Ion, Eisert, Dominik, Gtz, Britta
• Primary Examiner(s): BANNAN, JULIE A
• Application Number:
  US14/430,946
• Publication Number:
  US 20150252963A1
• Time in Patent Office: 1,415 Days
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/02 Combinations of only two kinds of elements
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light

Abstract

A lighting device, in various embodiments, for generating a light emission, has a light source designed to generate light with a first dominant wavelength, a first converter designed to absorb the light generated by the light source and to emit light with a second dominant wavelength, which is longer than the first dominant wavelength, and a second converter designed to absorb a portion of the light emitted by the first converter and to emit light such that the light emission has a third dominant wavelength, which is longer than the second dominant wavelength.

Claims

1. A lighting device for generating a light emission, the lighting device comprising:

a light source configured to generate light with a first dominant wavelength, wherein the light source comprises a chip;

a first converter configured to absorb the light generated by the light source and emit light with a second dominant wavelength, which is greater than the first dominant wavelength, wherein the second dominant wavelength is less than 610 nm; and

a second converter configured to absorb a light component of the light emitted by the first converter and emit light such that the light emission has a third dominant wavelength, which is greater than the second dominant wavelength, wherein the second converter comprises an organic phosphor,

wherein the second converter comprises a particle size that is smaller than the second dominant wavelength,

wherein the first converter is arranged directly on the chip and the second converter is arranged directly on the first converter,

wherein substantially no radiation of the light with the first dominant wavelength impinges on the second converter, and

wherein at least 95% of the light with the first dominant wavelength is converted by the first converter.

2. The lighting device according to claim 1, wherein the first dominant wavelength lies in a spectral range of blue light, the first converter fully converts the light of the light source into yellowy-red light, and wherein the second converter emits light in a long-wave range of the first converter or in an infrared range, the first converter and the second converter comprising different phosphors.

3. The lighting device according to claim 1, wherein the light component contains up to 30% of a light output of the first converter.

4. The lighting device according to claim 1, wherein the second converter is configured to emit light with a fourth dominant wavelength, which is greater than the second dominant wavelength.

5. The lighting device according to claim 1, wherein the second converter is configured to absorb the light component of the light emitted by the first converter and emit light such that the light emission has a greater peak wavelength in comparison with the light emitted by the first converter.

6. The lighting device according to claim 1, further comprising a lens, wherein the second converter is contained in the lens of the lighting device or is arranged at least partially around the lens of the lighting device.

7. The lighting device according to claim 1, wherein the light source has a light-emitting diode component with a package, the package having a cavity for receiving the second converter.

8. The lighting device according to claim 7, wherein the second converter is contained in a matrix material, which is accommodated in the cavity.

9. The lighting device according to claim 1, wherein the chip is arranged on a substrate.

10. The lighting device according to claim 1, wherein the third dominant wavelength is in a range from 615 nm to 625 nm.

13. The method according to claim 1, wherein the light emitted by the second converter has a fourth dominant wavelength, which is greater than the second dominant wavelength.

11. A method for generating a light emission, the method comprising:

generating light with a first dominant wavelength by a light source comprising a chip;

absorbing the generated light and emitting light with a second dominant wavelength, which is greater than the first dominant wavelength, by a first converter, wherein the second dominant wavelength is less than 610 nm; and

absorbing a light component of the light emitted by the first converter and emitting light by a second converter such that the light emission has a third dominant wavelength, which is greater than the second dominant wavelength, wherein the second converter comprises an organic phosphor,

wherein the second converter comprises a particle size that is smaller than the second dominant wavelength,

wherein the first converter is arranged directly on the chip and the second converter is arranged directly on the first converter,

wherein substantially no radiation of the light with the first dominant wavelength impinges on the second converter, and

wherein at least 95% of the light with the first dominant wavelength is converted by the first converter.

12. The method according to claim 11, wherein the light component contains up to 30% of a light output by the first converter.

14. The method according to claim 11, wherein the third dominant wavelength is in a range from 615 nm to 625 nm.

15. A lighting device for generating a light emission, the lighting device comprising:

a light source configured to generate light with a first dominant wavelength, wherein the light source comprises a chip;

a first converter configured to absorb the light generated by the light source and emit light with a second dominant wavelength, which is greater than the first dominant wavelength; and

a second converter configured to absorb a light component of the light emitted by the first converter and emit light such that the light emission has a third dominant wavelength, which is greater than the second dominant wavelength, wherein the second converter comprises an organic phosphor,

wherein the second converter comprises a particle size that is smaller than the second dominant wavelength,

wherein the first converter is arranged directly on the chip and the second converter is arranged directly on the first converter,

wherein the first dominant wavelength lies in a spectral range of blue light,

wherein the first converter fully converts the light of the light source into yellowy-red light with wavelengths of between at least 580 nm and less than 610 nm,

wherein the second converter emits light in a long-wave range of the first converter or in an infrared range,

wherein substantially no radiation of the light with the first dominant wavelength impinges on the second converter, and

wherein the first converter and the second converter comprise different phosphors.