Patent · US Active

Semiconductor light source with a first and a second LED chip and a first and a second fluorescent substance

US9799633B2 · kind B2 · utility

0Cited by

1References

14Claims

0Family size

Assignee

OSRAM Opto Semiconductors GmbH · DE

Inventors

Ales Markytan · Regensburg, DE
Christian Gärtner · Greifswald, DE

Key dates

Filing date	Jun 6, 2013
Grant date	Oct 24, 2017
Priority date	—
Expiry date	Jun 11, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH01L2924/0002
WIPO fieldSemiconductors
WIPO sectorElectrical engineering

Abstract

A semiconductor light source comprising first and second light-emitting diode chips; and a conversion element containing a first phosphor and a second phosphor, wherein the conversion element is disposed downstream of the first and second light-emitting diode chips. The first light-emitting diode chip emits electromagnetic radiation with a first emission maximum. The second light-emitting diode chip emits electromagnetic radiation with a second emission maximum. The first phosphor has a first absorption maximum and a first radiating maximum. The second phosphor has a second absorption maximum, which differs from the first absorption maximum, and a second radiating maximum, which differs from the first radiating maximum. The degree of conversion of the first phosphor for the electromagnetic radiation of the first light-emitting diode chip is greater than the degree of conversion of the second phosphor for the electromagnetic radiation of the first light-emitting diode chip.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.