Conversion LED with high color rendition index

US9234132B2 · kind B2 · utility

Assignee

• OSRAM Opto Semiconductors GmbH · DE

Inventors

• Frank Baumann · Regensburg, DE
• Norbert Boenisch · Birkenfeld, DE
• Tim Fiedler · Birkenfeld, DE
• Frank Jermann · Königsbrunn, DE
• Stefan Lange · Shepperton, GB
• Reiner Windisch · Nittendorf, DE

Key dates

• Filing date: Aug 11, 2010
• Grant date: Jan 12, 2016
• Expiry date: Sep 24, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/73265
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A conversion LED comprising a chip which emits primary radiation and a luminescent substance-containing layer which is on the chip or positioned so that it intercepts the primary radiation emitted from the chip and which converts at least some of the primary radiation of the chip into secondary radiation, wherein a first luminescent substance of the A3B5O12:Ce garnet type which emits yellow green and a second luminescent substance of the MAlSiN3:Eu calsine type which emits orange red is used, wherein the peak wavelength of the primary radiation lies in the 435 to 455 nm range, the first luminescent substance being a garnet having essentially the cation A=75 to 100% Lu, remainder Y and a Ce content of 1.5 to 2.9%, where B=10 to 40% Ga, remainder Al, while the second luminescent substance is of the basic MAlSiN3:Eu type where M is Ca alone or at least 80%, in particular at least 90%, preferably at least 95% Ca and the remainder of M may be Sr, Ba, Mg, Li or Cu, in each case alone or in combination, wherein some of the Al up to 20%, preferably at most 5%, can be replaced by B, and wherein N can be partially replaced by O, F, Cl, alone or in combination.