Coated luminescent material and light-emitting device having such a luminescent material

US7345413B2 · kind B2 · utility

Assignees

• Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE
• OSRAM Opto Semiconductors GmbH · DE

Inventors

• Bert Braune · Völklingen, DE
• Martin Zachau · Geltendorf, DE
• Franz Zwaschka · Ismaning, DE

Key dates

• Filing date: Feb 9, 2004
• Grant date: Mar 18, 2008
• Expiry date: Dec 15, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8512
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A coated luminescent material having a luminescent material powder formed by grains, the luminescent grains being coated, and the coating being at most 5 nm, preferably at most 2 nm.