Blue fluorescent powder for three primary color warm white light LED and preparation method therefor

US11142690B2 · kind B2 · utility

Assignee

• XIAMEN UNIVERSITY · CN

Inventors

• Chao-Min Chen · Fujian, CN
• Xing-Jun Yang · Nanshan, CN
• Jiachao Chen · Fujian, CN
• Yang Li · Shanghai, CN

Key dates

• Filing date: Dec 21, 2018
• Grant date: Oct 12, 2021
• Expiry date: Dec 21, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present disclosure discloses a blue fluorescent powder for a three primary color warm white LED and a preparation method thereof. SrCO3, NH4Cl, H3BO3, Eu2O3, and NH4H2PO4 function as raw materials to obtain a chemical formula of a blue fluorescent powder Sr(2-x)Eux(BO3)y(PO4)(1-y)Cl in a reducing atmosphere by a solid-state sintering method, wherein 0.001≤x≤0.1 and 0.001≤y≤0.5. The blue fluorescent powder is mixed with CaAlSiN3:Eu2+ red fluorescent powder and (SrBa)2SiO4:Eu2+ green fluorescent powder at a certain proportion to emit warm white light with a light efficiency and a color rendering index under a violet light excitation. An application prospect is wide.