Preparation and Characterization of Blue-Emitting (SrCaBa)₃(PO₄)₂•SrCl₂:Eu²⁺ Phosphors

Abstract:

For the demand of high color rendering W-LED, we chose (SrCaBa)₃(PO₄)₂SrCl₂:Eu²⁺ blue-emitting phosphor powder as the object of our study, and use high-temperature solid-state reaction method to prepare the phosphor powders in a weak reducing atmosphere. A detailed investigation on the reaction parameters, including kinds and relative ratio of raw materials, sintering temperature and Eu²⁺ activator concentration was conducted in terms of luminescent properties of phosphors powder. Research findings show that optimal reaction parameters are: sintering temperature is 1200°C, Eu²⁺ doping level is 0.15mol. By these parameters, the (SrCaBa)₃(PO₄)₂SrCl₂:Eu²⁺ phosphor powder show bright blue emission around 450nm and can be efficiently excited by violet and ultraviolet light (200nm-440nm). Further we employed the energy transfer between Tb³⁺ and Eu²⁺ and prepared a series of phosphors using (SrCaBa)₃(PO₄)₂SrCl₂ as host material_. Research findings show that emission color can be adjusted from blue to blue green by the ratio of Tb³⁺ to Eu²⁺, with line-like Tb³⁺ green emission overlapped on band-like Eu²⁺ blue emission.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 890-893
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.890
• Online since: August 2013
• Authors: Dan Cheng*, Zhao Hai Yang
• Keywords: High-Temperature Solid-State Reaction, Luminescence, Phosphor, White LED

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