Flame spray pyrolysis has been utilized in order to improve the photoluminescence (PL) intensity of blue-emitting Sr5(PO4)3Cl:Eu2+ phosphor particles for light emitting diode applications. When Sr5(PO4)3Cl:Eu2+ phosphor particles were prepared by conventional spray pyrolysis, the PL intensity was much lower than that of commercial Sr5(PO4)3Cl:Eu2+ phosphor particles. However, Sr5(PO4)3Cl:Eu2+ phosphor particles prepared by the flame spray pyrolysis showed a high PL intensity compared with the commercial one. The morphology and the crystallinity of Sr5(PO4)Cl:Eu2+ phosphor particles are strongly affected by the flame condition and the post-treatment environment. Sr5(PO4)3Cl:Eu2+ particles prepared by flame spray pyrolysis were of smaller size than commercial ones, although their spherical morphology was not maintained after the post-treatment at 1000°C with NH4Cl flux. The addition of NH4Cl flux during post-treatment greatly enhances the PL intensity of prepared Sr5(PO4)3Cl:Eu2+ phosphor particles due to increased crystallinity. It was found that the phosphor particles with larger crystallite size have higher PL intensity regardless of the method of preparation.
|Journal||Journal of the Electrochemical Society|
|Publication status||Published - 2003 Feb|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry