Optical Properties of the BaMgAl₁₀O₁₇:Eu²⁺ Phosphor Coated with Al₂O₃ by Using a Modified Sol-Gel Method

Abstract

The surface of BaMgAl₁₀O₁₇:Eu²⁺ (BAM) phosphor, blue-emitting source in the plasma display panel (PDP), was coated with Al₂O₃ nano-particles. The surface modification of the phosphor was performed by a modified sol-gel method using the colloidal alumina as surface coating material. The surface morphologies of non-coated and Al₂O₃ coated BAM phosphors were compared by SEM(Scanning Electron Microscope). We observed the oxide nano-particles on the surface of Al₂O₃ coated phosphors. We also observed that the luminance intensity in the photo-luminescence(PL) was increased. This change in the PL intensity can be explained by a suppression of the nonradiative recombination via surface defects. The experimental results suggest that the surface modification of phosphors with nano-particles of oxide leads to an increase in the luminance intensity of red phosphor in the PDP and the gas discharge lamps.

Keywords:

• BAM phosphor
• blue-emitting
• nano-particles
• sol-gel method
• surface coating
• Al₂O₃

Acknowledgments

This work was supported by the Regional Innovation Center Program (ADMRC) of the Ministry of Knowledge Economy, Republic of Korea. This research was financially supported by the Ministry of Commerce, Industry and Energy (MOCIE) and Korea Industrial Technology Foundation (KOTEF) through the Human Resource Training Project for Regional Innovation.