Optical Properties of the (Y,Gd)BO₃:Eu³⁺ Phosphor Coated with Al₂O₃ for a Plasma Display Panel

Abstract

The surface of (Y,Gd)BO₃:Eu³⁺ phosphor, a red-emitting source in the plasma display panel (PDP), was coated with Al₂O₃ nano-particles. Colloidal alumina oxide was selected as a coating material for the surface modification of the (Y,Gd)BO₃:Eu³⁺ phosphor. A modified sol-gel method was used for coating the surface of the phosphor by Al₂O₃ nano-particles. Al₂O₃ nano-particles in the surface of the phosphor were observed by Scanning Electron Microscope. It was found that the luminance intensity was increased in the photo-luminescence (PL) by a suppression of the nonradiative recombination via surface defeats. The experimental results suggest that the surface coating of phosphors with Al₂O₃ nano-particles leads to an increase in the luminance intensity of the PDP and the gas discharge lamps.

Keywords:

• Al₂O₃ nano-particles
• (Y,Gd)BO₃:Eu³⁺ phosphor
• red-emitting
• sol-gel method
• surface coating

Acknowledgments

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.