Preparation of novel phosphor using intercalation of tobermorite

• Published in: Journal of luminescence Vol. 129; no. 7; pp. 751 - 754
• Main Authors: Kojima, Yoshiyuki, Kamei, Shinnosuke, Toyama, Takeshi, Nishimiya, Nobuyuki
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2009; Elsevier
• Subjects: Amorphous; Concentration quenching; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Intercalation; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Phosphor; Photoluminescence; Physics; Red-emitting; Tobermorite; Red-emitting; Amorphous; Tobermorite; Intercalation; Phosphor; Concentration quenching; Impurity density; Doping; Photoluminescence; Heat treatments; Europium additions; Energy-level transitions; Phosphors
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2009.02.008

The emission intensity of phosphors is often subject to concentration quenching after doping of the activator in the host crystal rises above a certain limit. This study describes the preparation of novel phosphors based on tobermorite that do not exhibit concentration quenching. In the preparation of phosphors, Eu 3+ ions are exchanged with intercalated Ca 2+ ions within the tobermorite by dipping in EuCl 3 solution. The emission intensity of the Eu 3+ doped tobermorite increased with increasing Eu/Ca atomic ratio and attained a maximum value of 8.6% for a Eu/Ca atomic ratio of 0.22. Heating of the phosphor at 800 °C resulted in a three-fold improvement in emission intensity.