Preparation and characterization of a new long afterglow indigo phosphor Ca_(12)Al_(14)O_(33):Nd, Eu

摘要

A new phosphor Ca_(12)Al_(14)O_(33):Nd, Eu was synthesized by a traditional solid-state reaction method and the luminescent properties were investigated. The phosphors are well crystallized by calcination at 1200℃. The excitation and the emission spectra show the characteristic broadband of the Eu~(2+) ion and the emission light is indigo. Doping Nd~(3+) ion in the phosphor results in indigo long afterglow phosphorescence (the time for the phosphorescence intensity to decrease to 10% of its initial value is about 50 s) when the excitation light is cut off. The emission intensity decreases with the increase of Nd~(3+) ion concentration. Whereas, the phosphorescence intensity and afterglow time improve when the concentration of Nd~(3+) ion increases.