Preparation and Luminescent Properties of Ti-Activated Zirconia

Abstract

Very pure monoclinic prepared from recrystallized zirconium oxy‐chloride and activated with 0.08% Ti4+ responds well to 2537Aå and cathode‐ray excitation. A room temperature quantum efficiency of 70%, relative to , has been attained with 2537Aå excitation. The emission band extends from below 4000 to above 6500Aå, peaking at 4800Aå. The phosphor has a broad excitation spectrum and responds almost equally well to wavelengths between 2100 and 2600Aå. At 20°C the response to 2537Aå excitation is about 82% of the maximum response which occurs at about −60°C. The initial decay is exponential with rate constant , but the visually detectable persistence lasts several minutes. The long persistence is associated with glow peaks which were found to exist above 20°C. Additional stronger glow peaks occur at lower temperatures.