ERBIUM-CONTAINING PEROVSKITE-TYPE LUMINESCENT CRYSTAL AND ITS PRODUCTION

摘要

PURPOSE: To obtain the subject crystal excellent in luminescent intensity, etc., by mixing a carbonate of an alkaline earth metal ion with two specified oxides of rare earth metal ions and an oxide of aluminum in a specified mixing ratio, melting the resulting mixture, and solidifying the melt. ;CONSTITUTION: A carbonate or oxide (A) of an alkaline earth metal ion selected between Ca₂₊ and Sr²⁺ (e.g. CaCO₃), an oxide (B) of Er³⁺ (e.g. Er₂O₃), an oxide (C) of a rare earth metal ion selected between Gd³⁺ and La³⁺ (e.g. Gd₂O₃), and an oxide (D) of Al (e.g. Al₂O₃) are mixed together in an atomic ratio, ions of component A/Er/ions of component C/Al ions, of 1:x:(1-x):1 (wherein 0.001≤x≤0.2). The resulting mixture is molten in an atmosphere of an inert gas or an oxidizing gas, and the melt is solidified to obtain a perovskite-type luminescent crystal of the formula (wherein A is Ca²⁺ or Sr²⁺; B is Er³⁺; and Ln is Gd³⁺ or La³⁺).;COPYRIGHT: (C)1993,JPO&Japio