Method for producing an yttrium oxysulfide fluorescent material.

摘要

A method for producing a yttrium oxysulfide fluorescent material is described. In the method, a starting composition is provided which comprises yttrium oxide, a flux of sodium carbonate and sulfur, which are, respectively, added in amounts by mole of at least from 2 to 10 times and from 4 to 20 times an amount of the yttrium oxide. The molar ratio of the sodium carbonate to the sulfur is in the range of from 0.2:1 to 1.25:1. The composition is sintered at a temperature sufficient to provide a small-sized powder of yttrium oxysulfide fluorescent material. This temperature is in a range of 900 DEG C to 1100 DEG C.