Formation Process of a Red Phosphor, Y2O2S : Eu3+

摘要

Yttrium oxysulfide incoporated with europium has been prepared by direct heating the mixture of Y2O3, Eu2O3, NaOH(or Na2CO3), and S. The reaction of the mixture at low temperatures and treatment at higher temperatures are studied. The formation of Y2O2S is completed at lower temperature (ca. 500∩) and incorporation of Eu3+ into Y2O2S lattice proceeds at higher temperature (above 1000∩) along with crystal growth. Small amount of the unknown phase considered to be Y2O2S2 is formed along with Y2O2S in the temperature range from 400∩ to 460∩.