Journal
JOURNAL OF LUMINESCENCE
Volume 105, Issue 2-4, Pages 121-126Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-2313(03)00117-0
Keywords
surfaces; phosphors; sulfides
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An investigation is reported on the coating of the alkaline earth sulfide based red emitting phosphor Ca0.8Sr0.2S:Eu2+, Tm3+ by a thin layer of SiO2 or TiO2 using the sol-gel process. Their alkoxides were used as precursors and were dissolved in an aqueous ethanol medium. EDX (energy dispersive X-ray), SEM (scanning electron microscopy) and powder XRD (X-ray diffraction) were used to characterize the coating. The properties of coated phosphors were also tested; resistances of coated phosphors to moisture and other atmospheric components have been enhanced to a great degree without more loss of their optical properties. When the ratio of oxide ranges from 2% to 5% in weight, the brightness of phosphor has no remarkable change but the stability has been improved greatly. (C) 2003 Elsevier B.V. All rights reserved.
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