Structure and luminescence of SrY2O4 : Eu

Powder samples of SrY2(1-x)O4:Eu-2x were prepared at 1000 degrees C by the combustion method. The emission spectrum of SrY2O4:Eu3+ showed two kinds of Eu3+ emissions, which could be assigned to Eu3+ ions in the Sr site and th e Y site. Reducing SrY2O4:Eu brought a broad band emission around 470 nm, w hich could be attributed to crystal defects introduced by the reduction. Th e energy transfer from defects to Eu3+ ions was observed to be more effecti ve to the Sr site than to the Y site. (C) 1999 The Electrochemical Society. S0013-4651(99)01-037-X. All rights reserved.