ChemInform Abstract: Sol—Gel Processing of BaMgF₄—Eu²⁺ Thin Films and Their Violet Luminescence.

Abstract

2002 luminescence, fluorescence luminescence, fluorescence (solids and liquids) D 6540 -011Sol-Gel Processing of BaMgF 4 -Eu 2+ Thin Films and Their Violet Luminescence.-Thin films of the title compound are prepared by a sol-gel method from isopropanol solutions of Ba(OAc) 2 , Mg(OAc) 2 ·4H 2 O, Eu(OAc) 3 ·4H 2 O, CF 3 COOH, and H 2 O (20 • C, 2 h, followed by spin coating and heating at 500-700 • C for 10 min). The reduction of Eu 3+ to Eu 2+ in the heat-treated films is evidenced by the strong, broadband 4f-5d excitation at 290 nm and emission at 420 nm in photoluminescence measurements. The intensity of the violet luminescence of Eu 2+ depends on the heating temperature, heating time, and Eu concentration. The strongest violet emission is observed for the BaMgF 4 :Eu (15 mol%) thin film heated at 650 • C for 10 min.