Red-emission properties and crystallization behavior in Eu2O3-TeO2 glasses.

Abstract Transparent glass of x Eu 2 O 3 -(100- x)TeO 2 binary system is obtained by using the melt-quenching method and especially studied for x = 5 in x Eu 2 O 3 -(100- x)TeO 2 composition. Optical properties such as transmission, excitation, and emission spectra of Eu 2 O 3 -TeO 2 glass-ceramics are studied and carefully compared for the samples heated at different temperatures. The one step heat-treatment affects the crystallinities as well as phase formation and yields cubic [Eu 2 Te 6 O 15 ], orthorhombic [TeO 2 ], and tetragonal [TeO 2 ] phases depending on the heat treating temperature. Glass-ceramics of Eu3+-doped tetragonal [TeO 2 ] shows stronger emission intensity at wavelength of 613 nm with an excitation wavelength of 394 nm compared with that from cubic [Eu 2 Te 6 O 15 ] or Eu3+-doped orthorhombic [TeO 2 ]. Enhancement of emission intensity in Eu3+-doped tetragonal [TeO 2 ] is related to the local environment of Eu3+ ions substituted in tetragonal TeO 2 lattice. Highlights • Transparent 5Eu 2 O 3 -95TeO 2 binary glass is obtained by using the melt-quenching method • Phase formation cubic [Eu 2 Te 6 O 15 ], orthorhombic [TeO 2 ], and tetragonal [TeO 2 ] phases with temperature is observed • Stronger emission intensity at wavelength of 613 nm with an excitation wavelength of 394 nm was observed • Enhancement of emission intensity is related to the local environment of Eu3+ substituted in tetragonal TeO 2 lattice. [ABSTRACT FROM AUTHOR]