Anion- and cation-type energy transfer in BaF 2: Dy

Abstract

BaF 2: Dy 3+-luminescence was investigated as a function of Dy-concentration (0–1 mol%), excitation energy (5–40 eV), and temperature (8–640 K). Cross luminescence (CRL), STE emission, and several Dy 3+ lines were observed. Dy 3+ can be excited in the transparency range of BaF 2 and via BaF 2 → Dy 3+ energy transfer following band-to-band transitions. Energy transfer is weak at low temperatures. Around 300 K, it competes with thermal quenching of STEs.