Proceedings Article | 16 March 2016
KEYWORDS: Glasses, Upconversion, Luminescence, Erbium, Absorption, Optical properties, Barium, Signal processing, Ions, Magnesium, Praseodymium, Infrared radiation, Visible radiation
In this report the optical properties and energy-transfer upconversion luminescence of Er3+- and Pr3+/Yb3+-codoped PbGeO3-PbF2-xF2(Mg, Ba) glass and glass-ceramic under infrared excitation at 975 nm is investigated. In Er3+/Yb3+- codoped samples, green(525, and 550 nm), and red(662 nm) luminescence corresponding to the 2H11/2→4I15/2, 4S3/2→4I15/2 e 4F9/2→4I15/2, respectively, was readily observed. In the Pr3+/Yb3+ co-doped system, emission peaks around 485, 530, 610, and 645 which were ascribed to the 3P0 - 3HJ (J=4,5,6), and 3P0 – 3FJ (J=2,3,4), transitions, respectively, were observed. The population of the praseodymium 3P0 emitting level was accomplished through a combination of ground-state absorption of Yb3+ ions at the 2F7/2, energy-transfer Yb3+(2F5/2) – Pr3+(3H4), and excited-state absorption of Pr3+ ions provoking the 1G4 – 3P0 transition. The dependence of the upconversion emission on glass composition, pump power, and doping contents was also examined. Glassy and glass-ceramic samples was compared in order determine the system with better luminescence efficiency.
