Abstract
Detailed optical properties of Tb3+-Yb3+ co-doped phosphate glasses were performed based on their emission spectra and decay measurements. Under blue excitation of Tb3+ at 488 nm, the intensity of Yb3+ emissions gradually enhanced upon increasing the Yb3+ content until 1 mol% indicated an energy transfer from Tb3+ to Yb3+. Otherwise, under near infrared excitation of Yb3+ at 980 nm, these glasses exhibit intense green luminescence, which led to cooperative sensitization of the 5D4 level of Tb3+ ions. A cooperative energy transfer mechanism was proposed on the basis of the study on the influence of Yb3+ concentration on up-conversion emission intensity, as well as the dependence of this up-conversion intensity on near infrared excitation power. Moreover, the temporal evolution of the up-conversion emissions have been studied, which was in positive agreement with a theoretical model of cooperative up-conversion luminescence that showed a temporal emission curve with rise and decay times of the involved levels.
Highlights
Over the past few decades, great attention has been given to synthesize new luminescent materials activated by lanthanide ions, which allows for efficient energy conversion in different materials
Numerous works devoted to down-conversion processes have been reported, such as Ce3+ -Yb3+, Nd3+ -Yb3+ [11], Pr3+ -Yb3+ [12], and Tb3+ -Yb3+ [13]
The Tb3+ ions can be excited by a cooperative energy transfer from two Yb3+ ions [15,16], and realizing an up-conversion process that involves two photons from the near infrared range that are converted to a photon with a higher energy
Summary
Over the past few decades, great attention has been given to synthesize new luminescent materials activated by lanthanide ions, which allows for efficient energy conversion in different materials. Ions act as an energy acceptor in order to emit near infrared photons and achieve spectral conversion due to their electronic configuration. The phosphate glass is an attractive host material because of its low melting allowance of a high concentration of rare earth ions doping; as such, it could be an exceltemperature and excellent chemical stability, as well as its high ultraviolet transmission lent down- and up- conversion luminescence matrix material. The present work and allowance of a high concentration of rare earth ions doping; as such, it could be focuses on the energy transfer processes between Yb3+ and Tb3+ analyzing on the photoluan excellent down- and up- conversion luminescence matrix material. On the photoluminescence and the temporal luminescence curves in order to identify the involved mechanisms
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