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Cooperative Upconversion, Radiation Trapping, and Self-Quenching Effects in Highly Yb3 +-Doped Oxyfluoride Glasses

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In this work we report the successful preparation of fluorophosphate glasses in the new compositional line 20Al(PO3)3–10AlF3–25BaF2–25SrF2–(20 – x)YF3xYbF3 with x varying from 0 to 20 mol%, and their detailed spectroscopic investigation with respect to (non-) radiative decay processes. More precisely, we focus on the study of three important effects in Yb3+ doped systems, namely radiation trapping (RT), self quenching (SQ), and cooperative luminescence (CL). The characteristic improvement in hydrolytic stability and phonon energy of the glasses, as compared to phosphates, for example, result in long 2F5/2 radiative lifetime value (π0 = 1.2 ms) and high critical Yb3+ concentration (Q = 6.8 × 1020 ions/cm3). A very strong radiation trapping effect was observed in the investigated samples which can be favorably used to generate highly efficient energy upconversion in the blue, through Yb–Yb cooperative effect. The CL was investigated and quantified yielding, to the best of our knowledge, the highest CL parameter [k = (5.85 ± 0.08) × 10–18 cm3/s], which is associated to a CL rate of 32 s–1 for a typical pump power of ∼100 mW. These characteristics evidence the potential applications of the present YbM3+-doped oxyfluoride glasses for blue emitting devices, as well as for infrared ones.
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Keywords: COOPERATIVE UPCONVERSION; LASER MATERIALS; RADIATION TRAPPING; SELF QUENCHING

Document Type: Research Article

Publication date: December 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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