Downconversion in Y₂Si₂O₇: Pr³⁺, Yb³⁺ polymorphs for its possible application as luminescent concentrators in photovoltaic solar-cells

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• 作者：K. Grzeszkiewicz ; ^{k.grzeszkiewicz@int.pan.wroc.pl" class="auth_mail" title="E-mail the corresponding author} ; L. Marciniak ; W. Stręk ; D. Hreniak
• 关键词：Downconversion ; Y2Si2O7 ; Quantum Cutting ; Pr3+ ; Yb3+
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：177
• 期：Complete
• 页码：172-177
• 全文大小：1475 K

文摘

Polycrystalline powders α and β phases of Y₂Si₂O₇ (yttrium disilicate) co-doped with Pr³⁺, Yb³⁺ ions have been prepared by the sol–gel method. The structural phase purity of obtained silicates has been confirmed by XRD measurements. The possible Pr³⁺→Yb³⁺ energy transfer mechanisms were analyzed in a function of Yb³⁺ concentration for both phases of Y₂Si₂O₇. It was proven that the probability of downconversion (DC) process is strongly dependent on excitation power and Yb³⁺ concentration. From the power dependence of emission intensity analysis it was found that for low excitation power regimes DC process is responsible for Pr³⁺→Yb³⁺ energy transfer while above threshold power a cross relaxation process becomes dominant.