Upconversion for enlarging solar spectrum response in near-stoichiometric and congruent Er:LiNbO₃ crystals

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• 作者：Yannan Qian ; Biao Wang ; Rui Wang ; Senpei Gao ; Yingying Niu
• 关键词：Near-stoichiometric Er ; LiNbO3 ; Upconversion emission ; Structural characteristic
• 刊名：Optical Materials
• 出版年：March, 2014
• 年：2014
• 卷：36
• 期：5
• 页码：941-944
• 全文大小：537 K

文摘

To increase the photovoltaic efficiency of solar cell, the visible luminescence produced at the excitation of the near infrared laser light in near-stoichiometric and congruent LiNbO₃ crystals heavily doped with Er³⁺ ions (Er:NSLN and Er:CLN, respectively) were investigated. An enhancement of the green upconversion emission observed in Er:NSLN crystal was attributed to the inefficient cross relaxation processes of ²H_11/2 + ⁴I_13/2 鈫?#xA0;⁴I_11/2 + ⁴F_9/2 and ⁴F_7/2 + ⁴I_11/2 鈫?#xA0;⁴F_9/2 + ⁴F_9/2. The Er content in the crystal was measured by an inductively coupled plasma mass spectrometry (ICP-MS). The OH^{鈭?/sup> absorption and UV-vis-near infrared absorption spectra indicated that the Er3+ cluster sites were dissociated in Er:NSLN crystal. The strong green upconversion emission produced by Er:NSLN crystal will be beneficial for improving the practical performance of solar cells.}