Luminescence Properties of SrZrO3/Tb3+ Perovskite: Host-Dopant Energy-Transfer Dynamics and Local Structure of Tb3+

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• 作者：Santosh Kumar Gupta ; Partha Sarathi Ghosh ; Ashok Kumar Yadav ; Nimai Pathak ; Ashok Arya ; Shambhu Nath Jha ; Dibyendu Bhattacharyya ; Ramakant Mahadeo Kadam
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：February 15, 2016
• 年：2016
• 卷：55
• 期：4
• 页码：1728-1740
• 全文大小：788K
• ISSN：1520-510X

文摘

SrZrO₃ perovskite (SZP) was synthesized using gel-combustion route and characterized systematically using X-ray diffraction and time-resolved photoluminescence techniques. A detailed analysis of the optical properties of Tb³⁺ ions in SrZrO₃ was performed to correlate them with the local environment of the lanthanide ions in this perovskite. Photoluminescence (PL) spectroscopy showed that emission spectrum consists of host as well as Tb³⁺ emission indicating the absence of complete host-dopant energy transfer. On the basis of emission spectrum and PL decay study it was also observed that Tb³⁺ is not homogeneously distributed in SrZrO₃ perovskite; rather, it is occupying two different sites. It is corroborated using extended X-ray absorption fine structure studies that Tb³⁺ is stabilized on both six-coordinated Zr⁴⁺ and eight-coordinated Sr² site. The energies calculated using density functional theory (DFT) indicates that Tb occupation in Sr site is energetically more favorable than Zr site. The analysis of valence charge distribution also substantiated our structural stability analysis of site-selective Tb doping in SrZrO₃. Time-resolved emission spectroscopy is employed to elucidate the difference in the spectral feature of Tb³⁺ ion at Sr²⁺ and Zr⁴⁺ site. DFT-calculated density of states analysis showed that energy mismatch of Tb-d states with Zr-d and O-p states of SZP makes the energy transfer from host SZP to Tb³⁺ ion difficult.