Wide-Band Excited YTiTaO6: Eu3+/Er3+ Phosphors: Structure Refinement, Luminescence Properties, and Energy Transfer Mechanisms

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• 作者：Yang Zhang ; Dongling Geng ; Xuejiao Li ; Jian Fan ; Kai Li ; Hongzhou Lian ; Mengmeng Shang ; Jun Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 7, 2014
• 年：2014
• 卷：118
• 期：31
• 页码：17983-17991
• 全文大小：718K
• ISSN：1932-7455

文摘

Eu³⁺-/Er³⁺-activated YTiTaO₆ phosphors have been prepared via conventional solid state reaction process. X-ray diffraction (XRD) and structure refinement, Raman spectra, X-ray photoelectron Spectrum (XPS), photoluminescence (PL) spectra, cathodoluminescence (CL) spectra, and lifetimes were utilized to characterize the synthesized samples. Under UV light excitation, the YTiTaO₆ sample shows broad band emission centered near 505 nm due to the Ta(Ti)O₆ polyhedron. Eu³⁺ and Er³⁺ ions doped YTiTaO₆ samples show strong line emissions coming from the characteristic f鈥揻 transitions. The energy transfer from the Ta(Ti)O₆ group of the host to Eu³⁺ and Er³⁺ in YTiTaO₆ phosphors has been demonstrated to be a resonant type via a dipole鈥揹ipole mechanism, and the critical distance (R_C) for host emission to Eu³⁺ and Er³⁺ calculated by concentration quenching method are 10.02 and 18.86 脜, respectively. Under the low voltage electron beam excitation, the CL spectra of YTiTaO₆, YTiTaO₆: Eu³⁺, and YTiTaO₆: Er³⁺ samples are similar to their PL spectra, exhibiting bluish-green, red, and green luminescence, respectively, which indicates that these materials might be promising for application in solid-state lighting and field-emission displays.