Spectroscopic properties of red emitting Eu³⁺ doped Y₂SiO₅ nanophosphors for WLED׳s on the basis of Judd-Ofelt analysis: Calotropis gigantea latex mediated synthesis

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• 作者：G. Ramakrishna^a ; H. Nagabhushana^b ; ^{bhushanvlc@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; B. Daruka Prasad^c ; Y.S. Vidya^d ; S.C. Sharma^e ; K.S. Anantharaju^f ; S.C. Prashantha^g ; Nityanand Choudhary^h
• 关键词：Calotropis gigantea ; Y2SiO5 ; Eu3+ ; Optical properties ; Judd&ndash ; Ofelt analysis ; Green mediated synthesis
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：181
• 期：Complete
• 页码：153-163
• 全文大小：4419 K

文摘

A series of Eu³⁺ (1–7 mol %) doped Y₂SiO₅ red nanophosphors were prepared by eco-friendly combustion route using Calotropis gigantea latex as a fuel. The obtained nanophosphors were calcined at 1000 °C and characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman studies, UV–Visible and photoluminescence (PL) spectroscopic techniques. PXRD were used to determine the structure of the phosphors, showing that the product was monoclinic phase of X1 type Y₂SiO₅ having a phase group P2_1/c n. 14. The PL properties of samples exhibited an intense broad red emission band upon excitation with 397 nm, with a peak at 612 nm, color coordinates of (0.5866, 0.4026), and average correlated color temperature ~2018.5 K. Based on Judd–Ofelt (J–O) theory, the intensity parameters (Ω₂ and Ω₄) were evaluated from the emission spectra of Y₂SiO₅: Eu³⁺ (1–7 mol %) nanophosphors. The registered trend (Ω₂<Ω₄) reveals the relatively high symmetry environment around the rare earth ion (RE) site in Y₂SiO₅ as compared to other host matrix. The results show that prepared samples were compared with the commercially available compound and founds as par to the commercial compound hence it may be used as a potential red phosphors for near UV excited White LEDs applications.