Photoluminescence enhancement and energy transfer mechanism of Bismuth added LaGaO₃: Eu nanophosphor for display applications

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• 作者：T. Samuel ; Ch. Satya Kamal ; K. Sujatha ; V. Veeraiah¹ ; Y. Ramakrishana² ; K.Ramachandra Rao ; ^{drkrcr@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; ^{drkpati.rc@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanophosphors ; Polyol synthesis ; Bi and Eu co-doped lanthanum gallate ; Photoluminescence ; Energy transfer
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：127
• 期：22
• 页码：10575-10587
• 全文大小：2630 K

文摘

A systematic investigations were carried out on pure LaGaO₃, Bi³⁺ doped-LaGaO₃, Eu³⁺doped-LaGaO₃, Bi³⁺ and Eu³⁺ co-doped LaGaO₃ (LaGaO₃:Bi³⁺, Eu³⁺) nanophosphors synthesized by low temperature polyol technique for enhanced luminescent properties. Powder x-ray diffraction (PXRD), UV⿿vis spectroscopy, FTIR, and FE-SEM with EDAX measurements were done for the phase identification, energy band gaps, functional group analysis and structural morphology and elemental presence respectively. Photoluminescence (PL) spectra of prepared nanophosphors under near-UV light exhibited a red luminescence corresponding to the electric dipole transition ⁵D₀-⁷F₂ at 616 nm. The enhanced PL intensity was observed in LaGaO₃:Bi^3+, Eu3⁺ nanophosphor due to strong absorption of excitation energy and effective energy transfer mechanism in between the dopants. The corresponding decay curve was observed with a long life time of 2.13 ms. The obtained CIE data indicates these nanophoshors serve as potential candidates for display device industry.