Blue-red emitting BaAlb>xb>Ob>yb>:Eu²⁺,Dy³⁺ nanophosphors synthesized using solution-combustion method: The effect of boric acid

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• 作者：Francis B. Dejene ; Moges Tsega ; ^{mogestsega@yahoo.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：BaAlxOy ; Eu2+ ; Dy3+ ; Solution-combustion ; Boric acid ; Luminescence
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：127
• 期：4
• 页码：1975-1979
• 全文大小：1584 K

文摘

Polycrystalline blue-red luminescent BaAlb>xb>Ob>yb>:Eu²⁺,Dy³⁺ phosphor powders were prepared by solution-combustion method at 500 °C for 5–6 min. Effect of boric acid (Hb>3b>BOb>3b>) on structure, morphology and luminescence properties of blue-red phosphors BaAlb>xb>Ob>yb>:Eu²⁺,Dy³⁺ was investigated. XRD pattern confirms that the crystal structure of synthesized sample changes from hexagonal to tetragonal phase and the crystallites size was found to be 39–53 nm range with boric acid concentration. The emission spectra showed that the phosphors prepared without boric acid has a main peak at 505 nm, while those with boric acid have a triple main peak at 480, 580 and 615 nm, correspond to the 5d → 4f transitions of Eu²⁺ ions. The results indicated that the main peak in the emission and excitation spectrum of phosphor nanoparticles with boric acid shifted to the short wavelength compare with the phosphor without boric acid. The red-emission intensity at 615 nm and afterglow properties are enhanced by Hb>3b>BOb>3b> at 2 mol%, then decreased at higher concentrations attributable to concentration-quenching effect.