Enhanced red emission of NaSrVO₄:Eu³⁺ phosphor via Bi³⁺co-doping for the application to white LEDs

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• 作者：Yu Zeng^a ; Kehui Qiu^b ; ^{15884599896@163.com" class="auth_mail" title="E-mail the corresponding author} ; ^{qkh2188@163.com" class="auth_mail" title="E-mail the corresponding author} ; Ziqi Yang^a ; Yunlei Bu^a ; Wentao Zhang^a ; Junfeng Li^a
• 关键词：White LEDs ; NaSrVO4 ; Eu3+ ; Bi3+ ; Red emitting phosphors ; Luminescence properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：830-834
• 全文大小：1038 K

文摘

A series of NaSrVO₄:Eu³⁺ and NaSrVO₄:Eu³⁺, Bi³⁺ phosphors were synthesized by the combustion method fueled by citric acid. The structure and photoluminescence properties of the phosphors were examined by X-ray powder diffraction (XRD) scanning electron microscope (SEM) and photoluminescence spectroscopy (PL). The samples are well crystallized in the monoclinic phase with the P2_1/n space group. According to the photoluminescence spectra, the phosphors are efficiently excited by near-UV light and exhibited a bright red emission centered at ~625 nm. The photoluminescence intensities of the NaSrVO₄:Eu³⁺, Bi³⁺ phosphors are significantly enhanced by the efficient energy transfer between Bi³⁺ and Eu³⁺. The emission intensity of NaSrVO₄ is maximized by co-doping with 15 mol% Eu³⁺ and 3 mol% Bi³⁺. The sensitization mechanism was also deduced from energy level diagrams of the Eu³⁺ and Bi³⁺ ions.