Sol-gel preparation and photoluminescence properties of LiLa(MoO₄)₂:Eu³⁺ phosphors

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• 作者：Jinsheng Liao^a ; ^{jsliao1209@126.com} ; Hangying You^a ; ^b ; Dan Zhou^a ; He-rui Wen^a ; ^b ; Ruijin Hong^a
• 关键词：LiLa(MoO4)2 ; Phosphor ; Sol&ndash ; gel ; Luminescence
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：June, 2012
• 卷：34
• 期：8
• 页码：1468-1472
• 文件大小：612 K

摘要

LiLa(MoO₄)₂:Eu³⁺ (in brief LLM:Eu) phosphors have been prepared by sol-gel method. The properties of the resulting phosphors are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectra and decay curve. The excitation spectra of LLM:Eu phosphors are mainly attributed to O^{2鈭?/sup> 鈫?#xA0;Mo6+ charge-transfer (CT) band at about 280 nm and some sharp lines of Eu3+ f-f transitions in near-UV and visible regions with two strong peaks at 395 and 465 nm, respectively. The emission spectra were used to probe the local environments of Eu3+ ion in LLM crystal. Under the 395 nm excitation, intense red emission peaked at 616 nm corresponding to 5D₀ 鈫?#xA0;7F₂ transition of Eu3+ are observed for 55 at.%LLM:Eu phosphors as the optimal doping concentration. The luminescence indicates that the local symmetry of Eu3+ ion in LLM crystal lattice has no inversion center. The luminescence properties suggest that LLM:Eu phosphor may be regarded as a potential red phosphor candidate for near-UV light emitting diodes (LEDs).}