Sol-gel preparation and photoluminescence properties of tetragonal ZrO₂:Y³⁺, Eu³⁺ nanophosphors

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• 作者：Jinsheng Liao ; Dan Zhou ; Bin Yang ; ^{binyang65@126.com} ; Ruiqing Liu ; Qian Zhang
• 关键词：ZrO2 ; Phosphor ; Sol&ndash ; gel ; Luminescence ; Tetragonal
• 刊名：Optical Materials
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：35
• 期：2
• 页码：274-279
• 全文大小：755 K

文摘

By controlling Eu³⁺ doping concentration, ZrO₂:Y³⁺, Eu³⁺ (YSZ:Eu) nanophosphors with tetragonal structure have been prepared by sol-gel method. The properties of the resulting phosphors are characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), photoluminescence (PL) spectra and decay curve. The excitation spectra of YSZ:Eu phosphors are mainly attributed to O^2- ¡ú Eu³⁺ charge-transfer (CT) band at about 254 nm and some sharp lines of Eu³⁺ f-f transitions in near-UV region with one strong peak at 395 nm. The emission spectra were used to probe the local environments of Eu³⁺ ion in ZrO₂ crystal. Based on the high-resolution emission and excitation spectra at 10 K, it is identified that the lattice site of Eu³⁺ in tetragonal ZrO₂ nanocrystals descending from D_4h to approximate C_2V as a result of the lattice distortion. Under the 395 nm excitation, intense red emission peaked at 607 nm corresponding to ⁵D₀ ¡ú ⁷F₂ transition of Eu³⁺ is observed for 6 at. % YSZ:Eu phosphors as the optimal doping concentration. The luminescence properties suggest that YSZ:Eu phosphor may be regarded as a potential red phosphor candidate for near-UV light emitting diodes (LEDs).