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首页> 外文期刊>RSC Advances >Enhanced anti-stocks luminescence in LaNbO4:Ln3+ (Ln3+ = Yb3+, Er3+/Ho3+/Tm3+) with abundant color
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Enhanced anti-stocks luminescence in LaNbO4:Ln3+ (Ln3+ = Yb3+, Er3+/Ho3+/Tm3+) with abundant color

机译：LaNbO 4 ：Ln 3 + （Ln 3 + = Yb 3 + ，Er 3 + / Ho 3 + / Tm 3 + ），色彩丰富

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Lanthanide ion doped up-conversion luminescent (UCL) materials, which have the ability to convert near-infrared longer wavelength excitation light into shorter wavelength visible light, have recently drawn much attention. Now, a series of Ln3+ (Yb3+, Er3+/Ho3+/Tm3+) ions doped LaNbO4 (LNO) materials were prepared through a two-step route, including a facile sol–gel process and subsequent combustion. In our work, thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), up-conversion luminescence (UCL), energy level diagram, luminescent lifetimes and corresponding CIE were utilized to characterize the properties. A 980 nm laser was employed to excite Yb3+ ions to achieve the 2F7/2 → 2F5/2 transition, and the LNO:Yb3+,Er3+/Ho3+/Tm3+ samples exhibited intense green, yellowish-green and blue emission, respectively. Luminescent spectra at different powers demonstrated the two-photon absorption process; meanwhile, the corresponding energy transfer mechanisms from Yb3+ to Ln3+ and the emissions of Ln3+ under 980 nm laser excitation were described via an energy level diagram. Moreover, multicolor UCL emissions, the optimal intensities and corresponding mechanism were systematically explored via a suite of concentration spectra of different Ln3+ ions. At last, the decay lifetimes based on the concentration variation of Yb3+ ion demonstrated that the lifetimes are heavily influenced by Yb3+ ion.
机译：镧系元素离子掺杂的上转换发光（UCL）材料具有将近红外较长波长的激发光转换为较短波长的可见光的能力，最近备受关注。现在，一系列Ln 3 + （Yb 3 + ，Er 3+ / Ho 3 + / Tm 3 + ）离子掺杂的LaNbO 4 （LNO）材料是通过两步路线制备的，包括简便的溶胶-凝胶工艺和随后的燃烧。在我们的工作中，热重分析和差热分析（​​TG-DTA），X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM），上转换发光（UCL），能级图，发光寿命及相应的利用CIE来表征性质。使用980 nm激光激发Yb 3 + 离子以实现 2 F 7/2 → 2 F 5/2 过渡，然后LNO：Yb 3 + ，Er 3 + / Ho 3 + / Tm 3 + 样品分别显示出强烈的绿色，黄绿色和蓝色发光。不同功率的发光光谱证明了双光子吸收过程。同时，从Yb 3 + 到Ln 3 + 的相应能量传递机制以及Ln 3 + 。此外，通过一套不同的Ln 3 + 离子的浓度谱，系统地研究了多色UCL的发射，最佳强度和相应的机理。最后，基于Yb 3 + 离子浓度变化的衰变寿命表明，寿命受Yb 3 + 离子。

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