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首页> 外文期刊>RSC Advances >Upconversion luminescence enhancement and temperature sensing behavior of F? co-doped Ba3Lu4O9:Er3+/Yb3+ phosphors
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Upconversion luminescence enhancement and temperature sensing behavior of F? co-doped Ba3Lu4O9:Er3+/Yb3+ phosphors

机译：F ？共掺杂的Ba 3 Lu 4 O 9 ：Er <的上转换发光增强和温度传感行为sup> 3 + / Yb 3 + 荧光粉

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A series of Ba3Lu4O9:Er3+/Yb3+ (EYBLO) phosphors co-doped with F? ions were synthesized by a simple solid-state reaction method. The results showed that the primary rhombohedral structure was maintained and the crystal lattice began to shrink when F? ions were introduced into the host matrix to occupy the O2? site. The agglomerations and the impurities (OH? and CO2) with higher phonon energy on the sample surface could be minimized and the sample crystallinity could be improved. Under 980 nm laser diode excitation, the green and red UC emissions of the EYBLO:0.4F? sample show nearly 5- and 7.5-fold enhancements in contrast to F?-free EYBLO. The upconversion luminescence can be finely tuned from yellow to red light to some extent by increasing F? concentration. Based on pump-power dependence and decay lifetime analysis, the energy level diagram was illustrated and the upconversion energy-transfer mechanism was discussed. The green and red emission enhancements are attributed to the modification of the local crystal field of Er3+ ions and reduction of crystal site symmetry. The cross-relaxation and back-energy-transfer processes play an important role to enhance the red/green UC emission intensity ratios. The fluorescence intensity ratio technique was employed to investigate the temperature sensing behavior of the synthesized phosphors. The temperature sensing properties can be enhanced by doping of F? ions, and the maximum sensitivity is found to be 44.57 × 10?4 K?1 at 523 K. It is promising to provide an alternative approach for enhancing UC luminescence and the temperature sensitivity in oxide matrixes and then obtain high-quality optical temperature-sensing materials by simply co-doping F? ions.
机译：一系列Ba 3 Lu 4 O 9 ：Er 3 + / Yb 3 + （EYBLO）荧光粉与F <通过简单的固态反应方法合成了sup>？ 离子。结果表明，当F ？ 离子引入主体基质并占据O 2？ 网站。样品表面上具有较高声子能的团聚和杂质（OH ？ 和CO 2 ）可能是最小化并且可以改善样品的结晶度。在980 nm激光二极管激发下，EYBLO：0.4F ？ 样品的绿色和红色UC发射比F ？ -免费的EYBLO。通过增加F ？ 浓度，可以在某种程度上将上转换发光从黄光微调到红光。基于泵浦功率相关性和衰减寿命分析，给出了能级图，并讨论了上转换能量传递机理。绿色和红色发射增强归因于Er 3 + 离子的局部晶体场的修饰和晶体位点对称性的降低。交叉松弛和背能量转移过程在提高红色/绿色UC发射强度比方面起着重要作用。采用荧光强度比技术研究了合成荧光粉的温度传感行为。通过掺杂F ？ 离子可以增强温度感应性能，发现最大灵敏度为44.57×10 ？4 K ？1 在523K。有望为增强UC发光和氧化物基质中的温度敏感性提供一种替代方法，从而获得高-通过简单地共掺杂F ？ 离子获得高质量的光学温度传感材料。

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