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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Dependence of upconversion emission intensity on Yb3+ concentration in Er3+/Yb3+ co-doped flake shaped Y-2(MoO4)(3) phosphors
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Dependence of upconversion emission intensity on Yb3+ concentration in Er3+/Yb3+ co-doped flake shaped Y-2(MoO4)(3) phosphors

机译：上转换发射强度对Er3 + / Yb3 +共掺杂片状Y-2（MoO4）（3）荧光粉中Yb3 +浓度的依赖性

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摘要

Yttrium molybdate phosphors with fixed Er3+ and various Yb3+ concentrations were synthesized via a co-precipitation method. The crystal structure and the morphology of the phosphor were characterized by means of x-ray diffraction and field-emission scanning electron microscopy. Under 980 nm excitation, red and green upconversion emissions centred at 660, 553 and 530 nm were observed. Quantitative analyses on the dependence of upconversion emission intensity on the working current of a laser diode (LD) indicated that two-photon processes are responsible for both red and green upconversion emissions in both cases of low and high Yb3+ concentrations. The relationship between the emission intensity ratio of H-2(11/2) -> I-4(15/2) to S-4(3/2) -> I-4(15/2) and the working current of the LD was studied for the samples doped with low and high Yb3+ concentrations. Finally, a set of rate equations was established based on the possible upconversion mechanism, and an empirical formula was proposed to describe the Yb3+ concentration dependence of upconversion emission intensity; the empirical formula fits well with the experimental data.
机译：通过共沉淀法合成了具有固定Er3 +和各种Yb3 +浓度的钼酸钇磷光体。通过X射线衍射和场发射扫描电子显微镜表征了磷光体的晶体结构和形态。在980 nm激发下，观察到红色和绿色上转换发射集中在660、553和530 nm处。对上转换发射强度与激光二极管（LD）的工作电流之间关系的定量分析表明，在低和高Yb3 +浓度的情况下，双光子过程都是红色和绿色上转换发射的原因。 H-2（11/2）-> I-4（15/2）对S-4（3/2）-> I-4（15/2）的发射强度比与工作电流之间的关系对LD进行了低浓度和高浓度Yb3 +掺杂样品的研究。最后，基于可能的上转换机理建立了一组速率方程，并提出了经验公式来描述上转换发射强度的Yb3 +浓度依赖性。经验公式与实验数据吻合良好。

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