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首页> 外文期刊>RSC Advances >Mechanistic investigation on up and down conversion of Er3+ and Gd3+ co-doped YTiNbO6 phosphors
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Mechanistic investigation on up and down conversion of Er3+ and Gd3+ co-doped YTiNbO6 phosphors

机译：Er3 +和Gd3 +共掺杂YTiNbO6荧光粉上下转换的机理研究

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摘要

YTiNbO6 phosphors doped with Er3+, Gd3+ were synthesized via a facile sol-gel and combustion approach. The crystal structure and particle morphology were characterized and the phonon energy was investigated in detail. The up-conversion emission excited at 980 nm and down-conversion emission excited at 378 nm of Er3+ with different concentrations were analysed. They both have strong green emission peaks at 522 and 552 nm but the red emission peak at 668 nm only appears in the up-conversion. Furthermore, the Er3+ quenching concentration for up-conversion is higher than that for down-conversion because the up-conversion is a complex multiple stepwise process which includes energy transfer, phonon-assisted energy transfer and excited state absorption that can cover a wider range of Er3+ doping concentrations. Moreover, the influence of co-doped Gd3+ on the morphology and particle size was also explored. Gd3+ had a great effect on the up and down conversion emission intensity as well as the decay time of up-conversion by changing the structure distortion, vibration frequencies and surface defects.
机译：掺入了Er3 +，Gd3 +的YTiNbO6荧光粉通过溶胶-凝胶和燃烧方法合成。表征了晶体结构和粒子形态，并详细研究了声子能量。分析了不同浓度的Er3 +在980 nm激发的上转换发射和378 nm激发的下转换发射。它们都在522和552 nm处有很强的绿色发射峰，但在668 nm处只有在上转换中出现红色发射峰。此外，上转换的Er3 +猝灭浓度高于下转换，因为上转换是一个复杂的多步过程，包括能量转移，声子辅助能量转移和激发态吸收，可以覆盖更宽的范围。 Er3 +掺杂浓度。此外，还探讨了共掺杂的Gd3 +对形貌和粒径的影响。 Gd3 +通过改变结构畸变，振动频率和表面缺陷，对上下转换发射强度以及上转换的衰减时间有很大影响。

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