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Synthesis and luminescence study of Eu~(3+) in Zn_2SiO_4 nanocrystals

机译:Zn_2SiO_4纳米晶体中Eu〜(3+)的合成与发光研究

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The sol-emulsion-gel method is used for the preparation of Eu~(3+) doped Zn_2SiO_4 nanoparticles. The luminescence spectra at 613 nm (~5D_0→~7F_2) and lifetime of the excited state of Eu~(3+) ions doped Zn_2SiO_4 nanocrystals are also found to be sensitive to the concentration (0.25-2.5 mol%) of ions. In case of 1000℃ annealed sample (0.25 mol% Eu~(3+)) showed the single component decay of 2.02 ms. However, with increasing the concentration the decay is biexponential. We attribute this to an inter-ion exchange interaction wherein the more rapid decay is due to pair or cluster formation and the longer-lived emission originates from isolated ions within the insulating host.
机译:采用溶胶-凝胶法制备了Eu〜(3+)掺杂的Zn_2SiO_4纳米粒子。还发现Eu〜(3+)离子掺杂的Zn_2SiO_4纳米晶体在613 nm(〜5D_0→〜7F_2)处的发光光谱和激发态的寿命对离子的浓度(0.25-2.5 mol%)敏感。在1000℃退火的情况下(0.25 mol%Eu〜(3+)),单组分衰减为2.02 ms。但是,随着浓度的增加,衰减是双指数的。我们将其归因于离子间交换相互作用,其中更快的衰变归因于成对或簇的形成,寿命更长的发射源于绝缘主体内的离析离子。

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