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A study of the luminescence properties of Eu~(3+)-doped borate crystal and glass

机译：Eu〜（3+）掺杂硼酸盐晶体和玻璃的发光性能研究

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摘要

Eu~(3+)-doped La_2O_3-3B_2O_3 crystal and glass were prepared by solid state reaction under different calcination temperature. The emission spectrum, phonon sideband (PSB), charge transfer band (C.T.B.) and lifetime of the Eu~(3+) ion in the two materials, with the same composition but with different phase, were investigated. With excitation at 394 nm light, the glass presented intense 618 nm red luminescence; however, the crystal gave 696 nm red luminescence. This difference is ascribed to the discrepancy of the local structure around the Eu~(3+) ion in the crystal and glass. To clarify the discrepancy, the coordination of Eu~(3+) in the borate glass and crystal was investigated. The results show that Eu~(3+) ions formed a complex Eu~(3+)-O~(2-)-B~(3+) bond in glass; however, in the crystal, it formed a complex Eu~(3+)-O~(2-)-La~(3+) bond. The lifetime of Eu~(3+) ions in the crystal and the glass is 3.08 ms and 1.98 ms, respectively. This indicates that the discrepancy in the local structure around the Eu~(3+) ions between the crystal and the glass leads to different fluorescence properties.
机译：在不同的煅烧温度下，通过固相反应制备了Eu〜（3+）掺杂的La_2O_3-3B_2O_3晶体和玻璃。研究了组成相同但相不同的两种材料中Eu〜（3+）离子的发射光谱，声子边带（PSB），电荷转移带（C.T.B.）和寿命。在394 nm的光激发下，玻璃呈现出618 nm的强烈红色发光。然而，晶体给出了696 nm的红色发光。这种差异归因于晶体和玻璃中Eu〜（3+）离子周围的局部结构的差异。为了澄清这一差异，研究了硼酸盐玻璃和晶体中Eu〜（3+）的配位。结果表明，Eu〜（3+）离子在玻璃中形成了复杂的Eu〜（3 +）-O〜（2-）-B〜（3+）键。然而，在晶体中，它形成了一个复杂的Eu〜（3 +）-O〜（2-）-La〜（3+）键。晶体和玻璃中Eu〜（3+）离子的寿命分别为3.08 ms和1.98 ms。这表明晶体和玻璃之间的Eu〜（3+）离子周围的局部结构差异导致不同的荧光性质。

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