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首页> 外文期刊>Solid state sciences >Vacuum ultraviolet spectroscopic properties of rare earth (RE) (RE = Eu, Tb, Dy, Sm, Tm)-doped K_2GdZr(PO_4)_3 phosphate
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Vacuum ultraviolet spectroscopic properties of rare earth (RE) (RE = Eu, Tb, Dy, Sm, Tm)-doped K_2GdZr(PO_4)_3 phosphate

机译：稀土（RE）（RE = Eu，Tb，Dy，Sm，Tm）掺杂的K_2GdZr（PO_4）_3磷酸盐的真空紫外光谱性质

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摘要

The luminescent characteristics of RE (RE~(3+) = Eu, Tb, Dy, Sm and Tm)-doped K_2GdZr(PO_4)_3 have been investigated. The band in the range of 130-157 nm in the VUV excitation spectra of these compounds is attributed to the host lattice or PO_4~(3-) group absorption and the band from 157 nm to 215 nm with the maximum at 188 nm is due to the O-Zr charge transfer transition. For Eu~(3+)-doped sample, the relatively weak band of O~(2-)-Eu~(3+) charge transfer (CTB) at 222 nm is observed and for Tb~(3+)-doped sample, the band at 223 nm is related to the 4f-5d spin-allowed transition of Tb~(3+). For Dy~(3+)- and Sm~(3+)-doped samples, the O~(2-)-Dy~(3+) and O~(2-)-Sm~(3+) CTBs have not been observed, probably due to the 2p electrons of oxygen tightly bound to the zirconium ion in the host lattice. In Tm~(3+)-doped sample, the weak O~(2-) -Tm~(3+) CTB is located at 170 nm. It is observed that there is energy transfer between the host and the luminescent activators (e.g. Eu~(3+), Tb~(3+) and Sm~(3+)) except for Tm~(3+).
机译：研究了稀土（RE〜（3+）= Eu，Tb，Dy，Sm和Tm）掺杂的K_2GdZr（PO_4）_3的发光特性。这些化合物在VUV激发光谱中在130-157 nm范围内的谱带归因于主体晶格或PO_4〜（3-）基团吸收，而从157 nm到215 nm的谱带在188 nm处最大到O-Zr电荷转移过渡。对于掺杂Eu〜（3+）的样品，在222 nm处观察到O〜（2-）-Eu〜（3+）的电荷转移（CTB）的较弱带，对于掺杂Tb〜（3+）的样品则观察到223nm处的能带与Tb〜（3+）的4f-5d自旋允许跃迁有关。对于Dy〜（3 +）-和Sm〜（3+）掺杂的样品，O〜（2-）-Dy〜（3+）和O〜（2-）-Sm〜（3+）CTB没有据观察，这可能是由于氧的2p电子紧密结合在主晶格中的锆离子上。在掺有Tm〜（3+）的样品中，弱的O〜（2-）-Tm〜（3+）CTB位于170 nm处。观察到除了Tm〜（3+）之外，主体与发光活化剂（例如Eu〜（3 +），Tb〜（3+）和Sm〜（3+））之间存在能量转移。

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