Visible quantum cutting via downconversion in LiGdF4: Er3+, Tb3+ upon Er3+ 4f11 → 4f105d excitation
Visible quantum cutting via downconversion in LiGdF4: Er3+, Tb3+ upon Er3+ 4f11 → 4f105d excitation
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DOI：
10.1016/s0022-2313(99)00621-3
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发表时间：
2000-08
影响因子：
3.6
通讯作者：
R. Wegh;E. Loef;A. Meijerink
中科院分区：
文献类型：
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作者：
R. Wegh;E. Loef;A. Meijerink
报道了Er ~（3+）和Tb ~（3+）共掺LiGdF_4的可见光量子剪裁（每个吸收光子发射两个可见光光子）。在该化合物中，通过下转换实现可见量子切割，即，通过利用不同镧系元素离子之间的能量转移。在Er 3+的4f 105 d能级中的VUV激发时，部分激发能量可以通过交叉弛豫转移到Gd 3+，从而产生处于激发态的Er 3+和Gd 3+。随后发射出两个可见光子：一个来自Er 3+的4S 3/2→ 4 I 15/2跃迁，另一个来自Tb 3+的5DJ → 7 FJ跃迁。结果表明，这一过程发生，旁边的其他能量转移过程从Er 3 + 4f 105 d态到Gd 3+产生只有一个可见光子。
Visible quantum cutting (the emission of two photons of visible light per absorbed photon) is reported for LiGdF4codoped with Er3+and Tb3+. In this compound visible quantum cutting is achieved through downconversion, i.e., by making use of energy transfer between different lanthanide ions. Upon VUV excitation in the 4f105d levels of Er3+, part of the excitation energy can be transferred to Gd3+by cross-relaxation, yielding both Er3+and Gd3+in an excited state. This is followed by the emission of two visible photons: one from Er3+due to the4S3/2→4I15/2transition, and, after energy transfer from Gd3+to Tb3+, one from Tb3+due to the5DJ→7FJtransition. It is shown that this process occurs, next to other energy transfer processes from the Er3+4f105d states to Gd3+yielding only one visible photon.