Frenkel Excitons in Ordered PbI2 Clusters Incorporated into Zeolite
Frenkel Excitons in Ordered PbI2 Clusters Incorporated into Zeolite
复制标题
纳入沸石的有序 PbI2 簇中的弗兰克尔激子
DOI：
10.1080/10587259208047016
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发表时间：
1992
影响因子：
0.7
通讯作者：
T. Goto
中科院分区：
文献类型：
--
作者：
Zikang Tang;Y. Nozue;O. Terasaki;T. Goto
摘要测量了（PbI 2）5团簇在LTA沸石超笼中的漫反射光谱，在超笼中实现了团簇晶体的Frenkel激子。激子共振能量处的反射率随着负载密度接近饱和水平而急剧增加。这一结果不能用团簇密度的增加来解释，而是用团簇有序化来解释。我们提出了有序诱导的Frenkel激子的阻尼能的降低，因为预期在有序的（PbI 2）5团簇中激子的运动变窄。电子衍射谱图表明，团簇以2倍周期的沸石笼排列。
Abstract Diffuse reflection spectra are measured for (PbI2)5 clusters incorporated into supercages of zeolite LTA crystals, where the Frenkel exciton of cluster crystal is expected to be realized. The reflectivity at the exciton resonance energy drastically increases as the loading density nears the saturation level. This result can not be interpreted by the increase of the cluster density, but by the cluster ordering. We propose the order-induced decrease in the damping energy of the Frenkel exciton, because the motional narrowing of the exciton is expected in the ordered (PbI2)5 clusters. Electron diffraction pattern shows that clusters are arrayed in twice period of the zeolite cages.