![]() This study was completed using various experimental techniques such as emission spectroscopy with the Eu3+ ion used as structural probe. Waveguide Raman spectroscopy was used to characterize the structure of these guides and to study the mechanisms accompanying the sintering as a function of annealing temperature. Optical and geometrical properties were obtained using m-lines spectroscopy and by measuring the attenuation coefficients. These guides were prepared using sol-gel methods and deposited by dip-coating technique. This work concerns the elaboration and the characterization of ZrO2 planar waveguides undoped and doped with semiconducting nanoparticles and/or rare-earth ions. Taken together, the above evidence indicates that the micro-clusters’ strong PL is produced by changes in the local environment of the Er3+ inside the thin film surrounding the erbium-rich aggregates. Analysis of the PL Stark splitting shows a correlation between the micro-clusters’ fine structure and the strength of their PL. Mapping micro-photoluminescence measurements onto SEM images reveals that the erbium aggregates alone do not generate the enhanced PL, but rather the thin film encasing the aggregates is the origin of the emissions. Even though erbium aggregation has been reported to cause quenching, we demonstrate that the micro-clusters as a whole can exhibit significantly enhanced erbium photoluminescence (PL), with emissions over 24 times brighter than the surrounding non-cluster region. Through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), we identify these micro-clusters as structures where the film curves away from the substrate to encase erbium-rich aggregates. This paper reports on the formation of unique micrometer-scale clusters in erbium-doped silicon-rich silicon oxide (ErSRSO) thin films produced by thermal evaporation. Intensity is observed for the 550-nm transition, with lower enhancement factors ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |