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Visible luminescence of nanocrystalline AlN:Er thin film by co-deposition of AlN, Er, and SiO2
J.-W. Lim,W. Takayama,Y.F. Zhu,J.W. Bae,J.F. Wang,S.Y. Ji,K. Mimura,J.H. Yoo,M. Isshiki 한국물리학회 2007 Current Applied Physics Vol.7 No.3
We report a visible luminescence of Er3+ ions in an amorphous-nanocrystalline AlN:Er thin lm prepared by co-deposition usingAlN, Er, and SiO2 3+ in the AlN:Er lm annealed at 750.C showed a strong bluish green emissionof Er3+ in the amorphous-nanocrystalline AlN:Er thin lm, which is attributed to the intra-4fEr3+ transitions of2H11/2!4I15/2 and4F7/2!4I15/2The occurrence of the strong Er3+ emission in the annealed AlN:Er thin lm with a mixture of amorphous and nanocrystalline phasesmay be contributed to an increase in the number of excitation Er3+ centers and a presence of oxygen related to Er3+ excitation andrecombination process in the AlN:Er thin film.
Lee, J,Bathany, C,Ahn, Y,Takayama, S,Jung, W IOP Publishing 2016 Laser physics letters Vol.13 No.2
<P>We present a volumetric monitoring method to observe the morphological changes of aqueous two phase system (ATPS) droplets in a microfluidic system. Our method is based on time-lapse optical coherence tomography (OCT) which allows the study of the dynamics of ATPS droplets while visualizing their 3D structures and providing quantitative information on the droplets. In this study, we monitored the process of rehydration and deformation of an ATPS droplet in a microfluidic system and quantified the changes of its volume and velocity under both static and dynamic fluid conditions. Our results indicate that time-lapse OCT is a very promising tool to evaluate the unprecedented features of droplet-based microfluidics.</P>
Agrestini, S.,Kuo, C.-Y.,Moretti Sala, M.,Hu, Z.,Kasinathan, D.,Ko, K.-T.,Glatzel, P.,Rossi, M.,Cafun, J.-D.,Kvashnina, K. O.,Matsumoto, A.,Takayama, T.,Takagi, H.,Tjeng, L. H.,Haverkort, M. W. American Physical Society 2017 Physical review. B Vol.95 No.20
<P>We have investigated the electronic structure of Sr2IrO4 using core-to-core resonant inelastic x-ray scattering. The experimental spectra can be well reproduced using ab initio density functional theory based multiplet ligand field theory calculations, thereby validating these calculations. We found that the low-energy, effective Ir t(2g) orbitals are practically degenerate in their crystal-field energy. We uncovered that Sr2IrO4 and iridates in general are negative charge transfer systems with large covalency and a substantial oxygen ligand hole character in the Ir t(2g) Wannier orbitals. This has far reaching consequences, as not only the on-site crystal-field energies are determined by the long-range crystal structure, but, more significantly, magnetic exchange interactions will have long-range distance dependent anisotropies in the spin direction. These findings set constraints and show pathways for the design of d(5) materials that can host compasslike magnetic interactions.</P>