Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912388
E. Ozturk, N. O. Kalaycioglu
Mn4+ doped and Pr3+,4+, Sm3+, Gd3+, Tb3+,4+, Ho3+, Er3+, Tm3+ and Yb3+ co-doped MgAl2Si2O8-based phosphors were prepared by conventional solid state synthesis at 1300 °C. They were characterized by thermogravimetry (TG), differential thermal analysis (DTA), X-ray powder diffraction (XRD), photoluminescence (PL) and scanning electron microscopy (SEM). The luminescence mechanism of the phosphors, which showed broad red emission bands in the range of 600-715 nm and had a different maximum intensity when activated by UV illumination, was discussed. Such a red emission can be attributed to the intrinsic 2E→4A2 transitions of Mn4+.
{"title":"Comparison of MgAl2Si2O8:Mn4+ systems doped with co-activator ions in terms of long lifetime for optoelectronic applications","authors":"E. Ozturk, N. O. Kalaycioglu","doi":"10.1109/OMEE.2014.6912388","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912388","url":null,"abstract":"Mn<sup>4+</sup> doped and Pr<sup>3+,4+</sup>, Sm<sup>3+</sup>, Gd<sup>3+</sup>, Tb<sup>3+,4+</sup>, Ho<sup>3+</sup>, Er<sup>3+</sup>, Tm<sup>3+</sup> and Yb<sup>3+</sup> co-doped MgAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub>-based phosphors were prepared by conventional solid state synthesis at 1300 °C. They were characterized by thermogravimetry (TG), differential thermal analysis (DTA), X-ray powder diffraction (XRD), photoluminescence (PL) and scanning electron microscopy (SEM). The luminescence mechanism of the phosphors, which showed broad red emission bands in the range of 600-715 nm and had a different maximum intensity when activated by UV illumination, was discussed. Such a red emission can be attributed to the intrinsic <sup>2</sup>E→<sup>4</sup>A<sub>2</sub> transitions of Mn<sup>4+</sup>.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125346959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912366
B. Ostafiychuk, B. Deputat, L. Kaykan, V. Pylypiv, O. Ugorchuk
The study of electrochemical parameters of lithium power sources with cathodes based on synthesized samples Li0.5Fe2.5-yAlyO4 (y = 0.6, 0.8 and 1.0) were performed by the methods of impedance spectroscopy (SEI) and cyclic voltammetry (CVA) at low speed scan. The energy characteristics of sources and diffusion coefficient of lithium into cathode matrix are determined.
{"title":"Electrochemical properties of lithium power sources with cathodes by mixed spinel oxides Li2O-Fe2O3-Al2O3","authors":"B. Ostafiychuk, B. Deputat, L. Kaykan, V. Pylypiv, O. Ugorchuk","doi":"10.1109/OMEE.2014.6912366","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912366","url":null,"abstract":"The study of electrochemical parameters of lithium power sources with cathodes based on synthesized samples Li<sub>0.5</sub>Fe<sub>2.5-y</sub>Al<sub>y</sub>O<sub>4</sub> (y = 0.6, 0.8 and 1.0) were performed by the methods of impedance spectroscopy (SEI) and cyclic voltammetry (CVA) at low speed scan. The energy characteristics of sources and diffusion coefficient of lithium into cathode matrix are determined.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114893326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912387
N. Martynyuk, O. Buryy, S. Ubizskii, I. Syvorotka, K. Becker
In this communication we analyze the reasons for distinctions of Yb2+ → Yb3+ recharging processes taking place in Yb:Y3Al5O12 epitaxial films and bulk crystals under high temperature annealing. Influence of sample surface structure on the rate of oxidation process was found to be significant.
{"title":"Peculiarities of recharging process Yb2+ → Yb3+ in Yb:Y3Al5O12 epitaxial films under high temperature oxidation","authors":"N. Martynyuk, O. Buryy, S. Ubizskii, I. Syvorotka, K. Becker","doi":"10.1109/OMEE.2014.6912387","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912387","url":null,"abstract":"In this communication we analyze the reasons for distinctions of Yb<sup>2+</sup> → Yb<sup>3+</sup> recharging processes taking place in Yb:Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> epitaxial films and bulk crystals under high temperature annealing. Influence of sample surface structure on the rate of oxidation process was found to be significant.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114895121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912407
Y. Gorobets, O. Gorobets, V. Kulish
In the paper, spin waves in an uniaxial two-sublattice antiferromagnet are studied. A similar solution of the Landau-Lifshitz equation is investigated. For different spin wave velocities, equations for this solution are obtained.
{"title":"Spin waves in an antiferromagnet: A similar solution of the Landau-Lifshitz equation","authors":"Y. Gorobets, O. Gorobets, V. Kulish","doi":"10.1109/OMEE.2014.6912407","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912407","url":null,"abstract":"In the paper, spin waves in an uniaxial two-sublattice antiferromagnet are studied. A similar solution of the Landau-Lifshitz equation is investigated. For different spin wave velocities, equations for this solution are obtained.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115043156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912395
Y. Hizhnyi, S. Nedilko, V. Chornii, K. Terebilenko, I. Zatovsky, V. Boyko
The origin of intrinsic luminescence and mechanisms of excitation energy transfer in undoped K2Bi(WO4)(PO4) and K6.5Bi2.5W4P6O34 crystals are revealed in complex experimental and computational studies. The photoluminescence (PL) properties are studied under the VUV synchrotron excitations. The electronic structures of the crystals are calculated using the FLAPW method. Calculations indicate different character of the density of electronic states in the lower parts of the Conduction bands of K2Bi(WO4)(PO4) and K6.5Bi2.5W4P6O34. The PL emission spectra of K2Bi(WO4)(PO4) and K6.5Bi2.5W4P6O34 reveal wide bands peaking near 540 and 620 nm respectively. The PL in both compounds is effectively excited in 3.7 - 8 eV region of excitation energies.
{"title":"Electronic structure and VUV spectroscopy of bismuth-containing phosphate-tungstate crystals","authors":"Y. Hizhnyi, S. Nedilko, V. Chornii, K. Terebilenko, I. Zatovsky, V. Boyko","doi":"10.1109/OMEE.2014.6912395","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912395","url":null,"abstract":"The origin of intrinsic luminescence and mechanisms of excitation energy transfer in undoped K<sub>2</sub>Bi(WO<sub>4</sub>)(PO<sub>4</sub>) and K<sub>6.5</sub>Bi<sub>2.5</sub>W<sub>4</sub>P<sub>6</sub>O<sub>34</sub> crystals are revealed in complex experimental and computational studies. The photoluminescence (PL) properties are studied under the VUV synchrotron excitations. The electronic structures of the crystals are calculated using the FLAPW method. Calculations indicate different character of the density of electronic states in the lower parts of the Conduction bands of K<sub>2</sub>Bi(WO<sub>4</sub>)(PO<sub>4</sub>) and K<sub>6.5</sub>Bi<sub>2.5</sub>W<sub>4</sub>P<sub>6</sub>O<sub>34</sub>. The PL emission spectra of K<sub>2</sub>Bi(WO<sub>4</sub>)(PO<sub>4</sub>) and K<sub>6.5</sub>Bi<sub>2.5</sub>W<sub>4</sub>P<sub>6</sub>O<sub>34</sub> reveal wide bands peaking near 540 and 620 nm respectively. The PL in both compounds is effectively excited in 3.7 - 8 eV region of excitation energies.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122550367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912411
V. Berzhansky, T. Mikhailova, A. Karavainikov, A. Prokopov, A. Shaposhnikov, Y. Kharchenko, I. Lukienko, O. Miloslavskaya, M. F. Kharchenko, V. Golub
Optical and magneto-optical spectra in transmission and reflection and its features for microcavity one-dimensional magnetophotonic crystals with double layer bismuth-substituted iron garnet films are considered.
研究了双铋取代铁石榴石薄膜微腔一维磁光子晶体的透射和反射光谱及其特征。
{"title":"Optical and magneto-optical responses of 1D-MPC with double layer iron garnet films in transmission and reflection","authors":"V. Berzhansky, T. Mikhailova, A. Karavainikov, A. Prokopov, A. Shaposhnikov, Y. Kharchenko, I. Lukienko, O. Miloslavskaya, M. F. Kharchenko, V. Golub","doi":"10.1109/OMEE.2014.6912411","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912411","url":null,"abstract":"Optical and magneto-optical spectra in transmission and reflection and its features for microcavity one-dimensional magnetophotonic crystals with double layer bismuth-substituted iron garnet films are considered.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129612569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912396
V. Boyko, S. Nedilko, Y. Hizhnyi, V. Chornii, K. Terebilenko, I. Zatovsky, O. Gomenyuk, V. Sheludko
The photoluminescence properties of undoped Al(PO3)3 crystals synthesized by flux method are studied under VUV synchrotron excitations. The electronic structure of Al(PO3)3 crystals is calculated by the FLAPW method. The PL emission spectra of Al(PO3)3 reveal emission bands in the violet and in the yellow-red spectral regions. Obtained results point to an active role of the electronic states of phosphate groups in the processes of intrinsic luminescence in Al(PO3)3 crystals.
{"title":"VUV spectroscopy and electronic structure of Al(PO3)3 crystals","authors":"V. Boyko, S. Nedilko, Y. Hizhnyi, V. Chornii, K. Terebilenko, I. Zatovsky, O. Gomenyuk, V. Sheludko","doi":"10.1109/OMEE.2014.6912396","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912396","url":null,"abstract":"The photoluminescence properties of undoped Al(PO<sub>3</sub>)<sub>3</sub> crystals synthesized by flux method are studied under VUV synchrotron excitations. The electronic structure of Al(PO<sub>3</sub>)<sub>3</sub> crystals is calculated by the FLAPW method. The PL emission spectra of Al(PO<sub>3</sub>)<sub>3</sub> reveal emission bands in the violet and in the yellow-red spectral regions. Obtained results point to an active role of the electronic states of phosphate groups in the processes of intrinsic luminescence in Al(PO<sub>3</sub>)<sub>3</sub> crystals.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127714293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912404
D. Sugak
The paper is to discuss the main characteristics of the influence of high temperature annealing in different gas environments on the optical and structural properties of congruent lithium niobate crystals.
本文讨论了不同气体环境下高温退火对铌酸锂晶体光学性能和结构性能影响的主要特点。
{"title":"Main peculiarities of coloring changes of congruent LiNbO3 crystals under redox annealing","authors":"D. Sugak","doi":"10.1109/OMEE.2014.6912404","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912404","url":null,"abstract":"The paper is to discuss the main characteristics of the influence of high temperature annealing in different gas environments on the optical and structural properties of congruent lithium niobate crystals.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127761647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912367
V. Shevchuk, I. Kayun
The stereo-atomic crystal structure analysis to crystals with the structure of scheelite was applied. The program package TOPOS 4.0 for calculation was used. Migration path for Mo ions in CaMoO4 at different temperatures and for W ions in BaWO4 was visualized.
{"title":"Migration ways of ions in CaMoO4 and BaWO4 crystals with scheelite-type structure","authors":"V. Shevchuk, I. Kayun","doi":"10.1109/OMEE.2014.6912367","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912367","url":null,"abstract":"The stereo-atomic crystal structure analysis to crystals with the structure of scheelite was applied. The program package TOPOS 4.0 for calculation was used. Migration path for Mo ions in CaMoO4 at different temperatures and for W ions in BaWO4 was visualized.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"67 4-5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120971819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-26DOI: 10.1109/OMEE.2014.6912375
V. Chornii, Y. Hizhnyi, S. Nedilko, K. Terebilenko, I. Zatovsky, I. Ogorodnyk, V. Boyko
The polycrystalline samples of K2BiZr(PO4)3 were synthesized by spontaneous crystallization method. The photoluminescence (PL) spectroscopy studies of K2BiZr(PO4)3 are carried out under the VUV synchrotron excitations. The electronic structure of K2BiZr(PO4)3 is calculated by the FLAPW method. The PL spectra of K2BiZr(PO4)3 reveal two main components in the UV and visible spectral regions (peaking near 3.6 and 2.6 eV respectively). It is assumed that the UV PL component of K2BiZr(PO4)3 originates from transitions in ZrO6 polyhedra, while the visible one is related to Bi3+ ions in oxygen coordination.
{"title":"Synthesis, electronic structure and VUV spectroscopy of K2BiZr(PO4)3 Crystals","authors":"V. Chornii, Y. Hizhnyi, S. Nedilko, K. Terebilenko, I. Zatovsky, I. Ogorodnyk, V. Boyko","doi":"10.1109/OMEE.2014.6912375","DOIUrl":"https://doi.org/10.1109/OMEE.2014.6912375","url":null,"abstract":"The polycrystalline samples of K<sub>2</sub>BiZr(PO<sub>4</sub>)<sub>3</sub> were synthesized by spontaneous crystallization method. The photoluminescence (PL) spectroscopy studies of K<sub>2</sub>BiZr(PO<sub>4</sub>)<sub>3</sub> are carried out under the VUV synchrotron excitations. The electronic structure of K<sub>2</sub>BiZr(PO<sub>4</sub>)<sub>3</sub> is calculated by the FLAPW method. The PL spectra of K<sub>2</sub>BiZr(PO<sub>4</sub>)<sub>3</sub> reveal two main components in the UV and visible spectral regions (peaking near 3.6 and 2.6 eV respectively). It is assumed that the UV PL component of K<sub>2</sub>BiZr(PO<sub>4</sub>)<sub>3</sub> originates from transitions in ZrO<sub>6</sub> polyhedra, while the visible one is related to Bi<sup>3+</sup> ions in oxygen coordination.","PeriodicalId":142377,"journal":{"name":"International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122420320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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