Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

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types responsible for the UV and blue luminescence are characteristic for AlN crystalline lattice irrespective to material size and structure. The oxygen-related defects together with the host material vacancies from the bulk AlN are the more probable candidates for the UV luminescence centers, whereas the blue luminescence could be related to the defects situated near or at the material surface. The recombination mechanism of UV luminescence was confirmed using the 263 nm laser excitation of AlN ceramics with varied intensity in 10-300 K temperature range. It was found that increase of excitation density causes blue shift of the band maximum, typical for recombination luminescence in semiconductors. Results of the study of the photoluminescence under varied laser intensity as well as that of afterglow allow elucidating of donor-acceptor pair distribution and recombination processes in AlN ceramics. Photoluminescence of doped AlN with Mn and other elements also was studied. It allows evaluate AlN as prospective material for visible and white light emitters. These studies were performed within a support of European project ERDF 2010/0253/2DP / 2.1.1.1.0/10/APIA/VIAA/079. COMPOUND MATERIALS Al X Ga 1-X N B.Berzina, L.Trinkler, J.Grigorjeva, V.Korsaks Compound materials Al x Ga 1-x N in form of nanorods or thin layers are synthesized in National Taiwan University (Dr. Li-Chyong Chen). The band gap of the material depends on parameter x which varies between 3% and 12%. The photoluminiscence spectra of Al x Ga 1-x N were studied within a temperature range between 8 K and 300 K. The exciton-induced luminescence demonstrating the band gap variations is observed in UV spectral region and its properties are studied. These studies were performed within a support of collaboration project between Taiwan-Lithuania-Latvia. Scientific Publications 1. T.Glaskova, M.Zarelli, A.Anishkevich, M.Giordano, L.Trinkler, B.Berzina, „Quantitative optical analysis of filler dispersion degree in MWCNT-epoxy nanocomposite”. Composites Science and Technology, 72 (2012) 477-481; http://www.sciencedirect.com/science/article/pii/S0266353811004210 2. V. Korsaks, B. Berziņa, L. Trinklere, “Influence of air, oxygen, nitrogen and argon gases on 400 nm luminescence in hexagonal boron nitride”. Latvian journal of physics and technical science 49 (2012) 57-62. 3. L. Trinkler, B. Berzina, Z. Jevsjutina, J. Grabis, I. Steins and C. J. Baily, “Photoluminescence of Al 2 O 3 nanopowders of different phases”. Optical Materials 34 (2012) 1553–1557; http://dx.doi.org/10.1016/j.optmat.2012.03.029 4. V. Skvortsova, N. Mironova-Ulmane, L. Trinkler, D. Riekstina, ”Impurity defects in wide gap inorganic materials”. Proceeding of the 5th WSEAS International Conference on Materials Science (MATERIALS '12), Sliema, Malta, 7-9 September 2012, In book: “Advances in Data Networks, Communications, Computers and Materials”. Editors V. M. Marques and A. Dmitriev, Published by WSEAS Press, Sliema, Malta, 2012, pp.233-238. 20
Lectures on Conferences 28 th LU Scientific Conference of Institute of Solid State Physics, University of Latvia, February 8 - 10, 2012, Riga, Latvia 1. V.Korsaks, B.Berziņa, L.Trinklere, “Native defect luminescence in different structured hBN”, Book of Abstracts, 2012, p. 59. 2. J.Grigorjeva, B.Berzina, L.Trinklere, A.Sarakovskis, "Luminescence of ternary nanostructure AlGaN”, Book of Abstracts, 2012, p.33. International Conference FM&NT; Functional materials and nanotechnologies 2012; Institute of Solid State Physics University of Latvia April 17 – 20, Riga 3. R.Aleksiejunas, S.Nargelas, S. Miadojedovas, P. Scajev, K. Jarasiunas, L.Trinkler, J.Grigorjeva, B.Berzina, K.H.Chen, Li-C.Chen, “Carrier dynamics in nanostructures of ternary AlGaN with tunable bandgap”. Book of Abstracts, 2012, p. 264. 19th International Symposium on Matestable, Amorphous and Nanostructured Materials, 18-22 June, 2012, Moscow, Russia 4. L.Trinkler, B.Berzina, J.Grabis, „Influence of phase transition on photoluminescence of Al 2 O 3 nanopowders”, Book of Abstracts, 2012, p.89. International Conference on Defects in Insulating Materials (ICDIM 2012), 24-29 June, 2012, Santa Fe, USA 5. V. Korsaks, B. Berzina, L. Trinklere, „Surface defects related photoluminescence of hexagonal boron nitride dependent on surrounding gases”, Book of Abstracts p. 53. International Conference on Luminescence and Laser Physics, 16-22 July, 2012, Pescanka, Irkutsk, Russia 6. L.Trinkler, B.Berzina, J.Grigorjeva, „Peculiarities of laser-induced luminescence proceses in AlN ceramics at low temperatures”, Book of Abstracts, 2012, p.15. 14th International Conference-School Advanced Materials and Technologies, 27-31 August, 2012, Palanga, Lithuania 7. V. Korsaks, R. Kirsteins, B. Berzina, L. Trinkler, “Photoluminescence of hexagonal boron nitride macro and nano materials dependent on surrounding gases and pretreatment”, Book of Abstracts, 2012, p.53. 8. J. Grigorjeva, V. Korsaks, L. Trinkler, B. Berzina, „Luminescence of ternary AlGaN nanomaterials”, Book of Abstracts, 2012, p.76. International Conference on Diamond and Carbon Materials 2012, 2 – 6 September, 2012,Granada, Spain 9. B.Berzina, V.Korsaks, L.Trinkler, „Carbon related hexagonal boron nitride as oxygen sensor”, Programme book, 2012, P1.60. 21
Page 1 and 2: Institute of Solid State Physics Un
Page 3 and 4: CONTENTS Introduction 4 Department
Page 5 and 6: ORGANIZATIONAL STUCTURE OF THE ISSP
Page 7 and 8: The annual report summarizes the re
Page 9 and 10: The main source for international f
Page 11 and 12: lector at the Faculty of Physics an
Page 13 and 14: the samples having different phase
Page 15 and 16: LABORATORY OF MAGNETIC RESONANCE SP
Page 17 and 18: Scientific publications 1. U. Rogul
Page 19: Main investigations and results ALU
Page 23 and 24: Main Results LASER CRYSTALLIZATION
Page 25 and 26: CONTROLLED MANIPULATION AND MECHANI
Page 27 and 28: DEPARTMENT OF FERROELECTRICS Head o
Page 29 and 30: Belorussia 1. Institute of solid st
Page 31 and 32: Density and dielectric properties f
Page 33 and 34: CONCENTRATION AND THERMAL PHASE TRA
Page 35 and 36: Latvia; SSPA ”Scientific-Practica
Page 37 and 38: • Δ T εmax : Mn>Co>Fe>Cu~Ni •
Page 39 and 40: Li x Na 1-x Ta y Nb 1-y O 3 Solid S
Page 41 and 42: 34. А.И. Бурханов, И.Е.
Page 43 and 44: 16. Š. Svirskas, M. Ivanov, Š. Ba
Page 45 and 46: 45. С.Н. Каллаев, А.Р.
Page 47 and 48: LABORATORY OF VISUAL PERCEPTION Hea
Page 49 and 50: in terms of colour coordinate dispe
Page 51 and 52: 4. R.Truksa, S.Fomins, M.Ozolins, "
Page 53 and 54: Scientific visits abroad 1. Dr. hab
Page 55 and 56: experimental data. We focused on th
Page 57 and 58: GB1 with oxygen vacancy revealed th
Page 59 and 60: Fig. 4. The thermodynamic stability
Page 61 and 62: a supercell model was used, and the
Page 63 and 64: a) b) l [110] d [110] (001) Fig. 9.
Page 65 and 66: Drain CNT Source Drain GNR Source 5
Page 67 and 68: The oxygen incorporation energy for
Page 69 and 70: such as high thermal stability, ver
Page 71 and 72:
STATISTICAL ANALYSIS AND CELLULAR A
Page 73 and 74:
REGIONS OF AZIMUTHAL INSTABILITY IN
Page 75 and 76:
25. A. Gopejenko, Yu.F. Zhukovskii,
Page 77 and 78:
15. S. Piskunov and E. Spohr, "SrTi
Page 79 and 80:
43. P. Merzlakov, G. Zvejnieks, V.N
Page 81 and 82:
XII. Annual Monitory Meeting of Eur
Page 83 and 84:
91. L. Shirmane, A.I. Popov, V. Pan
Page 85 and 86:
115. A.I. Popov, J. Zimmermann, V.
Page 87 and 88:
Estonia Institute of Physics, Tartu
Page 89 and 90:
5. Grigorjeva L., Jankoviča D., Sm
Page 91 and 92:
LABORATORY OF AMORPHOUS MATERIALS S
Page 93 and 94:
Main results ABSORPTION AND LUMINES
Page 95 and 96:
LUMINESCENCE OF FUSED AND UNFUSED B
Page 97 and 98:
enables sensitive and selective det
Page 99 and 100:
LABORATORY OF OPTICAL RECORDING Hea
Page 101 and 102:
HOLOGRAPHIC LITHOGRAPHY IN AMORPHOU
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5. U.Gertners, J.Teteris, The impac
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24. J.Aleksejeva, J.Teteris, A.Tokm
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Israel Technion, Haifa (Dr.S.Stolya
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3. A. Rusakova, J. Maniks, K. Schwa
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• Investigation of energetic stru
Page 113 and 114:
Scheme 2 Synthesis of indane-1,3-di
Page 115 and 116:
The synthesized compounds ZWK-1, DW
Page 117 and 118:
7. A. Vembris, K. Pudzs, I. Muzikan
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20. A. Vembris, K. Pudzs, I. Muzika
Page 121 and 122:
• Ion transfer problems related t
Page 123 and 124:
13. SIA „EMU PRIM”, 14. JSC „
Page 125 and 126:
Main results Laboratory of Solid St
Page 127 and 128:
Flax and Hemp Fiber Functionalizati
Page 129 and 130:
CHARACTERIZATION OF LiFePO4/C COMPO
Page 131 and 132:
Fig.1. Upper panel: 4 × 4 ×4 supe
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Fig.1. Left panel: Schematic view o
Page 135 and 136:
Titania with anatase structure is i
Page 137 and 138:
RESEARCH OF CATHODE MATERIALS FOR L
Page 139 and 140:
17. T Dizhbite, J Ponomarenko, A An
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6. J. Kleperis, B. Sloka, J. Dimant
Page 143 and 144:
33. P. Lesnicenoks, A. Sivars, L. G
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France 1. Institute Laue-Langevin,
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different neutron orbits (11/2[615]
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LABORATORY OF ELECTRONIC ENGINEERIN
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2. For JSC Augstsprieguma tīkls an
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4. By orders of several organizatio
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Partners: Fonons Ltd, Riga Technica
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Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

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