Articles
All articles | Recent articles
Synthesis, Characterization and Luminescence Properties of Pr3+-Doped C12A7 and C3A
E. Tõldsepp, E. Feldbach, M. Kirm
Institute of Physics, University of Tartu, Riia 142, Tartu, Estonia
received September 28, 2012, received in revised form November 27, 2012, accepted Januar 16, 2013
Vol. 4, No. 2, Pages 77-84 DOI: 10.4416/JCST2012-00039a
Abstract
This paper presents comparative results of luminescence studies on complex wide-band-gap calcium aluminates 12CaO·7Al2O3 (C12A7, Eg∼7.0 eV) and 3CaO·Al2O3 (C3A, Eg∼6.5 eV) doped with Pr3+ ions. Doped C12A7 ceramics and C3A powders were prepared via self-propagating combustion synthesis followed by different thermal treatments. Time-resolved VUV spectroscopy of C3A:Pr3+ revealed fast interconfigurational 5d-4f emission of Pr3+ in the region of 3 eV – 4.5 eVwith lifetimes of ∼ 17 ns upon direct excitation of Pr3+ 5d levels, and ∼ 30 ns upon interband transitions. Acceleration of decay times (∼ 12 – 13 ns) were observed upon XUV excitation at 130 eV. In C3A, multiple non-equivalent lattice sites for Pr3+ ions were identified. The energy transfer from host to Pr3+ 5d states is inefficient, particularly in C12A7, where the separation of 5d-4f transitions from other competing luminescence channels is not straightforward owing to the complexity of the host crystal band structure. The slow intraconfigurational 4f-4f emission originating from the second stage of 4f cascade was observed for both compounds.
Download Full Article (PDF)
Keywords
Calcium aluminate, C12A7, C3A, praseodymium, VUV spectroscopy
References
1 Kuck, S., Sokolska, I., Henke, M., Scheffler, T., Osiac, E.: Emission and excitation characteristics and internal quantum efficiencies of vacuum-ultraviolet excited Pr3+-doped fluoride compounds, Phys. Rev. B, 71, 165112, (2005).
2 Rodnyi, P.A., Mikhrin, S.B., Dorenbos, P., van der Kolk, E., van Eijk, C.W.E., Vink, A.P., Avanesov, A.G.: The observation of photon cascade emission in Pr3+-doped compounds under X-ray excitation, Opt. Commun., 204, 237 – 245, (2002).
3 Srivastava, A.M., Beers, W.W.: Luminescence of Pr3+ in SrAl12O19: observation of two photon luminescence in oxide lattice, J. Lumin., 71, 285 – 290, (1997).
4 Sharma, S.K., Pitale, S.S., Malik, M.M., Dubey, R.N., Qureshi, M.S.: Synthesis and detailed kinetic analysis using computerized glow-curve deconvolution technique of nanocrystalline Sr3Al2O6:Pr3+. A new phosphor for UV applications, Phys. Status Solidi (a), 205, 2695 – 2703, (2008).
5 Chawla, S., Kumar, N., Chander, H.: Broad yellow orange emission from SrAl2O4:Pr3+ phosphor with blue excitation for application to white LEDs, J. Lumin., 129, 114 – 118, (2009).
6 Matsuishi, S., Toda, Y., Miyakawa, M., Hayashi, K., Kamiya, T., Hirano, M., Tanaka, I., Hosono, H.: High-density electron anions in a nanoporous single Crystal: [Ca24Al28O64]4+(4e-), Science, 301, 626 – 629, (2003).
7 Hayashi, K., Sushko, P.V., Ramo, D.M., Shluger, A.L., Watauchi, S., Tanaka, I., Matsuishi, S., Hirano, M., Hosono, H.: Nanoporous crystal 12CaO·7Al2O3: A playground for studies of ultraviolet optical absorption of negative Ions., J. Phys. Chem. B, 111 (8), 1946 – 1956, (2007).
8 McLeod, J.A., Buling. A., Kurmaev, E.Z., Sushko, P.V., Neumann, M., Finkelstein, L.D., Kim, S.-W., Hosono, H., Moewes, A.: Spectroscopic characterization of a multiband complex oxide: insulating and conducting cement 12CaO·7Al2O3, Phys. Rev. B, 85, 045204, (2012).
9 Sushko, P.V., Shluger, A.L., Hayashi, K., Hirano, M., Hosono, H.: Hopping and optical absorption of electrons in nano-porous crystal 12CaO·7Al2O3, Thin Solid Films, 445, 161 – 167, (2003).
10 Mondal, P., Jeffrey, J.W.: The crystal structure of tricalcium aluminate, Ca3Al2O6, Acta Cryst., B31, 689 – 697, (1975).
11 Alonso, J., Rasines, I., Soubeyroux, J.: Tristrontium dialuminate Hexaoxide: an intricate superstructure of perovskite, Inorg. Chem., 29, 4768 – 4771, (1990).
12 Schiffbauer, D., Wickleder, C., Meyer, G., Kirm, M., Stephan, M., Schmidt, P.: Crystal structure, electronic structure, and luminescence of Cs2KYF6 : Pr3+, Z. Anorg. Allg. Chem., 631, 3046 – 3052, (2005).
13 Wang, D., Liu, Y.X., Liu, Y.C., Xu, C.S., Shao, C.L., Li, X.H.: Preparation and visible emission of Er-doped 12CaO·7Al2O3 powder, J. Nanosci. Nanotechnol., 8, 1458 – 1463, (2008).
14 Zhang, P., Xu, M., Liu, L., Li, L.: Luminescent properties of Sr3Al2O6: eu, pr prepared by sol-gel method, J. Sol Gel Sci. Technol., 50, 267 – 270, (2009).
15 Tõldsepp, E., Avarmaa, T., Denks, V., Feldbach, E., Kirm, M., Maaroos, A., Mändar, H., Vielhauer, S.: Synthesis and luminescence properties of Ce3+ doped nanoporous 12CaO·7Al2O3 powders and ceramics, Opt. Mater., 32, 784 – 788, (2010).
16 Xue, L.L., Liu, Y. X., Xu, C. S., Liu, Y. C., Zhao, C. J., Zhang, X. T.: Characterization and optical transition in tb-doped 12CaO·7Al2O3 Powders, J. Nanosci. Nanotechnol., 10, 2125 – 2130, (2010).
17 Zhu, H., Liu, Y., Yan, D., Yan, X., Liu, C., Xu, C.: White luminescence of Dy3+ ions doped 12CaO·7Al2O3 nanopowders under UV light excitation, J. Nanosci. Nanotechnol., 11, 9958 – 9963, (2011).
18 Ianos, R., Lazau, I., Pacurariu, C., Barvinschi, P.: Fuel mixture approach for solution combustion synthesis of Ca3Al2O6 powders, Cem. Concr. Res., 39, 566 – 572, (2009).
19 Kim, S., Miyakawa, M., Hayashi, K., Sakai, T., Hirano, M., Hosono, H.: Simple and efficient fabrication of room temperature stable electride: Melt-solidification and glass ceramics, J. Am. Chem. Soc., 127, 1370 – 1371, (2005).
20 Kim, S., Matsuishi, S., Miyakawa, M., Hayashi, K., Hirano, M., Hosono, H.: Fabrication of room temperature-stable 12CaO·7Al2O3 electride: a review, J. Mater. Sci. – Mater. El., 18, S5 – S14, (2007).
21 Kajihara, K., Matsuishi, S., Hayashi, K., Hirano, M., Hosono, H.: Vibrational dynamics and oxygen diffusion in a nanoporous oxide ion conductor 12CaO·7Al2O3 studied by O-18 labeling and micro-raman spectroscopy, J. Phys. Chem. C, 111, 14855 – 14861, (2007).
22 Zimmerer, G.: SUPERLUMI: A unique setup for luminescence spectroscopy with synchrotron radiation, Radiat. Measur., 42, 859 – 864, (2007).
23 Kirm, M., Lushchik, A., Lushchik, C., Vielhauer, S., Zimmerer, G.: Luminescence of pure and doped Al2O3 and MgO single crystals under inner-shell excitation, J. Lumin., 102 – 103, 307 – 312, (2003).
24 Babin, V., Feldbach, E., Kirm, M., Makhov, V.N., Vielhauer, S.: Deep VUV scintillators for detectors working in cryogenic environment, IEEE Trans. Nucl. Sci., 55, 1437 – 1444, (2008).
25 Feldbach, E., Denks, V.P., Kirm, M., Kunnus, K., Maaroos, A.: Intrinsic excitons in 12CaO·7Al2O3, Radiat. Meas., 45, 281 – 283, (2010).
26 Vedda, A., Fasoli, M., Nikl, M., Laguta, V.V., Mihokova, E., Pejchal, J., Yoshikawa, A., Zhuravleva, M.: Trap-center recombination processes by rare earth activators in YAlO3 single crystal host, Phys. Rev. B, 80, 045113 – 1-9, (2009).
27 Lushchik, A., Kirm, M., Lushchik, C., Martinson, I., Zimmerer, G.: Luminescence of free and self-trapped excitons in wide-gap oxides, J. Lumin., 87 – 89, 232 – 234, (2000).
28 Dorenbos, P.: The 5d level positions of the trivalent lanthanides in inorganic compounds, J. Lumin., 91, 155 – 176, (2000).
29 Makhov, V., Khaidukov, N., Kirikova, N., Kirm, M., Krupa, J., Ouvarova, T., Zimmerer, G.: VUV emission of rare-earth ions doped into fluoride crystals, J. Lumin., 87 – 89, 1005 – 1007, (2000).
Copyright
Göller Verlag GmbH
