Spectroscopic properties of Nd{sup 3+} ions in nano-perovskite CaTiO{sub 3}

• Published in: Journal of solid state chemistry Vol. 184; no. 10
• Main Authors: Lemanski, K., Gagor, A., Kurnatowska, M., Pazik, R., Deren, P.J.
• Format: Journal Article
• Language: English
• Published: United States 15.10.2011
• Subjects: ABSORPTION; ANNEALING; ARSENIC COMPOUNDS; ARSENIDES; CHARGED PARTICLES; ELEMENTS; EMISSION; EMISSION SPECTRA; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; EXCITATION; FLUIDS; GALLIUM ARSENIDES; GALLIUM COMPOUNDS; HEAT TREATMENTS; INDIUM ARSENIDES; INDIUM COMPOUNDS; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; IONS; LIQUIDS; LUMINESCENCE; METALS; MINERALS; NANOSTRUCTURES; NEODYMIUM; NEODYMIUM IONS; NITROGEN; NONMETALS; OXIDE MINERALS; PEROVSKITE; PEROVSKITES; PHOTON EMISSION; PNICTIDES; RARE EARTHS; SOL-GEL PROCESS; SORPTION; SPECTRA
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2011.08.004

In this work, we present for the first time the spectroscopic properties of perovskite nanocrystals CaTiO{sub 3}: Nd{sup 3+}, measured at room and liquid nitrogen temperature. Samples were prepared by the sol-gel method and annealed at 700 and 1000 deg. C. The concentration of Nd{sup 3+} ranged from 0.5% to 5%. Average nanocrystallite size primarily depends on the annealed temperature and is about 25 and 50 nm for 700 and 1000 deg. C, respectively. The absorption, emission and excitation spectra (monitored at 1078 nm) as well as the decay time profile of the emission from the {sup 4}F{sub 3/2} energy level of Nd{sup 3+} are obtained. The increasing amount of Nd{sup 3+} ions decreases the lifetime of the {sup 4}F{sub 3/2} level and that changes from 146 {mu}s for 0.5% to 50 {mu}s for 5% of Nd{sup 3+} concentration. The strongest emission was observed at two regions: 1050-1120 nm and 865-930 nm and was assigned to the {sup 4}F{sub 3/2}{yields}{sup 4}I{sub 11/2} and {sup 4}F{sub 3/2}{yields}{sup 4}I{sub 9/2} transitions, respectively. The spectroscopic quality parameter of neodymium in the CaTiO{sub 3} lattice has been calculated from the emission spectra. The influence of luminescent properties depending on the annealing temperature and concentration of neodymium ions is discussed. - Graphical abstract: The 300 K emission spectrum of CaTiO{sub 3}: 1% Nd{sup 3+} annealed at 700 deg. C and measured at 300 K on InGaAs detector. Highlights: > Nano-CaTiO{sub 3}: Nd{sup 3+} phosphor has been prepared by using the sol-gel method. > The spectroscopic quality parameter in CaTiO{sub 3} depends on Nd{sup 3+} concentration. > Neodymium strongly influence the structural and spectroscopic properties of CaTiO{sub 3}.