Cross relaxation in CaTiO3 and LaAlO3 perovskite nanocrystals doped with Ho3+ ions

LaAlO3: Ho3+(0.5–10%) and CaTiO3: Ho3+ (0.1–2%) nanosized perovskites were prepared with the Pechini and sol–gel method, respectively. The spectroscopic properties of CaTiO3: Ho3+ were investigated for the first time. The cross relaxation energy transfer processes were determined as a function of Ho...

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Bibliographic Details
Published in:Journal of luminescence 2014-10, Vol.154, p.62-67
Main Authors: DEREN, P. J, LEMANSKI, K
Format: Article
Language:English
Subjects:
CaTiO3
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross relaxation
Cross-disciplinary physics: materials science
rheology
Dopant clustering
Exact sciences and technology
Holmium
LaAlO3
Luminescence
Materials science
Materials synthesis
materials processing
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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Summary:LaAlO3: Ho3+(0.5–10%) and CaTiO3: Ho3+ (0.1–2%) nanosized perovskites were prepared with the Pechini and sol–gel method, respectively. The spectroscopic properties of CaTiO3: Ho3+ were investigated for the first time. The cross relaxation energy transfer processes were determined as a function of Ho3+ concentration, by examination of the two strongest transitions observed in the visible region arising from 5S2 and 5F5 multiplets. The cross relaxation processes for the investigated Ho3+ levels were described. It was found that the clustering processes for CaTiO3 is so strong, that increase of dopant concentration weakly influence the cross relaxation processes, while in LaAlO3, where dopants are located randomly in the crystal lattice, clear monotonic dependence is observed. •Spectroscopic properties of Ho3+ in LaAlO3 and CaTiO3 nanocrystals were investigated.•The emission quenching occurred, due to the nonradiative processes in the matrix.•In CaTiO3 doped RE3+ ions tend to locate close to each other forming RE3+ pairs.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2014.04.008