Time-dependence of luminescence of nanoparticles of Eu2O3 and Tb2O3 deposited on and doped in alumina

Abstract

Nanoparticles of Eu2O3 and Tb2O3 have been prepared using ultrasound radiation and were deposited sonochemically on microspherical alumina particles. In a different sonochemical reaction Eu2O3 and Tb2O3 were doped into nanophased alumina particles. For both systems the decay times of the fluorescence was measured. The luminescence of the alumina substrate was found to be much shorter than that of the rare-earth oxides. Differences between the decay times of the deposited and doped materials are accounted for by the stronger guest-host interaction and absence of concentration quenching in the doped material.

Photoluminescence properties of Eu3+-doped barium strontium titanate (Ba, Sr) TiO3 ceramics

“…The emission lines of Eu 2 O 3 in the wavelength region between 550 and 595 nm have not been observed in our study since the measurements were carried out at room temperature. However, emissions in the regions of 595 -695 nm are in good agreement with the radiative life times of Eu 3+ [11,12]. PL emissions from 595 to 695 nm are due to 5 D 0 -7 F j ( j=2,3,4) transitions of Eu 3+ in agreement with other reported values [13,14].…”

Synthesis and photoluminescence characteristics of Dy3+-doped ZnAl2O4 nanocrystals via a combustion process

“…By introducing RE ions into different lattices, the materials can find potential applications in different aspects as optical amplifiers or lasers, phosphors and photocatalysts, especially when the size of the particles is reduced to nanoscale [1][2][3]. Dy 3+ , as one of the most investigated ions, has been studied extensively because it provides two typical emission bands in blue (480 nm) and yellow (570 nm) regions, which are necessary for full color displays [4][5][6].…”

Luminescence study in Eu-doped aluminum oxide phosphors

“…a-Al 2 O 3 is a material with a significant technological importance because of the large optical transparency from ultra-violet to near infrared wavelength, excellent mechanical properties and good chemical stability. In the same manner, among the variety of RE ions commonly used to dope different kind of materials, europium ions (Eu 3+ ) have attracted significant attention because they have tremendous potential for applications in some optical fields, such as phosphors, electroluminescent devices, optical amplifiers or lasers and high density optical storage [1,5,[10][11][12][13] level structure, especially the 5 D 0 ! 7 F j manifold which enables one to ascertain the microscopic symmetry around the site, making it an ideal experimental probe of the crystalline environment.…”