Specific features of luminescence properties of nanostructured aluminum oxide

Computer simulation of the photoluminescence of nanostructured aluminum oxide excited with pulsed synchrotron radiation

“…The obtained data agree with the data in [18], where it was shown that τ F is 0.74 µs for the α Al 2 O 3 sample with an average particle size of 60 nm and is 0.25 µs for the sample with an average particle size of 15 nm. Based on the experimental data and taking into account regularities of the physical processes, we can suggest that the PL decay of F + centers in nanostruc tured α Al 2 O 3 occurs in the picosecond range as the nanoparticle sizes decrease.…”

“…The lumines cent layer thickness was chosen by taking into account the sample transparency and the penetration depth of the exciting SR quanta with the chosen energy (i.e., with ). The nanostructured α Al 2 O 3 samples are nontransparent, a thin porous surface layer with a thickness of no more than 100 nm luminesces in them [18]. Based on experimental data, the function ϕ(R) was assumed to be unity.…”

VUV spectroscopy and electronic excitations in nano-size alumina

“…There are only a few experimental reports on intrinsic electronic properties obtained for d-Al 2 O 3 powder or for mixed amorphous-crystalline Al 2 O 3 films (Aarik et al, 2005). Luminescence properties of g-and d-Al 2 O 3 nanopowders have been evaluated in Gorbunov et al (2005) and nano-ceramics in Kortov et al (2008). The main goal of our work was to investigate the electronic properties of the d-and Q-phases of alumina and comparison of properties with the a-phase.…”

Influence of the temperature of aluminum oxide micropowder modification with Al2O3 nanopowders on the optical properties and radiation resistance of coatings manufactured on their basis

“…Among the defects whose concentration increases on powder heating during modification by nanoparticles can be not only aluminum ions and atoms in different charged states (Al i 3+ , Al i 2+ , Al i + , and Al i 0 ), which can be explained and is the most probable fact, but also the F and F + centers [10][11][12][13][14][15][16][17][18]. The F and F + centers can be formed during powder heating due to free electrons trapped by anion vacancies.…”