Radioluminescence of Dy3+ in uranium-containing solutions of phosphorous oxychloride

Abstract

Samples of POCl 3 -SnCl 4 -235 UO 2 -Dy 3+ solutions have been prepared to investigate conversion of energy of heavy charged particles into optical radiation. Experimental data on radioluminescent charac teristics of Dy 3+ upon homogenous excitation of solutions by uranium α radiation have been obtained. The efficiency of conversion of the energy of uranium α particles into light energy depends on the Dy 3+ concen tration and the Dy3+ luminescence lifetime τ. At [Dy 3+ ] = 0.2 mol/L and τ = 550 μs, the conversion effi ciency is 0.12 ± 0.01% for the luminescent transition 4F 9 /2 → 6H 13 /2 (λ max = 574 nm) or 0.20 ± 0.01% for the visible and near IR regions of Dy3+ luminescence.

Single-Bubble Sonoluminescence of Colloidal Suspensions of Europium(II) Salt Nanoparticles

“…In this case, as is typical for other cases of collisional excitation, for example, RL, the luminescence spectrum of these centers coincides with their spectrum upon photoexcitation. 2,4,5 The larger cross-section of nanoparticles compared to the cross-section of many individual luminescence centers located in it increases the probability of collisional excitation.…”

“…Among them, the first three types of luminescence of lanthanide ions are well studied, at least in solutions, and research in this field is summarized in a number of monographs and review papers. [3][4][5][6][7][8] The SL of lanthanide ions belongs to the least studied type. However, Ln 3+ SL has been considered repeatedly to date, and the characteristic spectral bands of a number of Ln 3+ ions were recorded for multibubble SL, [9][10][11] single-bubble SL (SBSL), 10,12,13 and moving SBSL (m-SBSL) 13,14 in aqueous solutions, as well as for m-SBSL colloidal suspensions of compounds of these ions.…”