Enhanced energy pumping to Tb3+ ions in manganese-doped ZnS nanoparticles

Doped nanoparticles for optoelectronics applications

“…Another nanosize-related effect was reported by us recently [12]. We demonstrated that the 4 T 1 to 6 A 1 intra-shell PL of Mn 2+ ions in ZnS nanoparticles can be efficiently pumped under band-to-band excitation, which was not observed for bulk ZnMnS (see Fig.…”

“…We concluded that enhanced host to Mn 2+ energy pumping is related to confinement enhanced Mn-free carrier interactions. We also demonstrated that the above-mentioned interaction affects rates of intra-shell transitions as long as photoexcited free carriers coexist with excited Mn 2+ ions (see [12] and references given there).…”

“…In the process described by us in the Ref. 12 we observed that band-to-band excitation of host ZnS nanoparticles is followed by efficient host-to-impurity energy transfer. We concluded that enhanced host to Mn 2+ energy pumping is related to confinement enhanced Mn-free carrier interactions.…”

“…For example, the 4 T 1 to 6 A 1 intra-shell transition of Mn 2+ ions is a parity and spin (transition between spin quartet and sextet) forbidden process. Thus, this transition is fairly inefficient in bulk samples, especially in sulfides and selenides [5][6][7][8][9][10][11][12].…”

“…In Fig. 1 we show PL excitation (PLE) spectra measured by us for terbium doped ZnS and ZrO 2 nanoparticles (see [12] for the details on sample technology and properties). In both cases efficient 4f-4f intra-shell PL of Tb 3+ is induced upon 4f-5d excitation of Tb 3+ .…”