Rearrangement of optical centers and stimulated radiation of Eu3+ in polycrystalline huntite under optical and electron-beam excitation

Spectroscopic properties of Sm-containing yttrium-aluminoborate glasses and analogous huntite-like polycrystals

“…This fact may be caused by initial segregation of Sm 3þ ions into structural defects of huntite microcrystals or by luminescence quenchers which form complexes with the activators. In this regard, we remark that (1) similar defect centers formation by the rare-earth activators in huntite polycrystals was recently shown [22] by the example of EuAl 3 (BO 3 ) 4 (2) the role of quenchers may be played by triply-charged iron impurities in [FeO 6 ] polyhedrons, which are characterized by excited states at 20,000 and 15,380 cm À1 [23].…”

Laser-induced spectra change in nanocrystalline GdYO3:Eu3+

“…For different samples, the intensity ratio k of 5 D 0 -7 F 2 transition (at 612 nm) to 5 D 0 -7 F 1 transition change with reducers. The ratios are around 7.1, 7.5, 1. irradiation was established [15]. More atoms are located at the particle surface as the particle size decreases, and numerous surface defects exist.…”

Growth of the complex borates YxRySc2+z(BO3)4 (R = Nd, Pr, x + y + z = 2) with huntite structure

“…However dopant may occupy wrong cation position which is not in line with its radius. For example, the partial substitution of Al positions by Eu in EuAl 3 (BO 3 ) 4 crystals was proposed in …”