Thermally stimulated recombination processes and luminescence in Li6(Y,Gd,Eu)(BO3)3 crystals

Luminescence and electronic excitations in Li6Gd(BO3)3: Ce3+ crystals

“…Our earlier studies [14,15] revealed a monotonic dependence of the intensity of steady state LGBO radioluminescence on temperature which accounts for the buildup of the intrinsic luminescence of LGBO by about a factor 15 at temperatures ranging from 100 to 500 K. A buildup effect, somewhat smaller in mag nitude, was observed in these studies in the lumines cence of the Ce 3+ impurity centers as well.…”

“…At the same time, migration of electronic excitation energy among 6 I j levels over the Gd 3+ ion chains is more effi cient than that among the 6 P j levels [21]. Assuming the temperature dependence of the luminescence inten sity at 3.97 eV to be dominated primarily by the rate of 6 I j 6 P j vibrational relaxation, we proposed earlier a relation to approximate the temperature dependence of this luminescence in the LGBO crystal excited by X rays from a laboratory source [14,15] (1)…”

A Comparative Study of Li6 R(BO3 )3 ; R = Gd, Lu, & Y), Single Crystals for Thermal Neutron Detection

“…It was subsequently followed by another crushing and mixing of the sintered material and finally sintering it at 700 °C for 24 h. This leaves traces of un‐reacted materials and hence another sintering at 700 °C for 24 h has been carried out. It is observed that a single sintering for even longer hours is not as beneficial as the two‐step method used here since the phase formation of the material after the reaction should be uniform which otherwise becomes a hard lump and makes the phase formation difficult during the sintering . The as‐prepared material was loaded in a platinum crucible and heated to its melting point (850 °C) using an RF generator.…”

Cathodoluminescence kinetics of Li6GdB3O9 crystals

“…[12][13][14][15]. Intrinsic luminescence of LGBO crystals and luminescence of Ce 3 þ and Eu 3 þ impurities in these crystals have been investigated in detail for different types of excitation over a wide temperature range from 4 to 500 K. These LGBO emissions have been studied not only upon selective photoexcitation in the UV [1,4,3,16,17], vacuum UV (VUV) [18][19][20][21] and soft X-rays [22,23] energy regions, but the laboratory excitation sources of ionizing radiation as well [24][25][26]. Optical properties of LGBO crystals in the temperature range of 77-300 K were studied in Refs.…”