Luminescence of the System (Y, Gd, Tb)2, SiO5 :Eu3+

Abstract

Oxyorthosilicates of the system (Y. Gd, Tb)2SiO5:Eu3+ crystallize in dependence on the Y:Gd+ Tb ratio in the X1 or X2 type. In cathodoluminescence an energy transfer from the hole trap Tb3+ to the electron trap Eu3+ is working for materials of X2 type up to medium Tb3+ concentrations. However, due to the reduced hole capture cross section of Tb3+ the energy transfer is hampered for the X1, series. In photoluminescence a meaningful energy transfer Tb3+ → Eu3+ is only present for high Tb3+ concentrations, working in this case due to the mobility of the excitation energy in the Tb3+ sublattice in the X1, as well as the X2, type. The mechanism of energy transfer in cathodo‐ and photoluminescence is discussed.

Site selectively excited luminescence and energy transfer of X1-Y2SiO5:Eu at nanometric scale

“…2,3 In both structures, there are two crystallographically nonequivalent RE ͑REϭrare-earth͒ sites of the low symmetry C 1 , which differ in coordination to oxygen: 7 and 9 for X 1 type; 6 and 7 for X 2 type. 4 The study of the luminescent properties on Y 2 SiO 5 :Eu was almost restricted to X 2 phase and there are only very few spectroscopic results on X 1 -Y 2 SiO 5 :Eu. This is essentially due to the fact that the pure X 1 phase using the above-mentioned preparation method is difficult to obtain.…”

Synthesis and VUV photoluminescence of green-emitting X2–Y2SiO5:Tb3+ phosphor for PDP application

“…The pattern of (b) is well in agreement with the standard pattern of JCPDS 36-1476 as presented in (c), while the pattern of (a) accords with the data of standard JCPDS 41-0004. It has been reported that the transformation from X 1 -Y 2 SiO 5 to X 2 -Y 2 SiO 5 began at about 1190 • C [10]. The XRD result indicated that single phase of X 2 -Y 2 SiO 5 crystallized completely at 1250 • C by co-precipitation method, this temperature is much lower than the synthesis temperature of solid-state reaction, which is about 1500 • C [11].…”