Strong Quenching of Tb3+ Emission by Tb–V Interaction in YPO4–YVO4

摘要: Solid solutions in the system YPO4–YVO4, with and without 2 mol% of Tb3, were studied to determine reason for total inactivity Tb YVO4. The comparison diffuse reflectivity Tb‐containing that Tb‐free ones shows a uv absorption at energies below edge YVO4 materials containing both terbium vanadium. Selective excitation directly into Tb3+ these wavelength regions produced reduced emission when there was vanadium present. band VO43+ groups, under electron beam excitation, strongly quenched whenever Emission Dy3+, present as 10‐ppm impurity all samples, also by presence vanadium, but not either alone. All observations imply energy loss Tb–V interaction. A particular mechanism—the well‐known intervalence transfer charge from V resulting an abrupt change bond strength leading t...