Analysis of the upconversion photoluminescence spectra as a probe of local microstructure in Y2O3/Eu3+ nanotubes under high pressure

摘要

In situ upconversion photoluminescence measurements of Y2O3/Eu3+ nanotubes under high pressure were carried out with 632.8 nm laser light excitation. The intensity of D-5(0)-F-7(J) (J = 0,1,2) transitions increased up to 8.2 GPa due to the enhanced crystal filed with pressure, while above 8.2 GPa, the photoluminescence intensity decreased rapidly. Full width of half maximum (FWHM) of D-5(0)-F-7(0,1,2) transitions and I0-2/I0-1 of the Eu3+ ion luminescence both exhibited obvious changes near 8.2 GPa, indicating the presence of short-range structural changes in the vicinity of the Eu3+-ion. The observed changes reflected a disordering of local micro-structure in the vicinity of Eu3+-ions resulting from the short-range distortion of YO6 octahedra under pressure. The luminescence of doped Eu3+ ions acted as an effective probe to reveal slight changes in structure and the local crystalline environment of Y2O3/Eu3+ nanotubes under high pressure.