Emission color tuning and phase transition determination based on high-pressure up-conversion luminescence in YVO4: Yb3+, Er3+ nanoparticles

• Published in: Journal of luminescence Vol. 209; pp. 321 - 327
• Main Authors: Woźny, Przemysław, Runowski, Marcin, Lis, Stefan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2019
• Subjects: High pressure phase transitions; Lanthanides; Tunable emission; Up-converting luminescent nanomaterials; Upconversion band shift; Yttrium vanadates; Up-converting luminescent nanomaterials; Lanthanides; Yttrium vanadates; High pressure phase transitions; Upconversion band shift; Tunable emission
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2019.02.008

Compression of up-converting (UC) YVO4 nanocrystals doped with Yb3+ and Er3+ ions leads to the luminescence color tuning, which can be used for the determination of pressure-induced zircon-to-scheelite phase transition. Spherical (≈20 nm), tetragonal YVO4: Yb3+-Er3+ UC nanoparticles (NPs) were synthesized by the hydrothermal method. The high-pressure spectroscopic analysis (up to ≈11 GPa) of the material was carried out in a diamond anvil cell (DAC), in a compression-decompression run. With the increasing pressure values, the intensity of UC emission (λex= 975 nm) decreased along with shifts of the band centroids. The maximum shifts was ≈ 0.39 nm/GPa, for the 4F9/2→4I15/2 transition. Broadening of the bands and overlapping of the split Stark sub-levels were also observed. The sudden and huge change in the band ratios, and deviations from the linear shift tendency of chromaticity coordinates in the CIE diagram around ≈ 8 GPa, clearly shows the influence of phase transition on the luminescence properties of the material, under high pressure conditions. [Display omitted]