6533b7cffe1ef96bd1259788
RESEARCH PRODUCT
Comparing the luminescence processes of YVO4:Eu and core-shell YVO4@YF3 nanocrystals with bulk-YVO4:Eu
L. ShirmaneClaus FeldmannVladimir PankratovVladimir Pankratovsubject
010302 applied physicsMaterials sciencePhotoluminescencePassivationAnalytical chemistryNanoparticle02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesNanocrystalline materialElectronic Optical and Magnetic MaterialsCrystallinityNanocrystal0103 physical sciencesElectrical and Electronic Engineering0210 nano-technologyLuminescenceSpectroscopydescription
Abstract Comparative analysis of bulk, non-coated and core-shelled nanocrystalline YVO4:Eu was performed by means of time-resolved luminescence and VUV excitation luminescence spectroscopy techniques. Nanocrystalline YVO4:Eu samples – both as-prepared and YF3 core-shelled – have been synthesized by means of a microwave-assisted synthesis in ionic liquids, which allows to obtain 10–12 nm nanoparticles with high crystallinity. The results show noticeable differences between bulk and nanocrystalline YVO4:Eu in photoluminescence experimental data, which explains by influence of the nanocrystal surface. A YF3 core-shell layer around YVO4:Eu nanoparticles partially recovers the intensity of the Eu3+ emission. It is demonstrated that the Eu3+ luminescence recovery is achieved at the expense of the suppression of the intrinsic emission but not due to the passivation of surface loss centers in core-shelled nanocrystals. It is also shown that surface loss processes are the reason of the degradation of energy transfer efficiency from the host lattice to Eu3+ under high-energy excitations in vacuum ultraviolet spectral range.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 | Physica B: Condensed Matter |