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- W2388895235 abstract "Surface effect is probably the most important factor that makes the spectral properties of rear earth doped nanosized materials different from that of bulk.In many cases,surface acts as a quenching center,that increases nonradiative transition rates of the dopant.Besides,the surface diversifies the local environments of the dopant ions,thus the emission spectra of nanosized materials may shift,split or get broadening.In Eu~(3+) doped nanoparticles,such a site inequivalency was studied widely with selective excitation.In this report,we show that the temperature dependent emission spectra are also a result of this effect.~5D_0→~7F_2 emission spectra of Eu~(3+) in nanocrystalline YVO_4 at different temperatures were measured with non-selective excitation.At low temperature,the spectrum is a broad band,superposed by a number of spectral lines,while at room temperature,it consists chiefly of two lines similar to that observed in bulk.Referring to the results of selective excitation in YVO_4∶Eu~(3+) nanoparticles,we decomposed the emission spectra into two parts: that(I_C) from the Eu~(3+) ions located near the particle center with the emission similar to that in bulk;and that(I_S) from Eu~(3+)(ions) close to the surface with the emission wavelengths extended wider.As the temperature decreases,the(relative) intensity of I_S /I_C approaches to a constant 2.3 in our sample with average radius of 27 nm.That gives an estimation of the surface layer thickness,4.5 nm,in which the spectral properties of the Eu~(3+) ions are disturbed by the surface.The temperature dependence of I_S /I_C can be fitted by either an energy transfer process with energy mismatch of900 cm~(-1) or an electron transfer process from the Eu ions to the surface traps across a 900 cm~(-1) barrier.The variation of the emission spectra originates from the temperature dependent quenching via surface quenching centers." @default.
- W2388895235 created "2016-06-24" @default.
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- W2388895235 date "2006-01-01" @default.
- W2388895235 modified "2023-09-27" @default.
- W2388895235 title "Temperature Dependence of the Emission Spectra in YVO_4∶Eu~(3+) Nanocrystals" @default.
- W2388895235 hasPublicationYear "2006" @default.
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