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Multifunctional Eu3+- and Er3+/Yb3+-doped GdVO4 nanoparticles synthesized by reverse micelle method.

Gavrilović TV, Jovanović DJ, Lojpur V, Dramićanin MD - Sci Rep (2014)

Bottom Line: Using cyclohexane, Triton X-100, and n-pentanol as the oil, surfactant, and co-surfactant, respectively, crystalline nanoparticles with ~4 nm diameter are prepared at low temperatures.The ratio of green emissions from (2)H11/2 → (2)I15/2 and (4)S3/2 → (4)I15/2 transitions is temperature dependent and can be used for nanoscale temperature sensing with near-infrared excitation.The relative sensor sensitivity is 1.11%K(-1), which is among the highest sensitivities recorded for upconversion-luminescence-based thermometers.

View Article: PubMed Central - PubMed

Affiliation: Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia.

ABSTRACT
Synthesis of Eu(3+)- and Er(3+)/Yb(3+)-doped GdVO4 nanoparticles in reverse micelles and their multifunctional luminescence properties are presented. Using cyclohexane, Triton X-100, and n-pentanol as the oil, surfactant, and co-surfactant, respectively, crystalline nanoparticles with ~4 nm diameter are prepared at low temperatures. The particle size assessed using transmission electron microscopy is similar to the crystallite size obtained from X-ray diffraction measurements, suggesting that each particle comprises a single crystallite. Eu(3+)-doped GdVO4 nanoparticles emit red light through downconversion upon UV excitation. Er(3+)/Yb(3+)-doped GdVO4 nanoparticles exhibit several functions; apart from the downconversion of UV radiation into visible green light, they act as upconvertors, transforming near-infrared excitation (980 nm) into visible green light. The ratio of green emissions from (2)H11/2 → (2)I15/2 and (4)S3/2 → (4)I15/2 transitions is temperature dependent and can be used for nanoscale temperature sensing with near-infrared excitation. The relative sensor sensitivity is 1.11%K(-1), which is among the highest sensitivities recorded for upconversion-luminescence-based thermometers.

No MeSH data available.


Related in: MedlinePlus

(a) Fluorescence intensity ratio (FIR) values of GdVO4:Er3+/Yb3+ nanopowder as a function of temperature (dots) and corresponding line obtained by fitting Equation (2).(b) Absolute (blue line) and relative (red) sensitivity of FIR temperature sensor based on the upconversion of GdVO4:Er3+/Yb3+ nanopowder.
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f8: (a) Fluorescence intensity ratio (FIR) values of GdVO4:Er3+/Yb3+ nanopowder as a function of temperature (dots) and corresponding line obtained by fitting Equation (2).(b) Absolute (blue line) and relative (red) sensitivity of FIR temperature sensor based on the upconversion of GdVO4:Er3+/Yb3+ nanopowder.

Mentions: Fitting of the experimental data with Equation (2), shown in Figure 8a, shows good correlation between experiment and theory, and is also in agreement with previous reports on thermometry performed using Er3+ UC emission3839. The obtained parameters, log(B) = 2.81 and C = 1047.52 cm−1, provide the absolute sensor sensitivity, Sa [in K−1]: and the relative sensor sensitivity, Sr [in %K−1]: The sensitivity values calculated from Equations (3) and (4) are shown in Figure 8b. The maximal value of the relative sensitivity, 1.11%K−1, is found at 307 K; it is very similar to those found in NaYF4:Yb3+,Er3+4041 and gold-decorated Gd2O3:Yb3+,Er3+39. This result is among the highest relative sensitivities of thermometers based on UC emission (for a comparison see Table S1 in the Supporting Information of Ref. 38). A temperature resolution of ~1 K can be estimated from δFIR/Sa, where δFIR is the resolution of the FIR calculated from the standard deviation of the residuals in the polynomial interpolation of the experimental data points (temperature vs. FIR curve)3639. Information on the temperature resolution may also be deduced from the sensitivity of the detection system and the calculated sensitivity.


Multifunctional Eu3+- and Er3+/Yb3+-doped GdVO4 nanoparticles synthesized by reverse micelle method.

Gavrilović TV, Jovanović DJ, Lojpur V, Dramićanin MD - Sci Rep (2014)

(a) Fluorescence intensity ratio (FIR) values of GdVO4:Er3+/Yb3+ nanopowder as a function of temperature (dots) and corresponding line obtained by fitting Equation (2).(b) Absolute (blue line) and relative (red) sensitivity of FIR temperature sensor based on the upconversion of GdVO4:Er3+/Yb3+ nanopowder.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3936229&req=5

f8: (a) Fluorescence intensity ratio (FIR) values of GdVO4:Er3+/Yb3+ nanopowder as a function of temperature (dots) and corresponding line obtained by fitting Equation (2).(b) Absolute (blue line) and relative (red) sensitivity of FIR temperature sensor based on the upconversion of GdVO4:Er3+/Yb3+ nanopowder.
Mentions: Fitting of the experimental data with Equation (2), shown in Figure 8a, shows good correlation between experiment and theory, and is also in agreement with previous reports on thermometry performed using Er3+ UC emission3839. The obtained parameters, log(B) = 2.81 and C = 1047.52 cm−1, provide the absolute sensor sensitivity, Sa [in K−1]: and the relative sensor sensitivity, Sr [in %K−1]: The sensitivity values calculated from Equations (3) and (4) are shown in Figure 8b. The maximal value of the relative sensitivity, 1.11%K−1, is found at 307 K; it is very similar to those found in NaYF4:Yb3+,Er3+4041 and gold-decorated Gd2O3:Yb3+,Er3+39. This result is among the highest relative sensitivities of thermometers based on UC emission (for a comparison see Table S1 in the Supporting Information of Ref. 38). A temperature resolution of ~1 K can be estimated from δFIR/Sa, where δFIR is the resolution of the FIR calculated from the standard deviation of the residuals in the polynomial interpolation of the experimental data points (temperature vs. FIR curve)3639. Information on the temperature resolution may also be deduced from the sensitivity of the detection system and the calculated sensitivity.

Bottom Line: Using cyclohexane, Triton X-100, and n-pentanol as the oil, surfactant, and co-surfactant, respectively, crystalline nanoparticles with ~4 nm diameter are prepared at low temperatures.The ratio of green emissions from (2)H11/2 → (2)I15/2 and (4)S3/2 → (4)I15/2 transitions is temperature dependent and can be used for nanoscale temperature sensing with near-infrared excitation.The relative sensor sensitivity is 1.11%K(-1), which is among the highest sensitivities recorded for upconversion-luminescence-based thermometers.

View Article: PubMed Central - PubMed

Affiliation: Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia.

ABSTRACT
Synthesis of Eu(3+)- and Er(3+)/Yb(3+)-doped GdVO4 nanoparticles in reverse micelles and their multifunctional luminescence properties are presented. Using cyclohexane, Triton X-100, and n-pentanol as the oil, surfactant, and co-surfactant, respectively, crystalline nanoparticles with ~4 nm diameter are prepared at low temperatures. The particle size assessed using transmission electron microscopy is similar to the crystallite size obtained from X-ray diffraction measurements, suggesting that each particle comprises a single crystallite. Eu(3+)-doped GdVO4 nanoparticles emit red light through downconversion upon UV excitation. Er(3+)/Yb(3+)-doped GdVO4 nanoparticles exhibit several functions; apart from the downconversion of UV radiation into visible green light, they act as upconvertors, transforming near-infrared excitation (980 nm) into visible green light. The ratio of green emissions from (2)H11/2 → (2)I15/2 and (4)S3/2 → (4)I15/2 transitions is temperature dependent and can be used for nanoscale temperature sensing with near-infrared excitation. The relative sensor sensitivity is 1.11%K(-1), which is among the highest sensitivities recorded for upconversion-luminescence-based thermometers.

No MeSH data available.


Related in: MedlinePlus