We report simultaneous crystal growth and deposition of upconverting
Yb3+/Er3+ doped NaYF4 film (UCF) on conducting and non-conducting substrates
by one-step hydrothermal method. The characteristics such as film
topography, morphology, crystallographic phase and upconverting luminescence
intensity were found to depend both on the chelating agent and nature of the
substrate. The characteristics of the prepared films varied interestingly
when either the chelating agent or the substrate was changed. The
upconversion emission intensities were found to increase with decreasing
film roughness. Further, current investigation demonstrated that the NaYF4
films deposited using EDTA or DTPA chelating agents on ITO substrate and
EGTA chelating agent on PG substrate were more uniform and resulted in
greater upconverted emission intensities. We envision plausible use of
current technology in the development of affordable optical platforms for
several optoelectronic applications.
The development of a sensitive α-NaYF4:Yb3+, Er3+ solid-phase upconverting platform (UCP) has been realized using Moringa oleifera leaf extract for selective detection of arsenite contamination in drinking water. The presence...
Correction for ‘Development of ultrasensitive and As(iii)-selective upconverting (NaYF4:Yb3+,Er3+) platform’ by Suman Duhan et al., Analyst, 2020, 145, 6378–6387, DOI: 10.1039/D0AN00717J.
The development of a sensitive alpha-NaYF4:Yb3+, Er3+ solid-phase upconverting platform (UCP) has been realized using Moringa oleifera leaf extract for selective detection of arsenic (As III) contamination in drinking water. The presence of polyphenols in the leaves extract is shown to induce luminescence resonance transfer (LRET), diminishing thereby the Er3+ upconverting red and green emissions activated by 980 nm excitation. However, addition of As3+ species interrupts the LRET process and restores emission proportionately. This feature allows platform to selectively detect arsenic pollution in water below the safe limit of 10 ppt. The uniqueness of UCP lies in monitoring the As3+ contamination in samples containing heavy ions (Cd2+, Hg2+) as well, without apparent effect on the signal reproducibility. UCP is also found to be insensitive to other interfering ions like Pb2+, H2PO4-, F-, Cl-, Ca2+, Mg2+, Sn2+, Cr6+, Fe2+ and Co2+, if present.<br><br>
The development of a sensitive alpha-NaYF4:Yb3+, Er3+ solid-phase upconverting platform (UCP) has been realized using Moringa oleifera leaf extract for selective detection of arsenic (As III) contamination in drinking water. The presence of polyphenols in the leaves extract is shown to induce luminescence resonance transfer (LRET), diminishing thereby the Er3+ upconverting red and green emissions activated by 980 nm excitation. However, addition of As3+ species interrupts the LRET process and restores emission proportionately. This feature allows platform to selectively detect arsenic pollution in water below the safe limit of 10 ppt. The uniqueness of UCP lies in monitoring the As3+ contamination in samples containing heavy ions (Cd2+, Hg2+) as well, without apparent effect on the signal reproducibility. UCP is also found to be insensitive to other interfering ions like Pb2+, H2PO4-, F-, Cl-, Ca2+, Mg2+, Sn2+, Cr6+, Fe2+ and Co2+, if present.<br><br>
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