Exploring the Effect of Size Variability on Efficiency of Upconversion Nanoparticles as Optical Contrast Agents

Banerjee, Abhishek; Kumar, Somesh; Sarkar, Minarul I.; Poddar, Raju

doi:10.1007/s10895-023-03375-0

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Previous studies strongly suggested that NaYF 4 and NaGdF 4 are desirable hosts due to their lowphonon energy that can effectively suppress the non-radiative relaxation, high solubility for RE ions, and high thermal stability [6,7]. Another common problem encountered by the small UCNCs is the strong surface luminescence quenching due to a high surface to volume ratio [8][9][10]. The coating of the inert shell on the active core UCNCs is a generally used method to spatially separate the activators and the surface quenching centers and thus greatly improve the upconversion emission intensity [11,12].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystals Incorporated with Mordenite Zeolite Composites with Enhanced Upconversion Emission for Cu2+ Detection

Lin,

Ye,

Pan

et al. 2024

Materials

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In this research, upconversion nanocrystals incorporated with MOR zeolite composites were synthesized using the desilicated MOR zeolite as a host for the in situ growth of NaREF4 (RE = Y, Gd) Yb/Er nanocrystals. The structure and morphology of the composites were studied with XRD, XPS, and TEM measurements, and the spectral studies indicated that the subsequent thermal treatment can effectively improve the upconversion emission intensity of Er3+. By using the NaYF4:Yb/Er@DSi1.0MOR-HT composite that holds the strongest upconversion emission, a probe of UCNC@DSiMOR/BPEI was constructed with the modification of branched poly ethylenimine for the detection of Cu2+. It was indicated that the integrated emission intensity of Er3+ shows a linear dependence with the logarithm value of the Cu2+ concentration ranging from 0.1 to 10 μM. This study offered a feasible method for the construction of UCNC@zeolite composites with enhanced upconversion emission, which may have a potential application as fluorescent probes for the detection of various metal ions by adjusting the doping luminescent center.

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