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Gerelkhuu, Zayakhuu,Huy, Bui The,Chung, Jong Won,Phan, The-Long,Conte, Eric,Lee, Yong-Ill North-Holland 2017 Journal of luminescence Vol.187 No.-
<P><B>Abstract</B></P> <P>Upconversion phosphors can convert near-infrared light into visible emission by sequentially absorbing multiple photons. In most studies, Yb<SUP>3+</SUP>/Er<SUP>3+</SUP>, Yb<SUP>3+</SUP>/Tm<SUP>3+</SUP> ions are used as sensitizer/activator in host materials. In this work, we introduce chromium (Cr<SUP>3+</SUP>) ions to NaLu<SUB>0.86-x</SUB>Gd<SUB>0.12</SUB>F<SUB>4</SUB>:Cr<SUB>x</SUB> <SUP>3+</SUP>Er<SUB>0.02</SUB> <SUP>3+</SUP> (UCCr) material that is instead of ytterbium (Yb<SUP>3+</SUP>) ions. The UCCr material with a different concentration of Cr<SUP>3+</SUP> ions (0≤x≤0.24) was synthesized by a facile hydrothermal synthesis method. The characterization of the developed UCCr material was performed by photoluminescence (PL), Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and Electron paramagnetic resonance (EPR). The effect of Cr<SUP>3+</SUP> ions on the upconversion luminescence and magnetic-resonant properties of UCCr material was investigated in detail. The upconversion mechanism was proposed.</P>
Gerelkhuu, Zayakhuu,Huy, Bui The,Sharipov, Mirkomil,Jung, Dasom,Phan, The-Long,Conte, Eric D.,Lee, Yong-Ill Elsevier 2018 Materials science & engineering. C, Materials for Vol.86 No.-
<P>Upconversion nanoparticles (UCNPs) possess a unique type of photoluminescence (PL) in which lower-energy excitation is converted into higher-energy emission via multi-photon absorption processes. In this work, we have used a facile one-step hydrothermal method promoted water solubility to synthesis NaLuGdF4:Yb3+/Er3+(Tm3+) UCNPs coated with malonic acid (MA). Scanning electron microscopy images and X-ray diffraction patterns reveal sphere-shaped UCNPs with an average size of similar to 80 nm crystallized in the cubic NaLuF4 structure. The characteristic vibrations of cubic UCNPs have been taken into account by using Fourier-transform infrared spectroscopy. Based on PL studies, we have determined an optimal concentration of Gd3+ doping. The dependence of upconversion PL intensity on Gd3+ concentration is discussed via the results of magnetization measurements, which is related to the coupling/uncoupling of Gd3+ ions. Particularly, our study reveals that carboxyl-functionalized NaLuGdF4:Yb3+/Er3+(Tm3+) UCNPs have a relatively high cell viability with HeLa cells.</P>
Huy, Bui The,Gerelkhuu, Zayakhuu,Chung, Jong Won,Dao, Van-Duong,Ajithkumar, Gangadharan,Lee, Yong-Ill Elsevier 2017 Materials science and engineering B. Advanced Func Vol.223 No.-
<P>Cr3+-doped Nalm(0.70-x)Gd(0.10)F(4):Yb0.18Er0.02Crx nanoparticles were synthesized by one step solvothermal method. The structural, emission properties were studied by XRD, FT-IR, emission spectra. The doping of 15 mol% Cr3+ into NaLu0.70-xGd0.10F4:Yb0.18Er0.02Crx induced cubic-hexagonal phase transition, with a consequent 20 times improvement in the upconversion fluorescence quantum yield. The roles of Cr3+ in the phase transition as well as the mechanism of the multi-photon upconversion process in the material were discussed. The Yb3+-Cr3+ dimer could play the role of as a sensitizer by transferring energy to Er3+. The Cr3+ ions result an asymmetry in the environment surrounding the rare-earth ions, which would favor the hypersensitive transitions. This research may open up a new perspective to prepare high upconversion luminescent materials. (C) 2017 Elsevier B.V. All rights reserved.</P>
Salah M. Tawfik,Mirkomil Sharipov,Buithehuy,Zayakhuu Gerelkhuu,Dana Biechele-Speziale,이용일 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Naturally modified nonionic alginate-based polymers were synthesized to act as functionalizing agentsfor upconversion nanoparticles (UCNPs). The synthesized polymer-UCNPs hybrid nanoparticles showhigh stability, excellent biocompatibility and enhanced luminescence intensity for NIR imaging. Additionally, our results show that due to the large cavities of the materials and amphiphilic polymershell, these nonionic alginate-functionalized UCNPs were able to load the anticancer drug doxorubicin(DOX) with the exceptional efficiency as well as release it in a highly controlled and selectivepH-responsive manner via folate receptor-mediated endocytosis. Targeting using this multifunctionpolymer significantly improved the capability of DOX-loaded UCNPs to inhibit the growth of KB cancercells than free DOX. These biocompatible nonionic alginate-functionalized UCNPs hold substantialpotential as effective anticancer drug-delivery carriers and NIR imaging agents.
Nguyen, Thu-Thuy T.,Huy, Bui The,Tawfik, Salah M.,Zayakhuu, Gerelkhuu,Cho, Hyo Hyun,Lee, Yong-Ill Elsevier 2020 Arabian journal of chemistry Vol.13 No.1
<P><B>Abstract</B></P> <P>A Glutathione (GSH) optical sensor with high sensitivity and exceptional selectivity was developed using one-step synthesized-upconversion nanoparticles (UCNPs, NaLuF<SUB>4</SUB>:Gd<SUP>3+</SUP>,Yb<SUP>3+</SUP>,Er<SUP>3+</SUP>) in conjunction with a Rhodamine B derivative (RBD). RBD was loaded on the surface of the UCNPs though non-covalent bonding to serve as an energy acceptor, while UCNPs served as energy donors. The sensor based on a coupling fluorescence resonance energy transfer (FRET) process at an excitation of 980 nm wavelength from UCNP to RBD with a ring-opening process of RBD after the addition of GSH. The sensing probe exhibits a remarkable limit of detection (LOD = 50 nM) for GSH through the enhancement of the fluorescence intensity of RBD at 592 nm, together with a concomitant reduction in the green band of the UCNPs. In addition, the sensing mechanism, characterization of UCNPs, and the selectivity of the fluorescence sensor toward GSH were discussed. The proposed sensor was evaluated on real human serum and urine samples and demonstrated as a highly selective and sensitive probe for the detection of GSH.</P>
Tawfik, Salah M.,Sharipov, Mirkomil,Huy, Bui The,Gerelkhuu, Zayakhuu,Biechele-Speziale, Dana,Lee, Yong-Ill Elsevier 2018 Journal of industrial and engineering chemistry Vol.57 No.-
<P><B>Abstract</B></P> <P>Naturally modified nonionic alginate-based polymers were synthesized to act as functionalizing agents for upconversion nanoparticles (UCNPs). The synthesized polymer-UCNPs hybrid nanoparticles show high stability, excellent biocompatibility and enhanced luminescence intensity for NIR imaging. Additionally, our results show that due to the large cavities of the materials and amphiphilic polymer shell, these nonionic alginate-functionalized UCNPs were able to load the anticancer drug doxorubicin (DOX) with the exceptional efficiency as well as release it in a highly controlled and selective pH-responsive manner via folate receptor-mediated endocytosis. Targeting using this multifunction polymer significantly improved the capability of DOX-loaded UCNPs to inhibit the growth of KB cancer cells than free DOX. These biocompatible nonionic alginate-functionalized UCNPs hold substantial potential as effective anticancer drug-delivery carriers and NIR imaging agents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel biocompatible amphiphilic alginates for functionalizing UCNPs are developed. </LI> <LI> The functionalized-UCNPs possess high stability and less cytotoxicity. </LI> <LI> Functionalized-UCNPs enhanced bioimaging and specific in targeting KB cancer cells. </LI> <LI> Novel UCNP is potentially capable of pH responsive targeted DOX to cancer cell. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>