Photon upconversion characteristics of intense green emitting BaYF5:Yb3+,Er3+ nanoclusters prepared by reverse microemulsion
- Department of Nuclear Physics, University of Madras, Chennai 600025, Tamil Nadu (India)
- Department of Physics and Astronomy, University of Texas at San Antonio, TX 78249 (United States)
- Department of Atomic and Molecular Spectroscopy, Manipal University, Manipal 576104 (India)
Highlights: • First-time synthesis of BaYF{sub 5}:Yb{sup 3+},Er{sup 3+} nanocluster by reverse microemulsion. • Intense Green upconversion emission under 980 nm excitation. • Proposed a mechanism for nanocluster formation based on XRD, FTIR and HRTEM results. • X-ray Rietveld refinement conformation on the formation of cubic BaYF{sub 5}. • BaYF{sub 5}:Yb{sup 3+},Er{sup 3+} nanocluster exhibited significant the cell viability against HT29 cells. - Abstract: This work presents the first time synthesis of photon upconverting cubic BaYF{sub 5}:Yb{sup 3+},Er{sup 3+} nanoclusters by a novel reverse microemulsion method. Rietveld refinement analysis confirmed the cubic BaYF{sub 5} and BaYF{sub 5}:Yb,Er. The spherical nanoclusters (∼35 nm) are formed by an ensemble of ∼10 nm individual nanocrystals. A plausible formation mechanism is explained based on HRSEM and HRTEM investigations. FTIR revealed the effect of CTAB and oleic acid surfactants on amine and carboxyl functionalization. The cubic BaYF{sub 5}:Yb,Er nanoclusters exhibited an intense green upconversion emission under 980 nm excitation. A three-fold upconversion green emission enhancement was achieved by increasing the calcination temperature from 200 °C to 400 °C. The energy transfer mechanism is described based on pump power dependent upconversion luminescence intensity. Furthermore, cytotoxicity effect of the different concentrations (2.5–300 μg/mL) of the BaYF{sub 5}:Yb,Er were investigated against human colon adenocarcinoma cell line (HT29 cells) for 24 h and 48 h treatment.
- OSTI ID:
- 22805319
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 107; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
77 NANOSCIENCE AND NANOTECHNOLOGY
AMINES
BARIUM COMPOUNDS
CALCINATION
CARCINOMAS
CONCENTRATION RATIO
ENERGY TRANSFER
ERBIUM IONS
EXCITATION
FOURIER TRANSFORM SPECTROMETERS
INFRARED SPECTRA
LARGE INTESTINE
LUMINESCENCE
MICROEMULSIONS
NANOMATERIALS
NANOSTRUCTURES
OLEIC ACID
PHOTOEMISSION
PHOTONS
SYNTHESIS
TOXICITY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTERBIUM IONS