Photon upconversion characteristics of intense green emitting BaYF5:Yb3+,Er3+ nanoclusters prepared by reverse microemulsion

Kumar, GA and Santhosh, C (2018) Photon upconversion characteristics of intense green emitting BaYF5:Yb3+,Er3+ nanoclusters prepared by reverse microemulsion. Materials Research Bulletin, 107 (1). pp. 366-378. ISSN 0025-5408

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Abstract

This work presents the first time synthesis of photon upconverting cubic BaYF5:Yb3+,Er3+ nanoclusters by a novel reverse microemulsion method. Rietveld refinement analysis confirmed the cubic BaYF5 and BaYF5: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 BaYF5: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 BaYF5:Yb,Er were investigated against human colon adenocarcinoma cell line (HT29 cells) for 24 h and 48 h treatment.

Item Type: Article
Uncontrolled Keywords: Upconversion; Nanomaterials; Energy transfer; Fluorides; Lanthanides; Microemulsion
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 23 Nov 2018 06:19
Last Modified: 23 Nov 2018 06:19
URI: http://eprints.manipal.edu/id/eprint/152341

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