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

M. Gunaseelan, S. Yamini, G. A. Kumar, C. Santhosh, J. Senthilselvan

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)366-378
Number of pages13
JournalMaterials Research Bulletin
Publication statusPublished - 01-11-2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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