Blue light emitting Y2O3:Tm3+ nanophosphors with tunable morphology obtained by bio-surfactant assisted sonochemical route

K N Venkatachalaiah; H Nagabhushana; G P Darshan; R B Basavaraj; B Daruka Prasad; S C Sharma

doi:10.1016/j.saa.2017.04.033

Blue light emitting Y₂O₃:Tm³⁺ nanophosphors with tunable morphology obtained by bio-surfactant assisted sonochemical route

Spectrochim Acta A Mol Biomol Spectrosc. 2017 Sep 5:184:89-100. doi: 10.1016/j.saa.2017.04.033. Epub 2017 Apr 20.

Authors

K N Venkatachalaiah¹, H Nagabhushana², G P Darshan³, R B Basavaraj⁴, B Daruka Prasad⁵, S C Sharma⁶

Affiliations

¹ Department of Physics, Amrita School of Engineering, Amrita Vishwavidyapeetham, Amrita University, Bengaluru 560035, India; Research and Development Center, Bharathiar University, Coimbatore 641046, India.
² Prof. C N R Rao Centre for Advanced Material Science, Tumakuru University, Tumakuru 572103, India. Electronic address: bhushanvlc@gmail.com.
³ Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India.
⁴ Prof. C N R Rao Centre for Advanced Material Science, Tumakuru University, Tumakuru 572103, India.
⁵ Department of Physics, B.M.S. Institute of Technology and Management, VTU affiliated, Bengaluru 560 064, India. Electronic address: darukap@bmsit.in.
⁶ Department of Mechanical Engineering, Jain University, Jain group of Institutions, Bangalore 560069, India; Avinashilingam University for Women, Coimbatore 641043, Tamil Nadu, India.

PMID: 28486204
DOI: 10.1016/j.saa.2017.04.033

Abstract

Modified sonochemical route was used to prepare Y₂O₃:Tm³⁺ (1-11mol%) nanophosphor using Mimosa pudica (M.P.) leaves extract as bio-surfactant. The prepared samples were exhibited high crystalline nature with various morphologies. This was due to sonochemical experimental reaction took place between cavitation bubbles and nearby solution. The average crystallite sizes of the prepared samples were about 15nm to 21nm as obtained from PXRD and TEM analysis. The ultraviolet visible absorption spectra showed prominent bands with an energy gap varied from 5.73eV to 5.84eV. Photoluminescence (PL) emission spectra shows the prominent blue light emission peak at ~456nm attributed to ¹D₂→³F₄ transitions of Tm³⁺ ions. Judd-Ofelt intensity parameters were estimated by using PL emission spectra. The photometric characteristics of the prepared compounds were very close to the blue color of NTSC standards. So the results were fruitful in making use of Y₂O₃:Tm³⁺ nanophosphor as an alternative material for effective blue component in WLED's.

Keywords: Judd – Ofelt analysis; Mimosa pudica; Photoluminescence; Sonochemical method.

MeSH terms

Luminescent Agents / chemistry*
Mimosa / chemistry
Nanoparticles / chemistry*
Photochemical Processes
Plant Leaves / chemistry*
Sonication
Surface-Active Agents / chemistry*
Surface-Active Agents / isolation & purification
Yttrium / chemistry*

Substances

Luminescent Agents
Surface-Active Agents
Yttrium
yttria