Luminescence dynamics and concentration quenching in Gd2-xEuxO3 nanophosphor

R. G. Abhilash Kumar, Satoshi Hata, Ken Ichi Ikeda, K. G. Gopchandran

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Gd2-xEuxO3 nanophosphor with enhanced luminescence has been synthesized by solution combustion method in diethylene glycol medium. The effect of Eu3+ content on the structure, morphology and luminescence dynamics has been investigated. The observed red shift in charge transfer band of the nanophosphor with increase in Eu3+content is attributed to the increase in covalency and Eu-O bond length. Excess europium content leads to reduction in intensity of photoemission as a result of concentration quenching. Transient characteristics exhibit single exponential behaviour and the fitted life time values get shortened with increase of Eu3+ content, due to increase in non-radiative transition rate. The observed quenching of luminescence in the phosphor is found to be in agreement with the energy transfer theory proposed by Dexter and Schulman and found that dipole-dipole interaction between Eu3+ ions is the key mechanism responsible for quenching. Critical energy transfer distance between Eu3+ ions in Gd2-xEuxO3 is determined to be 1.148 nm. Judd-Ofelt intensity parameters and the radiative parameters of the phosphors were evaluated from the emission spectrum to analyse the crystal field environment and the degree of covalency between the rare-earth ion and the surrounding ligands. The value of Ω2 intensity parameter confirmed the hypersensitive nature of the 5D0-7F2 transition with larger asymmetry around Eu3+ ions.

Original languageEnglish
Pages (from-to)6037-6050
Number of pages14
JournalCeramics International
Volume41
Issue number4
DOIs
Publication statusPublished - May 1 2015

Fingerprint

Luminescence
Quenching
Ions
Phosphors
Energy transfer
Europium
Bond length
Photoemission
Electron transitions
Glycols
Rare earths
Charge transfer
Ligands
Crystals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Luminescence dynamics and concentration quenching in Gd2-xEuxO3 nanophosphor. / Abhilash Kumar, R. G.; Hata, Satoshi; Ikeda, Ken Ichi; Gopchandran, K. G.

In: Ceramics International, Vol. 41, No. 4, 01.05.2015, p. 6037-6050.

Research output: Contribution to journalArticle

Abhilash Kumar, R. G. ; Hata, Satoshi ; Ikeda, Ken Ichi ; Gopchandran, K. G. / Luminescence dynamics and concentration quenching in Gd2-xEuxO3 nanophosphor. In: Ceramics International. 2015 ; Vol. 41, No. 4. pp. 6037-6050.
@article{d3b2c5caf6e64ea0865698ce99c3450c,
title = "Luminescence dynamics and concentration quenching in Gd2-xEuxO3 nanophosphor",
abstract = "Gd2-xEuxO3 nanophosphor with enhanced luminescence has been synthesized by solution combustion method in diethylene glycol medium. The effect of Eu3+ content on the structure, morphology and luminescence dynamics has been investigated. The observed red shift in charge transfer band of the nanophosphor with increase in Eu3+content is attributed to the increase in covalency and Eu-O bond length. Excess europium content leads to reduction in intensity of photoemission as a result of concentration quenching. Transient characteristics exhibit single exponential behaviour and the fitted life time values get shortened with increase of Eu3+ content, due to increase in non-radiative transition rate. The observed quenching of luminescence in the phosphor is found to be in agreement with the energy transfer theory proposed by Dexter and Schulman and found that dipole-dipole interaction between Eu3+ ions is the key mechanism responsible for quenching. Critical energy transfer distance between Eu3+ ions in Gd2-xEuxO3 is determined to be 1.148 nm. Judd-Ofelt intensity parameters and the radiative parameters of the phosphors were evaluated from the emission spectrum to analyse the crystal field environment and the degree of covalency between the rare-earth ion and the surrounding ligands. The value of Ω2 intensity parameter confirmed the hypersensitive nature of the 5D0-7F2 transition with larger asymmetry around Eu3+ ions.",
author = "{Abhilash Kumar}, {R. G.} and Satoshi Hata and Ikeda, {Ken Ichi} and Gopchandran, {K. G.}",
year = "2015",
month = "5",
day = "1",
doi = "10.1016/j.ceramint.2015.01.051",
language = "English",
volume = "41",
pages = "6037--6050",
journal = "Ceramics International",
issn = "0272-8842",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Luminescence dynamics and concentration quenching in Gd2-xEuxO3 nanophosphor

AU - Abhilash Kumar, R. G.

AU - Hata, Satoshi

AU - Ikeda, Ken Ichi

AU - Gopchandran, K. G.

PY - 2015/5/1

Y1 - 2015/5/1

N2 - Gd2-xEuxO3 nanophosphor with enhanced luminescence has been synthesized by solution combustion method in diethylene glycol medium. The effect of Eu3+ content on the structure, morphology and luminescence dynamics has been investigated. The observed red shift in charge transfer band of the nanophosphor with increase in Eu3+content is attributed to the increase in covalency and Eu-O bond length. Excess europium content leads to reduction in intensity of photoemission as a result of concentration quenching. Transient characteristics exhibit single exponential behaviour and the fitted life time values get shortened with increase of Eu3+ content, due to increase in non-radiative transition rate. The observed quenching of luminescence in the phosphor is found to be in agreement with the energy transfer theory proposed by Dexter and Schulman and found that dipole-dipole interaction between Eu3+ ions is the key mechanism responsible for quenching. Critical energy transfer distance between Eu3+ ions in Gd2-xEuxO3 is determined to be 1.148 nm. Judd-Ofelt intensity parameters and the radiative parameters of the phosphors were evaluated from the emission spectrum to analyse the crystal field environment and the degree of covalency between the rare-earth ion and the surrounding ligands. The value of Ω2 intensity parameter confirmed the hypersensitive nature of the 5D0-7F2 transition with larger asymmetry around Eu3+ ions.

AB - Gd2-xEuxO3 nanophosphor with enhanced luminescence has been synthesized by solution combustion method in diethylene glycol medium. The effect of Eu3+ content on the structure, morphology and luminescence dynamics has been investigated. The observed red shift in charge transfer band of the nanophosphor with increase in Eu3+content is attributed to the increase in covalency and Eu-O bond length. Excess europium content leads to reduction in intensity of photoemission as a result of concentration quenching. Transient characteristics exhibit single exponential behaviour and the fitted life time values get shortened with increase of Eu3+ content, due to increase in non-radiative transition rate. The observed quenching of luminescence in the phosphor is found to be in agreement with the energy transfer theory proposed by Dexter and Schulman and found that dipole-dipole interaction between Eu3+ ions is the key mechanism responsible for quenching. Critical energy transfer distance between Eu3+ ions in Gd2-xEuxO3 is determined to be 1.148 nm. Judd-Ofelt intensity parameters and the radiative parameters of the phosphors were evaluated from the emission spectrum to analyse the crystal field environment and the degree of covalency between the rare-earth ion and the surrounding ligands. The value of Ω2 intensity parameter confirmed the hypersensitive nature of the 5D0-7F2 transition with larger asymmetry around Eu3+ ions.

UR - http://www.scopus.com/inward/record.url?scp=84922601588&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922601588&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2015.01.051

DO - 10.1016/j.ceramint.2015.01.051

M3 - Article

AN - SCOPUS:84922601588

VL - 41

SP - 6037

EP - 6050

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 4

ER -