Nanocrystalline MgCrxAl2-xO4: Facile synthesis and thermal dependency of photoluminescence

Shreekrishna Karthik Shreekrishna, Samvit G. Menon, Deepak Hebbar N., K. S. Choudhari, C. Santhosh, Suresh D. Kulkarni

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

MgCrxAl2-xO4 nanoparticles were synthesized by facile co-precipitation method. The x = 0.02 sample showed intense emission and considered for studying the effect of annealing temperature (500–1200 °C) on the structural and optical properties. On annealing, crystallinity improved and the material gradually turned pink at 1200 °C. Hexagonal sheet-like nanoparticles (∼52 nm) were observed by HRTEM and the lattice fringes suggested their single crystalline nature. Excitation spectra showed two peaks at 546 and 419 nm where the latter was asymmetric, attributable to the trigonal distortion. The photoluminescence consisted of intense zero-phonon line and associated multi-phonon side bands, whose intensities increased with annealing. Higher Dq/B (3.5), confirmed strong crystal field for Cr3+, suggesting that the photoluminescence emission could be associated with spin-parity forbidden transitions. The emission lifetimes (λem = 688 nm) ranged between ∼20 and 24 ms. Other oxide nanoparticles suitable for phosphors, biomarkers, etc. can be conveniently synthesized similarly.

Original languageEnglish
Pages (from-to)513-519
Number of pages7
JournalMaterials Research Bulletin
Volume94
DOIs
Publication statusPublished - 01-10-2017

Fingerprint

Photoluminescence
Annealing
Nanoparticles
photoluminescence
nanoparticles
annealing
synthesis
biomarkers
forbidden transitions
Biomarkers
Coprecipitation
Crystal lattices
Phosphors
Oxides
phosphors
crystal field theory
Structural properties
crystallinity
parity
Optical properties

All Science Journal Classification (ASJC) codes

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

Cite this

@article{5c16d940b8b1495e846a1ddd51133d0a,
title = "Nanocrystalline MgCrxAl2-xO4: Facile synthesis and thermal dependency of photoluminescence",
abstract = "MgCrxAl2-xO4 nanoparticles were synthesized by facile co-precipitation method. The x = 0.02 sample showed intense emission and considered for studying the effect of annealing temperature (500–1200 °C) on the structural and optical properties. On annealing, crystallinity improved and the material gradually turned pink at 1200 °C. Hexagonal sheet-like nanoparticles (∼52 nm) were observed by HRTEM and the lattice fringes suggested their single crystalline nature. Excitation spectra showed two peaks at 546 and 419 nm where the latter was asymmetric, attributable to the trigonal distortion. The photoluminescence consisted of intense zero-phonon line and associated multi-phonon side bands, whose intensities increased with annealing. Higher Dq/B (3.5), confirmed strong crystal field for Cr3+, suggesting that the photoluminescence emission could be associated with spin-parity forbidden transitions. The emission lifetimes (λem = 688 nm) ranged between ∼20 and 24 ms. Other oxide nanoparticles suitable for phosphors, biomarkers, etc. can be conveniently synthesized similarly.",
author = "Shreekrishna, {Shreekrishna Karthik} and Menon, {Samvit G.} and {Hebbar N.}, Deepak and Choudhari, {K. S.} and C. Santhosh and Kulkarni, {Suresh D.}",
year = "2017",
month = "10",
day = "1",
doi = "10.1016/j.materresbull.2017.07.011",
language = "English",
volume = "94",
pages = "513--519",
journal = "Materials Research Bulletin",
issn = "0025-5408",
publisher = "Elsevier Limited",

}

Nanocrystalline MgCrxAl2-xO4 : Facile synthesis and thermal dependency of photoluminescence. / Shreekrishna, Shreekrishna Karthik; Menon, Samvit G.; Hebbar N., Deepak; Choudhari, K. S.; Santhosh, C.; Kulkarni, Suresh D.

In: Materials Research Bulletin, Vol. 94, 01.10.2017, p. 513-519.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nanocrystalline MgCrxAl2-xO4

T2 - Facile synthesis and thermal dependency of photoluminescence

AU - Shreekrishna, Shreekrishna Karthik

AU - Menon, Samvit G.

AU - Hebbar N., Deepak

AU - Choudhari, K. S.

AU - Santhosh, C.

AU - Kulkarni, Suresh D.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - MgCrxAl2-xO4 nanoparticles were synthesized by facile co-precipitation method. The x = 0.02 sample showed intense emission and considered for studying the effect of annealing temperature (500–1200 °C) on the structural and optical properties. On annealing, crystallinity improved and the material gradually turned pink at 1200 °C. Hexagonal sheet-like nanoparticles (∼52 nm) were observed by HRTEM and the lattice fringes suggested their single crystalline nature. Excitation spectra showed two peaks at 546 and 419 nm where the latter was asymmetric, attributable to the trigonal distortion. The photoluminescence consisted of intense zero-phonon line and associated multi-phonon side bands, whose intensities increased with annealing. Higher Dq/B (3.5), confirmed strong crystal field for Cr3+, suggesting that the photoluminescence emission could be associated with spin-parity forbidden transitions. The emission lifetimes (λem = 688 nm) ranged between ∼20 and 24 ms. Other oxide nanoparticles suitable for phosphors, biomarkers, etc. can be conveniently synthesized similarly.

AB - MgCrxAl2-xO4 nanoparticles were synthesized by facile co-precipitation method. The x = 0.02 sample showed intense emission and considered for studying the effect of annealing temperature (500–1200 °C) on the structural and optical properties. On annealing, crystallinity improved and the material gradually turned pink at 1200 °C. Hexagonal sheet-like nanoparticles (∼52 nm) were observed by HRTEM and the lattice fringes suggested their single crystalline nature. Excitation spectra showed two peaks at 546 and 419 nm where the latter was asymmetric, attributable to the trigonal distortion. The photoluminescence consisted of intense zero-phonon line and associated multi-phonon side bands, whose intensities increased with annealing. Higher Dq/B (3.5), confirmed strong crystal field for Cr3+, suggesting that the photoluminescence emission could be associated with spin-parity forbidden transitions. The emission lifetimes (λem = 688 nm) ranged between ∼20 and 24 ms. Other oxide nanoparticles suitable for phosphors, biomarkers, etc. can be conveniently synthesized similarly.

UR - http://www.scopus.com/inward/record.url?scp=85024860082&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85024860082&partnerID=8YFLogxK

U2 - 10.1016/j.materresbull.2017.07.011

DO - 10.1016/j.materresbull.2017.07.011

M3 - Article

AN - SCOPUS:85024860082

VL - 94

SP - 513

EP - 519

JO - Materials Research Bulletin

JF - Materials Research Bulletin

SN - 0025-5408

ER -