Defect induced white-light emission from Mn–doped ZnO films and its magnetic properties

H. S. Sindhu, B. V. Rajendra, N. Deepak Hebbar, Suresh D. Kulkarni, P. D. Babu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Thin films of Zn1-xMnxO (where x = 0.01–0.1), a transparent dilute magnetic semiconductor were grown on a glass substrate using cost-effective chemical spray pyrolysis. All films were polycrystalline and most intense XRD peak changed from (0 0 2) at lower x values to (1 0 0) plane for higher doping level. The deposits possessed the fibrous structure up to x = 0.04, a flowered structure for x = 0.05–0.07, and spheroid structure for x = 0.08–0.10, as revealed by SEM. The visible region, optical transmittance systematically changed from 90% to 55%, with increasing dopant concentration. The optical energy band-gap decreased at higher doping levels attributed to the sp–d exchange interactions. The photoluminescence (PL) spectroscopy revealed the presence of various defects which pronounced with increasing Mn%. As a result of multiple defect induced transitions, the PL spectra spanned the entire visible spectrum. Zn.95Mn.05O films showed CIE values with x = 0.333 and y = 0.322, perfectly matching to that of pure white light, with a “Colour Temperature” of 5475 K. The magnetic measurements confirm that the higher Mn-doped films displayed room-temperature ferromagnetism while less doped films showed weak ferromagnetic effects at 5 K.

Original languageEnglish
Pages (from-to)423-432
Number of pages10
JournalJournal of Luminescence
Volume199
DOIs
Publication statusPublished - 01-07-2018

Fingerprint

Light emission
light emission
Magnetic properties
magnetic properties
Light
Defects
Semiconductors
Temperature
defects
Doping (additives)
Glass
Spectrum Analysis
Color
photoluminescence
Costs and Cost Analysis
Magnetic semiconductors
Photoluminescence spectroscopy
Spray pyrolysis
Ferromagnetism
Exchange interactions

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

Cite this

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title = "Defect induced white-light emission from Mn–doped ZnO films and its magnetic properties",
abstract = "Thin films of Zn1-xMnxO (where x = 0.01–0.1), a transparent dilute magnetic semiconductor were grown on a glass substrate using cost-effective chemical spray pyrolysis. All films were polycrystalline and most intense XRD peak changed from (0 0 2) at lower x values to (1 0 0) plane for higher doping level. The deposits possessed the fibrous structure up to x = 0.04, a flowered structure for x = 0.05–0.07, and spheroid structure for x = 0.08–0.10, as revealed by SEM. The visible region, optical transmittance systematically changed from 90{\%} to 55{\%}, with increasing dopant concentration. The optical energy band-gap decreased at higher doping levels attributed to the sp–d exchange interactions. The photoluminescence (PL) spectroscopy revealed the presence of various defects which pronounced with increasing Mn{\%}. As a result of multiple defect induced transitions, the PL spectra spanned the entire visible spectrum. Zn.95Mn.05O films showed CIE values with x = 0.333 and y = 0.322, perfectly matching to that of pure white light, with a “Colour Temperature” of 5475 K. The magnetic measurements confirm that the higher Mn-doped films displayed room-temperature ferromagnetism while less doped films showed weak ferromagnetic effects at 5 K.",
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Defect induced white-light emission from Mn–doped ZnO films and its magnetic properties. / Sindhu, H. S.; Rajendra, B. V.; Hebbar, N. Deepak; Kulkarni, Suresh D.; Babu, P. D.

In: Journal of Luminescence, Vol. 199, 01.07.2018, p. 423-432.

Research output: Contribution to journalArticle

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AU - Babu, P. D.

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