Skip to main content Accessibility help
×
Home
Hostname: page-component-846f6c7c4f-tkmnj Total loading time: 0.337 Render date: 2022-07-06T15:48:50.344Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "useRatesEcommerce": false, "useNewApi": true } hasContentIssue true

Crystal structure of quenched and in-field electroluminescent phosphors

Published online by Cambridge University Press:  30 September 2010

G. R. Fern*
Affiliation:
Centre for Phosphors and Display Materials, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
T. Ireland
Affiliation:
Centre for Phosphors and Display Materials, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
P. Harris
Affiliation:
Centre for Phosphors and Display Materials, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
J. Silver
Affiliation:
Centre for Phosphors and Display Materials, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
R. Withnall
Affiliation:
Centre for Phosphors and Display Materials, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
A. Salimian
Affiliation:
Centre for Phosphors and Display Materials, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
P. K. Santra
Affiliation:
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
M. Leoni
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano, 77, 38123 Trento, Italy
A. Erko
Affiliation:
Elektronenspeicherring BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
A. Lennie
Affiliation:
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
C. C. Tang
Affiliation:
Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
*
Email address for correspondence: George.Fern@brunel.ac.uk
Get access

Abstract

Electroluminescent zinc sulfide doped with copper and chloride (ZnS:Cu, Cl) powder was heated to 400°C and rapidly quenched to room temperature. Comparison between the quenched and non-quenched phosphors using synchrotron radiation X-ray powder diffraction (XRPD) (λ = 0.828692 Å) and X-ray absorption spectroscopy (XAS) was made. XRPD shows that the expected highly faulted structure is observed with excellent resolution out to 150° 2θ (or to (12 2 2) of the sphalerite phase). The quenched sample compared to the unheated sample shows a large change in peak ratios between 46.7° and 46.9°, which is thought to correspond to the wurtzite (0 0 6), (0 3 2) and sphalerite (3 3 3)/(5 1 1) peaks. Hence, a large proportion of this sphalerite diffraction is lost from the material upon rapid quenching, but not when the material is allowed to cool slowly. The Zn K-edge XAS data indicate that the crystalline structures are indistinguishable using this technique, but do give an indication that the electronic structure has altered due to changing intensity of the white line. It is noted that the blue electroluminescence (EL) emission bands are lost upon quenching: however, a large amount of total EL emission intensity is also removed, which is consistent with our findings. We report the XRPD of a working alternating-current electroluminescence device in the synchrotron X-ray beam, which exhibits a new diffraction pattern when the device is powered in an AC field even though the phosphor is fixed in the binder. Significantly, only a few crystals are required to yield the diffraction data because of the high flux X-ray source. These in panel data show multiple sharp diffraction lines spread out under the region, where capillary data show broad diffraction intensity indicating that the phosphor powder is comprised of unique crystals, each having different structures.

Type
Poster paper
Copyright
Copyright © Diamond Light Source Ltd 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bredol, M. & Dieckhoff, H. S. 2010 Materials for powder-based AC-electroluminescence. Materials 3, 13531374.CrossRefGoogle Scholar
McKeag, A. H. & Steward, E. G. 1957 Effect of crystal disorder on the electroluminescence of zinc sulfide phosphors. J. Electrochem. Soc. 104, 4145.CrossRefGoogle Scholar
Short, M. A., Steward, E. G. & Tomlinson, T. B. 1956 Electroluminescence in disordered zinc sulphide. Nature 177, 240.CrossRefGoogle Scholar
Silver, J., Withnall, R., Fern, G. R., Marsh, P. J., Ireland, T. G. & Salimian, A. 2006 Correlating the ACEL performance of Phosphor Powders ZnS:Cu,X (X = Cl, Br) with their charge trap characteristics. International Display Workshop, 6–8 December 2006, Otsu, Japan.Google Scholar
Stanley, J., Jiang, Y., Bridges, F., Carter, S. A. &. Ruhlen, L. 2010 Degradation and rejuvenation studies of AC electroluminescent ZnS:Cu,Cl phosphors. J. Phys.: Condens. Matter 22, 055301.Google ScholarPubMed
Thompson, S. P., Parker, J. E., Potter, J., Hill, T. P., Birt, A., Cobb, T. M., Yuan, F. & Tang, C. C. 2009 Beamline I11 at Diamond: a new instrument for high resolution powder diffraction. Rev. Sci. Instrum. 80, 075107.CrossRefGoogle ScholarPubMed
1
Cited by

Save article to Kindle

To save this article to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Crystal structure of quenched and in-field electroluminescent phosphors
Available formats
×

Save article to Dropbox

To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.

Crystal structure of quenched and in-field electroluminescent phosphors
Available formats
×

Save article to Google Drive

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

Crystal structure of quenched and in-field electroluminescent phosphors
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *