Skip to main content Accessibility help
×
Home
Hostname: page-component-99c86f546-kpmwg Total loading time: 1.186 Render date: 2021-12-06T12:50:27.541Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Microstructure and Luminescence Properties of ZnS:Cu Powders and Electroluminescent Lamps

Published online by Cambridge University Press:  10 February 2011

Luigi Sangaletti
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, Via Branže, 38 – 25123 Brescia, ITALY
Laura E. Depero
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, Via Branže, 38 – 25123 Brescia, ITALY
Brigida Allieri
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Chimica e Fisica per l'Ingegneria e per i Materiali, Università di Brescia, Via Branže, 38 – 25123 Brescia, ITALY
Livio Antonini
Affiliation:
ELCOM Laboratories, Via Brescia 269, Nave BS, ITALY
Roberto Fantini
Affiliation:
ELCOM Laboratories, Via Brescia 269, Nave BS, ITALY
Marco Bettinelli
Affiliation:
Istituto Policattedra, Università di Verona, Ca’ Vignai, Verona, ITALY
Get access

Abstract

We report on a microscopy and diffraction study of commercially available Cu-doped ZnS powders, along with an optical spectroscopy study of electroluminescent lamps fabricated with these powders. The results allowed us to identify a correlation between the microstructure and the optical properties (i.e. photoluminescence) of the ZnS powders. It is found that the best powders for EL lamps are those displaying a prevalent cubic, i.e. zincblend, structure, while the poor performances of the mixed phase (cubic + hexagonal) are tentatively ascribed to the quenching of luminescence due to defects (stacking faults) introduced into the cubic structure and resulting in a considerable amount of hexagonal phase, as detected by XRD. The mostly cubic powders have been selected to realize EL lamps. The optical properties of these lamps have been investigated by photoluminescence and electroluminescence spectroscopies with the aim to identify the degradation mechanisms leading to a decrease of brightness. The quenching of electroluminescence is primarily ascribed to a deterioration of the electrical contacts. However, the reduced brightness in photoluminescence spectra seems to indicate that additional quenching of luminescence is induced by transformations at the emitting layer of the lamps. This degradation is tentatively ascribed to the presence of voids in the emitting layer, which might induce, acting as traps for moisture, transformations in the optical and electrical properties of the transparent electrode (ITO).

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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

1. Kitai, A. H.. Solid State Electroluminescence. Theory, materials, and devices. Chanman and Hall (London, 1993)Google Scholar
2. Rack, P. D., Naman, A., Holloway, P. H., Sun, S.-S., and Tuenge, R. T., MRS Bulletin 21. 49(1996)CrossRefGoogle Scholar
3. Howard, W. E., Electroluminescent display technologies and their characteristics. Proc. SID, 22, 47 (1981)Google Scholar
4. Bote, P. R., Patii, P. K., Nandagave, J. K., and Lawangar-Pawar, R. D., Solid State Comm. 79, 5 (1991) and Ref. thereinCrossRefGoogle Scholar
5. Arterton, B., Brightwell, J. W., Mason, S., Ray, B., and Viney, I. V. F., Journal of Crystal Growth, 117, 1008(1992)CrossRefGoogle Scholar

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@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 sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent 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.

Microstructure and Luminescence Properties of ZnS:Cu Powders and Electroluminescent Lamps
Available formats
×

Send article to Dropbox

To send 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 use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Microstructure and Luminescence Properties of ZnS:Cu Powders and Electroluminescent Lamps
Available formats
×

Send article to Google Drive

To send 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 use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Microstructure and Luminescence Properties of ZnS:Cu Powders and Electroluminescent Lamps
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? *