Publication detail

Electroluminescence brightness and luminous efficiency of ZnS:Mn doped with KCl

AHMED, M.

Original Title

Electroluminescence brightness and luminous efficiency of ZnS:Mn doped with KCl

English Title

Electroluminescence brightness and luminous efficiency of ZnS:Mn doped with KCl

Type

conference paper

Language

en

Original Abstract

The electroluminescence (EL) characteristics of ZnS:Mn doped with KCl for alternating current thin film electroluminescent devices deposited by a RF sputter system from ZnS and Mn targets are investigated. Measurement of EL brightness and luminous efficiency was carried out. K is uniformly distributed through the 1 micrometer ZnS film after 5 minutes anneals at T > 600 degreeC, while Cl requires an anneal at T > 700 degreeC before diffusion results in a uniform concentration. Upon annealing at 700 degreeC for 5 minutes, the equiaxed grains were consumed by growth of the columnar grains, and growth of the columnar grain diameter is enhanced by the presence of KCl. The mixed cubic and hexagonal atomic stacking observed in as-deposited films became more cubic upon annealing with KCl co-dopants. K+ diffuses by an interstitial mechanism and it occupies an interstitial site in the cubic structure where it acts as a donor, similar to substitutional Cl- ZnS:Mn co-doped with KCl shows significant improvement in EL brightness and luminous efficiency. It was concluded that the improved EL properties result from both improved crystallinity and modification of point defects and space charge in the ZnS:Mn, KCl films.

English abstract

The electroluminescence (EL) characteristics of ZnS:Mn doped with KCl for alternating current thin film electroluminescent devices deposited by a RF sputter system from ZnS and Mn targets are investigated. Measurement of EL brightness and luminous efficiency was carried out. K is uniformly distributed through the 1 micrometer ZnS film after 5 minutes anneals at T > 600 degreeC, while Cl requires an anneal at T > 700 degreeC before diffusion results in a uniform concentration. Upon annealing at 700 degreeC for 5 minutes, the equiaxed grains were consumed by growth of the columnar grains, and growth of the columnar grain diameter is enhanced by the presence of KCl. The mixed cubic and hexagonal atomic stacking observed in as-deposited films became more cubic upon annealing with KCl co-dopants. K+ diffuses by an interstitial mechanism and it occupies an interstitial site in the cubic structure where it acts as a donor, similar to substitutional Cl- ZnS:Mn co-doped with KCl shows significant improvement in EL brightness and luminous efficiency. It was concluded that the improved EL properties result from both improved crystallinity and modification of point defects and space charge in the ZnS:Mn, KCl films.

Keywords

Electroluminescence, brightness,luminous efficiency, ZnS:Mn, KCl

RIV year

2007

Released

26.04.2007

Publisher

Ing. Zdeněk Novotný, CSc., Ondráčkova 105, Brno

Location

Brno

ISBN

978-80-214-3409-7

Book

Proceedings of the 13th Conference STUDENT EEICT 2007

Edition

vol. 3

Pages from

210

Pages to

214

Pages count

5

BibTex


@inproceedings{BUT22601,
  author="Mustafa M. Abdalla {Ahmed}",
  title="Electroluminescence brightness and luminous efficiency of ZnS:Mn doped with KCl",
  annote="The electroluminescence (EL) characteristics of ZnS:Mn doped with KCl for alternating current thin film electroluminescent devices deposited by a RF sputter system from ZnS and Mn targets are investigated. Measurement of EL brightness and luminous efficiency was carried out.  K is uniformly distributed through the 1 micrometer ZnS film after 5 minutes anneals at T > 600 degreeC, while Cl requires an anneal at T > 700 degreeC before diffusion results in a uniform concentration. Upon annealing at 700 degreeC for 5 minutes, the equiaxed grains were consumed by growth of the columnar grains, and growth of the columnar grain diameter is enhanced by the presence of KCl. The mixed cubic and hexagonal atomic stacking observed in as-deposited films became more cubic upon annealing with KCl co-dopants.  K+ diffuses by an interstitial mechanism and it occupies an interstitial site in the cubic structure where it acts as a donor, similar to substitutional Cl- ZnS:Mn co-doped with KCl shows significant improvement in EL brightness and luminous efficiency. It was concluded that the improved EL properties result from both improved crystallinity and modification of point defects and space charge in the ZnS:Mn, KCl films.",
  address="Ing. Zdeněk Novotný, CSc., Ondráčkova 105, Brno",
  booktitle="Proceedings of the 13th Conference STUDENT EEICT 2007",
  chapter="22601",
  edition="vol. 3",
  institution="Ing. Zdeněk Novotný, CSc., Ondráčkova 105, Brno",
  year="2007",
  month="april",
  pages="210--214",
  publisher="Ing. Zdeněk Novotný, CSc., Ondráčkova 105, Brno",
  type="conference paper"
}