Study of blue emitting electroluminescent devices

Liew, S.C., 2003. Study of blue emitting electroluminescent devices. PhD, Nottingham Trent University.

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Abstract

The main aim for this work is to enhance the luminescent efficiency of the blue emitting SrS;Cu,Ag thin films. The initial phase of the study was to establish suitable parameters for the fabrication of SrS:Cu,Ag thin films utilising the rf magnetron sputter deposition technique. Conventional thermal based post deposition annealing, although found capable of improving the photoluminescence properties of the resulting SrS:Cu,Ag films, was however not suitable for the electroluminescence study of these films. In order to avoid this high temperature process, extensive experiments of an alternative form of annealing utilising laser pulse irradiation was carried out. The laser utilized for the investigation was a KrF laser at the Central Laser Facility at the Rutherford Appleton Laboratory. Optimization of the laser annealing process found that the effect of laser annealing SrS:Cu,Ag thin films was highly dependant on the laser fluence and the number of laser irradiation pulses. Laser annealed devices were found to electrically luminesce by a factor of 3 over conventional thermally annealed devices. The study of improving the luminescent properties by structure modification was also carried out by incorporating a thin insulating layer within the phosphor layer of the ACTFEL structure. These barrier layer devices were found to enhance the overall luminance of the device by improving the impact ionization mechanism of SrS:Cu,Ag ACTFEL devices. The detailed study of laser annealing and barrier layer devices has lead to the potential commercial fabrication of an ACTFEL device with the benefit of barrier layer characteristic but without the need of incorporating the crucial thin insulating layer within the phosphor layer.

Item Type:	Thesis
Creators:	Liew, S.C.
Date:	2003
ISBN:	9781369324952
Identifiers:	Number Type PQ10290246 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	24 Jun 2021 10:31
Last Modified:	26 Oct 2023 08:53
URI:	https://irep.ntu.ac.uk/id/eprint/43197

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