12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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XPS analysis and luminescence properties of commercially Gd2O2S:Tb powder phosphor

Presented by Dr. JAPPIE DOLO on 13 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track A - Condensed Matter Physics and Material Science

Content

<p>We report on the characterization of commercially terbium doped gadolinium oxysulfide (Gd2O2S:Tb) phosphor and the degradation of the Gd2O2S:Tb green phosphor for its application in CRT screens. As a result, degradation of the cathodoluminescence (CL) intensity during irradiation of the powder with 2 keV electrons in an oxygen pressure of 1 x 10-6 Torr was studied. The ESSCR mechanisms was used to explain the effects of sulphur desorption and the formation of a non-luminescent oxide layer. A dead layer of Gd2O3 and Gd2S3 are responsible for the degradation of the CL intensity with an increase in electron dose. The XPS results have proved the presence of Gd2O3 and Gd2S3 on the degraded powder spots.

Level (Hons, MSc, PhD, other)?

Other

Consider for a student award (Yes / No)?

No

Short Paper

Yes

Place

Location:
Room: Asteria


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