12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

XPS analysis and luminescence properties of commercially Gd2O2S:Tb powder phosphor

13 Jul 2011, 17:00


Poster Presentation Track A - Condensed Matter Physics and Material Science Poster1


Dr JAPPIE DOLO (University of the free state)


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.

Consider for a student <br> &nbsp; award (Yes / No)? No
Level (Hons, MSc, <br> &nbsp; PhD, other)? Other
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes

Primary author

Dr JAPPIE DOLO (University of the free state)


Prof. Hendrik Swart (UFS)

Presentation Materials