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Material characterisation of SrS:Ce,Mn,Cl films

: Troppenz, U.; Bilger, G.; Bohne, W.; Gers, G.; Kreissl, J.; Mauch, R.-H.; Sieber, K.; Velthaus, K.O.

Mauch, R.H. ; Heinrich-Hertz-Institut für Nachrichtentechnik, Berlin; TU Berlin:
Inorganic and organic electroluminescence : Proceedings of the 8th International Workshop on Electroluminescence to be held from August 13 to 15, 1996 in Berlin, Germany, EL '96 Berlin
Berlin: Wiss. - und Technik-Verl., 1996
ISBN: 3-928943-98-7
International Workshop on Electroluminescence (EL) <8, 1996, Berlin>
Fraunhofer HHI ()
cerium; chlorine; crystal morphology; manganese; paramagnetic resonance; phosphors; rutherford backscattering; secondary ion mass spectra; stoichiometry; strontium compounds; thin films; x-ray diffraction; srs:ce,mn,cl films; el phosphors; xrd; sem; crystallinity; morphology; doping properties; codoping properties; rbs; epr; sims; local distortions; g-value; substrate temperature; cecl3 precursor; srs:ce,mn,cl

Various thin film material characterisation methods are employed to analyse evaporated SrS:Ce,Mn,Cl EL phosphors. Besides the standard techniques like XRD and SEM for crystallinity and morphology inspection the doping and codoping properties are determined by RBS, EPR and SIMS investigations. In particular, the correlation between EPR and RBS data is suited for the evaluation of the Ce doping process. At the optimum Ce-doping concentration for EL operation of 0.1 mol.%, the Ce atoms are entirely incorporated as Ce3+ ions at Sr lattice sites in the SrS host. Introducing codopants like Mn cations the optimum Ce concentration could be increased. However, the incorporation of codopants is accompanied by the formation of local distortions of the octahedral vicinity of Ce3+ indicated by a shift of the g-value in the EPR signals. The stoichiometry as well as the Cl concentration are evaluated using the RBS and SIMS techniques. The Cl incorporation, which cannot be avoided if CeCl3 is taken as a precursor, is shown to depend on the substrate temperature.