Oxidation and diffusion of Cu in SrS : Cu grown by MBE for blue phosphors

摘要

Systematic studies of MBE grown SrS:Cu thin film blue phosphors are reported. It was found that Cu was not oxidized in the as-grown SrS:Cu films. The oxidation and diffusion of Cu during the postgrowth annealing in a H2S atmosphere were identified as the key reasons for the dramatically improved grain size and luminescent properties reported earlier. Experimental evidence of the oxidation states of Cu and the diffusion dynamics of Cu ions in SrS:Cu and SrS:Cu,Mn films will be presented and discussed. (C) 2000 Published by Elsevier Science B.V. References: 7