Enhancement of Long-Persistence by Ce Co-Doping in CaS:Eu[sup 2+], Tm[sup 3+] Red Phosphor
- 1 January 2006
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 153 (11), H198-H201
- https://doi.org/10.1149/1.2337087
Abstract
CaS:Eu2+CaS:Eu2+ , CaS:Ce3+CaS:Ce3+ , Na+Na+ , CaS:Eu2+CaS:Eu2+ , Ce3+Ce3+ , CaS:Eu2+CaS:Eu2+ , Tm3+Tm3+ , and CaS:Eu2+CaS:Eu2+ , Ce3+Ce3+ , Tm3+Tm3+ phosphors samples were prepared using a solid state chemical reaction method. Emission and excitation spectra of CaS:Eu2+CaS:Eu2+ (peak emission observed at 648nm648nm ) and CaS:Ce3+CaS:Ce3+ (peak emission observed at 515nm515nm ) were investigated. Neither Eu2+Eu2+ singly doped sample nor Ce3+Ce3+ and Na+Na+ codoped sample had a long afterglow. CaS:Eu2+CaS:Eu2+ , Ce3+Ce3+ showed some afterglow with a short persistence. By incorporation of Ce3+Ce3+ , an efficient energy transfer from Ce3+Ce3+ to Eu2+Eu2+ was found at a low doping concentration 0.1%. Emission intensity of Eu2+Eu2+ was enhanced by 20%. Enhancement of long persistence of Eu2+Eu2+ afterglow emission was achieved by co-doping Ce3+Ce3+ in CaS:Eu2+CaS:Eu2+ , Tm3+Tm3+ as a durable sensitizer. For the triply doped CaS:Eu2+CaS:Eu2+ , Tm3+Tm3+ , Ce3+Ce3+ it was found that the persistence time was 22% longer than that of CaS:Eu2+CaS:Eu2+ , Tm3+Tm3+ .Keywords
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