Optical properties of SrS : Cu,Ag two-component phosphors for electroluminescent devices

The luminescence characteristics of a two-component electroluminescent (EL) phosphor, SrS: Cu, Ag, were investigated by optical spectroscopy. Motivate d by the discovery of efficient EL from SrS: Cu, SrS: Ag was investigated b ut exhibited poor EL emission, even though it showed a superior blue color. Thus, SrS: Cu, Ag samples were prepared in order to investigate if the Ag luminescence could be sensitized to produce a more efficient and saturated blue EL phosphor. A detailed spectroscopic study on SrS: Cu, Ag revealed th at the emission characteristics of SrS: Cu, Ag were identical to SrS: Ag, w hereas the excitation spectra resembled SrS: Cu. These results demonstrated the efficient energy transfer from Cu to Ag, confirming the successful sen sitization. (C) 1999 American Institute of Physics. [S0003-6951(99)00713-5] .