Electroluminescence AC powder displays based upon ZnS : Tm, Li

The preparation and characterisation of an inorganic blue-emitting alternat e-current electrolumenescent (ACEL) cell based upon ZnS:Tm, Li phosphor pow der are described. Electroluminescent and photoluminescent spectra clearly show a dominant blue-emission band peaking at 2.6 eV (477 nm) originated fr om (1)G(4)-->H-3(6) transition, Advantages and drawbacks of the powder-base d ACEL cell have been discussed in comparison with a ACEL thin-film based u pon a similar material, The near-infra-red band (801 nm, 1.55 eV, F-3(4)--> H-3(6)) Seen in thin-film structure was significantly suppressed in these t ypes of devices. (C) 1999 Elsevier Science Ltd. All rights reserved.