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Gas desorption from a field emitter array (FEA) cathode and phosphor screen anode in a flat panel display during a lifetime operation can affect cathode electron emission and degrade display performance and uniformity. We have measured the outgassing products from selected FEA-phosphor pairs in an ultrahigh vacuum system equipped with a calibrated quadrupole rresidual gas analyzer. Different low voltage...
Undoped and Eu3+, Ce3+ and Tb3+-doped YVO4 YPO4, LaPO4 and YVxP1−xO4 were prepared in H2O by the recently introduced hydrolyzed colloid reaction (HCR) technique working at low temperature (<100°C) and atmospheric pressure. Two intermediate — partially hydrophobic — complex colloidal mixtures with metastable characteristics can transform into the stable orthovanadate–orthophosphate phase due to...
Eu 2+ , Dy 3+ and Gd 3+ co-doped strontium aluminate yellow-green phosphor was synthesized by combustion method using urea as reducer at 600°C. The crystallization, particles size and luminescence properties of the sample have been investigated. The results are as follows: Eu 2+ , Dy 3+ and Gd 3+ doped into the phosphor do not change the crystalline...
Molecular organic light-emitting devices (MOLED) and polymer devices (POLED) were fabricated using a novel iridium complex bis[2-(4′-tert-butylphenyl)-1-phenyl-1H-benzoimidazole-N,C 2′ ] iridium (III) (acetylacetonate) phosphor as an emissive dye doped in two different host materials. Electroluminescent (EL) property, current density–voltage–luminance, and current efficiency characteristics...
A new Mn activated Ba co-doped ZnS phosphor shows an interesting shift in the spectral emission from amber-yellow (570nm) to red (620nm) colour. To realize the phosphor material physics, attempts were made to fine tune the band gap of ZnS by co-doping Ba within the concentration range 2.50–10mol%. Ba co-doping in ZnS host was achieved by sintering BaSO 4 with ZnS at 900°C by carbothermal reduction...
A blue organic light-emitting device, based on an iridium phosphorescent dopant in a polyvinylcarbazole host, has been modified by the addition of an external CaS:Eu inorganic phosphor layer. By incorporating a surfactant in the phosphor mixture, a uniform coating could be achieved by drop-casting. The resulting hybrid device exhibited white light emission, with Commission Internationale de l’Eclairage,...
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