Abstract: A pixel sub-structure for an electroluminescent display and a method for making the same. The sub-structure comprising: a colour conversion layer; and an optical enhancement layer; wherein at least a portion of the colour conversion layer is integrated with at least a portion of the optical enhancement layer.

Abstract: The present invention is directed to color electroluminescent displays comprising a novel sub-pixel structure and method for making the same. The sub-pixel structure has an electroluminescent phosphor, which emits blue light, and a photoluminescent phosphor, which emits at least one other color as a result of absorption of the blue light. The invention is also directed to novel photoluminescent phosphor materials.

Abstract: An improved color-converting photoluminescent film that provides visible light emission in the red to green portion of the visible spectrum when excited by blue light. The color-converted photoluminescent film of the invention is patternable and has improved luminous efficiency and stability and is suitable for use in electroluminescent displays. The film comprises a mixture of a clear UV curable resin and photo-initiator which does not absorb blue light; and fluorescent pigment particles, wherein a molecular additive is optionally provided in to either or both of the pigment particles and curable resin. The mixture is screen printed onto a substrate to form a film and UV cured.

Abstract: The present invention is a method for gettering undesirable atomic species from a vaporizing atmosphere during deposition of multi-element thin film phosphor compositions. The method comprises vaporizing one or more getter species immediately prior and/or simultaneously during the deposition of a phosphor film composition within a deposition chamber. The method improves the luminance and emission spectrum of phosphor materials used for full colour ac electroluminescent displays employing thick film dielectric layers with a high dielectric constant.

Abstract: A thin film phosphor for an electroluminescent device, the phosphor being a compound of the formula MgxCa1−xAl2S4:M, where the value of x is in the range 0<x<0.3 and M is a rare earth activator. A method for the preparation of the phosphor on a substrate is also disclosed.

Abstract: A thin film phosphor for an electroluminescent device, in which the phosphor is selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor is activated by a rare earth metal and co-activated with gadolinium. The phosphor provides improved luminance. An electroluminescent device comprising the thin film phosphor on a substrate is also described. Further aspects provide an electroluminescent device in which the thin film phosphor is adjacent to a thin film of zinc sulphide, preferably sandwiched between thin films of zinc sulphide.

Abstract: A thin film phosphor for an electroluminescent device, and the electroluminescent device. The phosphor comprises a compound of the formula MgxCa1-xAl2S4:M, where the value of x is in the range 0<x<0.3 and M is a rare earth activator. Preferably, the value of x is in the range 0.05<x<0.20. A thin film phosphor for an electroluminescent device, the phosphor comprising magnesium calcium thioaluminate activated with a rare earth metal, the calcium thioaluminate containing an amount of magnesium to effect a lowering of the temperature of deposition of the phosphor on a substrate. A method for the preparation of the phosphor on a substrate, said method comprising the steps of: (i) depositing a mixtures of sulphides of magnesium, calcium, aluminum and rare earth metal on a substrate, and (ii) annealing the mixture of sulphides on the substrate so as to form the phosphor. The mixture of sulphides may be deposited on the substrate at a temperature of not greater than 200° C.

Abstract: A thin film phosphor for an electroluminescent device, in which the phosphor is selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor is activated by a rare earth metal and co-activated with gadolinium. The phosphor provides improved luminance. An electroluminescent device comprising the thin film phosphor on a substrate is also described. Further aspects provide an electroluminescent device in which the thin film phosphor is adjacent to a thin film of zinc sulphide, preferably sandwiched between thin films of zinc sulphide.