Application Areas and Phosphors Used

In plasma display panels, the most severe energy loss is encountered in the discharge. This is a consequence of the small dimensions of the picture elements (pixels). The phosphors used have been known for a long hme. The operahonal lifetime of the blue emitting phosphor still poses a problem. 

X-ray phosphors are also used in X-ray intensifying screens. The X-rays are first converted into visible photons, which subsequently irradiate the film. In most cases, the photographic film is sandwiched between two phosphor sheets. Light moving into the direction away from the photographic film can nevertheless be used by application of Ti02 reflecting layers. The typical thickness of such a phosphor layer is of the order of a few hundred micrometers. 

Energy Efficienqr Considerations of Important Luminescent Devices 

Device Cathode-ray tube Plasma display panel Fluorescent lamp Phosphor-converted LED lamp 

Major energy Shadow mask Discharge 90 Phosphors 55 LED 70 

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