Phosphor particle with antireflection coating

Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating

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Details

427215, 427255, 4272552, 4272553, 427242, 20419226, 20419222, B05D 506, C23C 1434

Patent

active

059103337

ABSTRACT:
Improved luminous efficiency in plasma displays has been achieved by coating phosphor particles with a dielectric layer having a refractive index, for the ultraviolet light emitted by the plasma, that is intermediate between that of the phosphor and vacuum. When deposited in a thickness range between 0.5 and 5 microns, the layer causes the particle's reflectivity to be reduced because of reduced reflection at the vacuum-coating interface as well as internal reflection at the coating-vacuum interface. For coating thicknesses in the range of 0.1 to 0.5 microns, reflectivity is reduced because of interference between rays reflected at the vacuum-coating interface and the coating-phosphor interface. Several methods for forming these antireflection coatings are described. These include CVD, PVD, and suspension in molten dielectric followed by decanting onto either sticky or non-stick surfaces.

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patent: 5418062 (1995-05-01), Budd
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