Phosphor particle with antireflection coating

Details Phosphor particle with antireflection coating Phosphor particle with antireflection coating

1998-06-04

1999-06-08

Bell, Jaynce

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

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.

REFERENCES:
patent: 4855189 (1989-08-01), Simpoulos et al.
patent: 4999219 (1991-03-01), Klinedinst et al.
patent: 5049408 (1991-09-01), Klinedinst et al.
patent: 5118529 (1992-06-01), Klinedinst et al.
patent: 5418062 (1995-05-01), Budd
patent: 5433888 (1995-07-01), Okada et al.
patent: 5441774 (1995-08-01), Dutta et al.

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