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US 6,787,988 B2Granted
Process for treating previously coated phosphor particles
AssigneeDurel Corporation
InventorAlan C. Thomas
Life of this patent
Estimating the term…
Abstract
Particles of electroluminescent phosphor having a moisture proof coating are re-coated by treating the phosphor in a fluidized bed with a mixture of water vapor and an organotrichlorosilane compound for approximately thirty minutes. The resultant siloxane coating further improves the moisture resistance of the phosphor.
Claims10
A method for treating electroluminescent phosphor having a coating of metal oxide, said method comprising the steps of:
- a) providing a fluidized bed of coated electroluminescent phosphor;
- b) vaporizing water in a carrier gas to form a first gas;
- c) vaporizing an organotrichlorosilane compound in a carrier gas to form a second gas;
- d) passing the first gas and the second gas through the fluidized bed to form a siloxane coating on the electroluminescent phosphor.
1 more element
An electroluminescent lamp comprising:
- a transparent electrode;
- a phosphor layer overlying said transparent electrode;
- a dielectric layer overlying said phosphor layer;
- and
- a rear electrode overlying said dielectric layer;
- wherein said phosphor layer includes phosphor particles having a moisture resistant coating and a metal oxide coating overlying each phosphor particle.
3 more elements
A method for treating particles, said method comprising the steps of:
- a) providing a fluidized bed of the particles;
- b) vaporizing water in a first carrier gas to form a first gas mixture;
- c) vaporizing an organotrichlorosilane compound in a second carrier gas to form a second gas mixture;
- d) passing the first gas mixture and the second gas mixture through the fluidized bed to form a siloxane coating on the particles without applying heat to the fluidized bed or to the carrier gases.
1 more element
Dependencies are inferred from the claim text.