Phosphor and method of making same
AssigneeMotorola, Inc.
InventorRonald O. Petersen
Life of this patent
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Abstract
A phosphor (200) for low voltage applications including a plurality of light-emitting particles (10) being made from a UV-excitable light-emitting phosphor, a diffusion barrier (25) being formed as a film on the light-emitting particles (10), and a coating (30) of an electron-excitable UV-emitting material being formed on the diffusion barrier (25). A method for making a low voltage phosphor including the steps of (i) providing a UV-excitable light-emitting phosphor (ii) forming a diffusion barrier on the UV-excitable light-emitting phosphor via sol-gel techniques (iii) forming, via sol-gel techniques, a film of an electron-excitable UV-emitting material on the diffusion barrier.
Claims14
A method for making a phosphor comprising the steps of:
- providing a particle of a UV-excitable light-emitting phosphor, the particle having an outer surface;
- and
- coating the outer surface of the particle with an electron-excitable UV-emitting material.
A method for making a phosphor comprising the steps of:
- providing a UV-excitable light-emitting phosphor;
- and
- utilizing sol-gel techniques to form an electron-excitable UV-emitting material on the UV-excitable light-emitting phosphor.
A method for making a phosphor comprising the steps of:
- providing a UV-excitable light-emitting phosphor;
- providing salts of the elements Ga, Zn, and Gd, such that the molar ratios of Ga to Zn to Gd are within a range of about 2:(0.5-4):(5.times.10.sup.-4 -0.3);
- dissolving the salts in water to provide a first solution;
- adding glycine to the first solution;
- adding a 2:1 mixture of urea and carbohydrazide to the solution to provide a final solution;
- heating the final solution gently thereby driving off water and increasing the viscosity of the final solution to provide a viscous solution;
- forming on the UV-excitable light-emitting phosphor a film of the viscous solution thereby providing a coated material;
- and
- heating the coated material in an over to a temperature in a range of 300.degree.-1000.degree. C. thereby crystallizing and activating the film.
A method for making a phosphor comprising the steps of:
- providing a UV-excitable light-emitting phosphor;
- forming on the UV-excitable light-emitting phosphor a diffusion barrier;
- and
- forming an electron-excitable UV-emitting material on the diffusion barrier.
A method for making a phosphor comprising the steps of:
- providing a UV-excitable light-emitting phosphor;
- forming on the UV-excitable light-emitting phosphor an electron-excitable UV-emitting material;
- and
- thereafter, forming on the electron-excitable UV-emitting material a thin conductive coating.
Dependencies are inferred from the claim text.