SU834098A1 - Method of producing pigmented red-glow luminophor - Google Patents

Description

The invention is applied to luminescence technology, in particular, to processes for obtaining phosphors based on rare-earth elements, for example, a red glow, used in the electronics industry for color television. In modern production of kinescopes for color television, sulphide phosphors with blue and green luminescence and phosphors based on rare earth elements of red luminescence 1 are used. A method of producing pigmented (dyed.) Phosphors by fixing the pigment particles on the surface of the phosphor particles using i organic binder - latex. While stirring the corresponding components for 16 hours, then adding to the mixture solutions of aluminum nitrate and ammonia to form an insoluble compound, and then washing the pigmented product by decantation from foam. The disadvantage of this method lies in the duration of the process (up to 2Oh) in the large consumption of demineralized water for washing the phosphor and in the insufficient brightness of the last presence of the inorganic binder Ae (he) 3. There is also known a method for producing pigmented red phosphors of the luminescence color, for example, based on the rare earth element yttrium, which involves the preparation of an aqueous suspension and pigment in the salt of pyrophosphate, mixing it with a phosphor in the presence of precipitation. giving the agent forming an insoluble compound with pyrophosphate, followed by filtering the suspension mixture and drying the separated sediment. The 3rd Danny method also does not provide sufficient phosphor {because of the use of an inorganic binder in the deposition of pigment on the particles

Claims (3)

Claim 1. A method of producing a pigmented red phosphor of a glow based on rare-earth elements, comprising mixing a phosphor with a suspension of a pigment in a solution of salts of polyphosphoric acids, filtering the resulting mixture and drying the separated precipitate, characterized in that, in order to increase the brightness of the phosphor and the strength of fixing on its surface pigment coating, the initial phosphor before mixing with a suspension of the pigment is treated with a solution of a fluorine-containing compound. , 2. The method according to π. 1, characterized in that as a fluorine-containing compound, hydrogen fluoride or ammonium fluoride is used in an amount of 0.1-5.0 wt.%. < 3. The method of pop. 1, characterized in that the solution of salts of polyphosphoric acids is taken with a concentration of 0.01 to 5.0 wt.%.