PDP fluorescent powder pulp for spraying and preparation thereof

Abstract

The invention relates to PDP fluorescent powder slurry used for coating and a preparation method thereof. The slurry is prepared by the following materials according to a weight percentage: 30 to 40 percent of PDP fluorescent powder, 3 to 10 percent of cellulose, 10 to 20 percent of ethyl acetate or butyl acetate, 30 to 50 percent of good solvent of the cellulose, 5 to 10 percent of anti-settling agent, 0.1 to 2 percent of silicones dispersant as well as 0.1 to 2 percent of silicones foam killer. The invention improves the defects that the PDP fluorescent powder in the existing PDP fluorescent powder slurry used for coating can generate settlement which causes the fluorescent powder to be seriously deposited and is incapable of ensuring the fluorescent powder to be uniformly distributed in a carrier even if an external force is used for stirring, thus causing the coating technique to be hardly carried out and leading the storage time of the PDP fluorescent powder slurry used for coating to be prolonged. The invention improves the lopping performance of the PDP slurry used for coating; the slurry coated in the slots between barriers is better adhered on the side surfaces of the barriers to form a uniform fluorescent layer, thereby forming a uniform and compact fluorescent powder layer with proper thickness on the inner surrounding walls and the bottom parts of the barriers.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials and displays, and in particular relates to a PDP rare earth fluorescent powder slurry for spraying and a preparation method thereof. Background technique [0002] Due to the shortcoming of stretching of the screen mask, the screen printing technology gradually fails to meet the precision requirements of the PDP display screen. Although some researchers have made certain improvements to the screen printing technology, they still cannot achieve satisfactory results. The spraying method is to pressurize the phosphor slurry, while continuously spraying the slurry from the nozzle, while adjusting the position of the nozzle and the spraying amount of the slurry according to the position information, so as to ensure the coating accuracy. Compared with screen printing technology, the spraying method adopts the position scanning system, which can adjust the spraying speed, pressur...

AI Technical Summary

Problems solved by technology

[0005] 1. The PDP phosphor in the slurry will settle and lead to serious deposition of the PDP phosphor. The use of external stirring cannot ensure that the phosphor can be evenly distributed in the carrier, making it difficult for the spraying process to proceed smoothly;

[0006] 2. If the particle size distribution of the powder is not concentrated, the coarser particles can easily cause nozzle blockage and interrupt the spraying process;

[0007] 3. Due to the low viscosity of the slurry, the slurry coated in the groove between the barrier walls has poor hanging performance, and it is difficult to adhere well to the side of the barrier wall to form a balanced phosphor layer