Process for producing SrAl2O4:Eu,Dy long afterglow luminescent material

Abstract

The invention relates to the field of luminescent materials, in particular to a preparation method of SrAl2O4:Eu<2+> and Dy<3+> long afterglow luminescent materials. The preparation method comprises the following steps: taking Al(NO3)3.9H2O, Sr(NO3)2, Eu2O3 and Dy2O3 as raw materials, H3BO3 as a fluxing agent, CO(NH2)2 as fuel, and oxalic acid as a precipitator, adjusting the pH value of mixed liquor by ammonia water; then placing the mixed liquor into a burning reaction furnace; lighting at the temperature of 500 to 800 DEG C to carry out combustion reaction; and finally obtaining the SrAl2O4:Eu<2+> and Dy<3+> long afterglow luminescent materials. The preparation method has the advantages of quick reaction, simple process, saved time and energy; the illuminant performance of the combined product is excellent; the initial illuminant brightness can achieve 19150 mcd/m<2>; and the afterglow time can achieve 216 h simultaneously.

Description

(1) Technical field: [0001] The invention relates to the field of luminescent materials, in particular to a SrAl 2 O 4 :Eu 2+ , Dy 3+ Preparation method of long afterglow luminescent material. (2) Background technology: [0002] SrAl 2 O 4 :Eu 2+ , Dy 3+ Long afterglow luminescent materials have the advantages of high luminous brightness, long afterglow time, and no radioactive elements. They are widely used in various low-light lighting and special indication fields, such as luminous paint for highways and airports, and dials of luminous clocks. , Warning signs of dangerous places, indication signs of evacuation routes, display and decoration of hotels, shopping centers and other fields. [0003] SrAl 2 O 4 :Eu 2+ , Dy 3+ The preparation method of long afterglow luminescent materials is the most mature high-temperature solid-phase method, and the prepared materials have the best performance. Industrial production has been realized. For example, the brightness of the special lumi...

AI Technical Summary

Problems solved by technology

However, the high-temperature solid-phase method needs to be burned at a high temperature above 1300°C for several hours, and has the following disadvantages: high requirements for equipment, cumbersome process, long production cycle, and high labor intensity; particles are easy to agglomerate and need to be crushed to reduce the particle size , so that the lattice of the luminous body is destroyed, and the luminous performance is greatly reduced; the energy consumption is high, the loss of rare earth materials in the production process is large, and the cost remains high

However, the luminescent material prepared by this method has the problems of low luminescence brightness and short afterglow time [TianyouPeng, Huanping Yang, Xuli Pu, et al.Combustion synthesis and photoluminescence of SrAl 2 o 4 : Eu, Dy phosphor nanoparticles. Materials Letters, 58(2004): 352-356]