Patent ID: 6905636

Claim:
A method for producing nano-scale europium activated yttrium gadolinium phosphor particles with fine granularity having an empirical formula of (Y 1-x-y-z Eu x Gd y M z )BO 3 , wherein: 0.01≦x≦0.1, 0≦y≦0.5, M=Ca, Sr, Ba or Mg, 0≦z≦0.1, the method adopting the technique which combines a sol-gel method with a microwave radiation method, in order to prevent rare earth metals ions from forming agglomerates and increase the concentration of uniformly dispersed rare earth metals ions on emitting centers, further decreasing the particle size to nano-scale and improving the product performances, comprising: (1) mixing a yttrium source, an europium source, a gadolinium source, a boron source and an M source to produce an aqueous solution according to an atom ratio of Y: Eu: Gd: M: B=(8-32): 1: (1-6): (0-2.4): (1-16); (2) putting the aqueous solution obtained in step (1) into a microwave synthesis system, and making the solution reacting under the condition of condensation cycling and stirring for 6-10 hours to produce a sol; (3) heating the sol obtained in step (2) to produce a gel; (4) drying the gel obtained in step (3); (5) calcining the dried gel obtained in step (4) at a temperature of 200-500° C. for 1-4 hours to remove the organic material therein, then baking at a temperature of 700-1000° C. for 4-8 hours to produce a semi-finished phosphor product; (6) washing the semi-finished phosphor product obtained in step (5) with water; and (7) collecting the product.