Manufacturing method of strontium aluminate phosphor by the sol-gel method

摘要

PURPOSE: Provided is a process for producing a strontium aluminate phosphor by using sol-gel method capable of producing a phosphor which is excellent in luminance and long persistence and can be calcined at relatively low temperature. CONSTITUTION: The process comprises the steps of (i) mixing 200-220 mol of distilled water(H2O) and 4-5 mol of isopropanol(iso-C3H7OH) and 0.1-0.3 mol of HCl which is catalyst, into 1 mol of Al(O-nC3H7)3 and stirring the mixture until pH of the mixture is not changed at about 80 deg.C; (ii) sequentially adding 55-65 mol of distilled water, and 0.02-0.03 mol of Eu(NO3)3.6H2O and Dy(NO3)3.6H2O respectively, and 0.1-0.3 mol of HNO3(which is catalyst) into 0.95 mol of Sr(NO3)2 and stirring the mixture until pH of the mixture is not changed; (iii) mixing solutions formed in the steps (i) and (ii) and stirring the mixture until pH of the mixture is not changed, so as to obtain a sol, and drying the sol at 100 deg.C for 48 hours and pulverizing the dried sol; (iv) calcining the pulverized powder in atmosphere of 1200 deg.C or more for 4 hours and re-pulverizing the powder; and (v) heat-treating the repulverized powder under reducing atmosphere of mixed gas of nitrogen and hydrogen in 9:1 at 1300 deg.C for 3 hours.