| 摘要 |
The red light emitting fluorescent material of Y2O2S:Eu is mfd. by (a) mixing 100 wt. pts. of yttrium oxide (Y2O3) with 4.0-4.8 wt. pts. of europium oxide (Eu2O3), 30-60 wt. pts. of sodium carbonate (Na2CO3), 50-70 wt. pts. of sulphur (S) and 10-30 wt. pts. of potassium hydrogen phosphate (K2HPO4), (b) firing the mixt. at 1100-1200 deg.C for 1-4 hr, (c) mixing 100 wt. pts. of Y2O2S:Eu with 3-5 wt. pts. of Eu2O3, 20-40 wt. pts. of Na2CO3, 30-50 wt. pts. of S, 10-30 wt. pts. of K2HPO4 and 20-50 ppm terbium (Tb) , and (d) firing the mixt. at 1300-1500 deg.C for 1-4 hr. The fluorescent material has a high luminance.
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