Exp.

%TTA:Tb:Dy:Eu

% SiO2

WTTA:Tb:Dy:Eu

[g]

WSiO2

[g]

Vol. of solution SiO2

[ml]

1

5

95

0.05

0.95

8.9039

2

10

90

0.1

0.90

8.4353

3

15

85

0.15

0.85

7.9667

4

20

80

0.20

0.80

7.4980

5

25

75

0.25

0.75

7.0294