Method for eradicating pathogens
A glass has a transmittance at a wavelength of 220 nm of at least 30% and a transmittance at a wavelength of 200 nm of less than 4.0%, the glass having a total platinum content of less than 3.5 ppm. A device and a sterilizer include a light source configured to output ultraviolet light and a lamp cover covering the light source and including the glass.
1 . A glass having a transmittance at a wavelength of 220 nm of at least 30% and a transmittance at a wavelength of 200 nm of less than 4.0%, the glass having a total platinum content of less than 3.5 ppm, wherein the glass comprises the following components in the indicated amounts (in mol %):
Component
Content [mol %]
SiO 2
70 to 80
Al 2 O 3
0.5 to 4.5
B 2 O 3
1.5 to 2.0
Li 2 O
0 to 2
Na 2 O
4 to 10
K 2 O
4 to 8
CaO
0 to 1
SrO
0 to 0.5
BaO
1.5 to 4
F −
0 to 2.
2 . The glass of claim 1 , wherein the glass has a transmittance of at least 75% at wavelengths of at least one of 260 nm, 280 nm or 310 nm.
3 . The glass of claim 1 , wherein the glass has a transmittance of at least 40% at a wavelength of 220 nm.
4 . The glass of claim 1 , wherein the glass comprises a total content of Fe 2 O 3 from 0.5 ppm to 10 ppm.
5 . The glass of claim 4 , wherein the glass has a content of Fe 2 O 3 from 1 ppm to 10 ppm, a content of TiO 2 from 2 ppm to 30 ppm, and the transmittance at a wavelength of 200 nm is less than 3%.
6 . The glass of claim 1 , wherein the glass has a total platinum content below 1.0 ppm.
7 . The glass of claim 1 , wherein the glass has a wave front deviation (peak to valley) of less than =0.1 mm.
8 . The glass of claim 1 , wherein the glass has a refractive index n d of from 1.450 to 1.580.
9 . The glass of claim 1 , wherein the glass comprises the following components in the indicated amounts (in mol %):
Component
Content [mol %]
SiO 2
70 to 80
Al 2 O 3
0.5 to 4.5
Na 2 O
4 to 10
K 2 O
4 to 8
MgO
0 to 10
B 2 O 3
1.5 to 2.0
Li 2 O
0 to 2
ZnO
0 to 5
CaO
0 to 1
BaO
1.5 to 4
ZrO 2
0 to 5
SnO 2
0 to 3
SrO
0 to 4
F −
1 to 2
Cl −
0 to 1.
10 . The glass of claim 1 , wherein the glass is thermally toughened or chemically toughened.
11 . The glass of claim 10 , wherein the glass has a compressive stress on at least one surface of at least 50 MPa.
12 . A device, comprising:
a light source configured to output ultraviolet (UV) light; and
a lamp cover covering the light source, the lamp cover comprising a glass having a transmittance at a wavelength of 220 nm of at least 30% and a transmittance at a wavelength of 200 nm of less than 4.0%, the glass having a total platinum content of less than 3.5 ppm, wherein the glass comprises the following components in the indicated amounts (in mol %):
Component
Content [mol %]
SiO 2
70 to 80
Al 2 O 3
0.5 to 4.5
B 2 O 3
1.5 to 2.0
Li 2 O
0 to 2
Na 2 O
4 to 10
K 2 O
4 to 8
CaO
0 to 1
SrO
0 to 0.5
BaO
1.5 to 4
F −
0 to 2.
13 . The device of claim 12 , wherein the glass has a transmittance of at least 75% at wavelengths of at least one of 260 nm, 280 nm or 310 nm.
14 . The device of claim 12 , wherein the glass has a transmittance of at least 40% at a wavelength of 220 nm.
15 . The device of claim 12 , wherein the glass comprises a total content of Fe 2 O 3 from 0.5 ppm to 10 ppm.
16 . The device of claim 15 , wherein the glass has a content of Fe 2 O 3 from 1 ppm to 10 ppm, a content of TiO 2 from 2 ppm to 30 ppm, and the transmittance at a wavelength of 200 nm is less than 3%.
17 . The device of claim 12 , wherein the glass has a total platinum content below 1.0 ppm.
18 . The device of claim 12 , wherein the glass has a wave front deviation (peak to valley) of less than +0.1 mm.
19 . The device of claim 12 , wherein the glass has a refractive index n d of from 1.450 to 1.580.
20 . The device of claim 12 , wherein the glass comprises the following components in the indicated amounts (in mol %):
Component
Content [mol %]
SiO 2
70 to 80
Al 2 O 3
0.5 to 4.5
Na 2 O
4 to 10
K 2 O
4 to 8
MgO
0 to 10
B 2 O 3
1.5 to 2.0
Li 2 O
0 to 2
ZnO
0 to 5
CaO
0 to 1
BaO
1.5 to 4
ZrO 2
0 to 5
SnO 2
0 to 3
SrO
0 to 4
F −
1 to 2
Cl −
0 to 1.
21 . A sterilizer, comprising:
a light source configured to output ultraviolet (UV) light at a wavelength of 222 nm; and
a lamp cover covering the light source, the lamp cover comprising a glass having a transmittance at a wavelength of 220 nm of at least 30% and a transmittance at a wavelength of 200 nm of less than 4.0%, the glass having a total platinum content of less than 3.5 ppm, wherein the glass comprises the following components in the indicated amounts (in mol %):
Component
Content [mol %]
SiO 2
70 to 80
Al 2 O 3
0.5 to 4.5
B 2 O 3
1.5 to 2.0
Li 2 O
0 to 2
Na 2 O
4 to 10
K 2 O
4 to 8
CaO
0 to 1
SrO
0 to 0.5
BaO
1.5 to 4
F −
0 to 2.
22 . The sterilizer of claim 21 , wherein the UV light output by the light source is effective to eradicate pathogens after passing through the lamp cover.