Optical Filters and Specialty Glasses
Phosphorescent Glass
G2000/ R2000
- SUMITA’s long-lasting phosphorescent glass stores light energy and continue to light in darkness
- Emit light for long hours
- New phosphorescent material Terbium (a rare earth metallic element) is used
- Store light energy in a transparent glass
- Available in green (G2000) and red (R2000) emissions
Mechanism of Phosphorescent Glass
It is assumed that inside phosphorescent glass, light energy moves and the glass stores electrons temporarily from the ground state to the upper tank called trap, then discharge the electrons gradually while emitting light for long hours.
Necessary Light for Storing Light
- Sunlight
- Fluorescent light (general lighting, black light, germicidal lamp)
- Light source that contains ultraviolet (UV) rays
Please be sure to irradiate more than a few minutes.
- Note:
- - Higher temperature of phosphorescent glass makes an emission amount lower and the time for emission shorter.
- - When lights are stored, the phosphorescent glass becomes yellowish. Also, it gets lighter in color as it emits light.
G2000 (Green Phosphorescent Glass)
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Emission Spectrum
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Transmission Spectrum
R2000 (Red Phosphorescent Glass)
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Emission Spectrum
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Transmission Spectrum
Temporal Change in Emission Intensity
| G2000 | R2000 | |
|---|---|---|
| Peak emission wavelength (nm) | 542 | 645 |
| Refractive index (nd) | 1.680 | 1.692 |
| Transformation point Tg (℃) | 593 | 551 |
| Yielding point At (℃) | 650 | 597 |
| Thermal expansion (α x 10-7) | 85 | 68 |
| Specific gravity S.g | 4.05 | 4.10 |
Note: Data is obtained from sample products. Hereafter, it is subject to change without notice in advance.
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