- 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
- 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.
- - 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)
R2000 (Red Phosphorescent Glass)
Temporal Change in Emission Intensity
|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.