Optical Filters and Specialty Glasses
Phosphorescent Glass G2000/ R2000

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.

- 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)

  • Emission Spectrum

  • Transmission Spectrum

R2000 (Red Phosphorescent Glass)

  • Emission Spectrum

  • 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.