Analogue says it has used “a proprietary high-quality photo-luminescent plastic” for the limited edition Pocket, adding that the special plastic material can charge using direct sunlight and incandescent bulbs. The company says how many hours of light exposure you need for a full charge, but promises that the surface can emit a starry green light for hours at a stretch.
Glow-in-the-dark materials are not exactly a new science. Technically known as photoluminescent materials, these products contain inorganic phosphors in the form of phosphorescent powders. When they are exposed to light in a certain wavelength range, such as ultraviolet, these phosphor particles get energized.
The energy is stored in the form of photons, the smallest packet of light. When the light source is removed aka when it gets dark, these phosphor particles release the energy in the form of visible light. In the Analogue Pocket’s case, you see a green aura emanating from the surface of its limited edition glow-in-the-dark device.
Zinc Sulfide and Strontium Aluminate are two of the most commonly used phosphor compounds, but the latter is more popular these days because it offers stronger light persistence. Usually, it is molded with plastic to make hard materials like the chassis of the Analogue Pocket, but when mixed with other chemicals, you also get products like glowing wristbands, glow sticks for exploration, and even clothing items.
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