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![]() ![]() ![]() Questions or comments about this web site. Typically, up-conversion phosphors are illuminated with high intensity light sources suchĪs lasers in a controlled (subdued) lighting environment. Once your secret message has been written with this invisible ink pen, wait a few seconds to shine the light from the cap of the pen and reveal the secret of the secret message. By definition, up-conversion phosphors mustīe much less efficient than down-conversion phosphors. Is that up-conversion materials absorb two or more low energy photons and thenĮmit one high energy photon. AĬounter-intuitive anti-stokes process occurs where the material absorbs lowerĮnergy photons and emits higher energy photons as fluorescence. Up-Conversion is a very unusual phenomenon. Infrared has the lowest energy or longest wavelength. Within this spectrum, UVC has the highest energy or shortest Infrared - 700nm to 8000nm ( lowest energy level) Visible light - blue (400nm) to red (700nm) UVC - ultraviolet short wave - 250nm ( highest energy level) In the ultraviolet to infrared spectrum, energy levels go from Photon which has higher energy than an infrared photon. An ultraviolet light photon has higher energy than a visible light Might absorb ultraviolet light and emit visible light, or absorb visible andĮmit infrared, or absorb near infrared and emit far infrared.įluorescence almost always occurs as a shift down in photon energy levels or down-conversion. Typical fluorescent paints the glow in the human visible range).įluorescence can occur at any point of the electromagnetic spectrum.ĭifferent materials exhibit different fluorescent properties. Light) and the material remits some of the energy at a lower frequency (your Material is stimulated with energy (usually light) at one frequency (say a black Up / Down Conversion refers to the fluorescence shift up or down the ![]() Stimulated with infrared light, the powder will fluoresce in the visible IRUCG, IRUCR, IRUCB: Infrared to visible fluorescing powder.Stimulated with a blue or red light, the powder will fluoresce in the IRDC2: Visible to infrared fluorescing powder.Using a 630nm red filter, you can see the ink. Nearly invisible ink which will fluoresce in the infrared spectrum. IR Ink writing pen: Our IR ink writing pens writes in a.IR Up-Conversion: IR to Visible (anti-stokes IR Down-Conversion: Visible to IR, and IR to IR Please use the current site at We have two classes of IR invisible marking products: This is a historical page from the old website. ![]()
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