U.S. Patent 8,697,982 (April 15, 2014), "Light-Emitting Polymer," James W. Smith, and Bruce McKague (LEP America, Incorporated, Bloomfield Hills, Michigan, USA).
Light-emitting materials are used for self-illuminated signs and nuclear batteries. One example consists of polystyrene labeled with tritium that emits beta particles. The polymer is doped with a phosphor, emitting visible light when irradiated by the beta particles from the tritium. Instability because of phosphor diffusion is a problem for these systems.
Smith and McKague developed a stable radiation-emitting material based on a silicone with tritium and a wavelength-shifter side chain (phosphor) bonded to the silicone. The wavelength-shifter contains a cyclic, aromatic group emitting light in response to the tritium beta particles. The wave shifter content is 0.015 g per gram of silicone.
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|Title Annotation:||INDUSTRY PATENTS|
|Article Type:||Brief article|
|Date:||Jul 1, 2014|
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