Toshiba Corporation has unveiled a new photoluminescence technology, a novel phosphor that delivers excellent solubility in polymers or organic solvents, where it is transparent and colorless under visible light, and that emits persistent red-light emissions under UV light, with excellent color purity and six times the luminescence of current phosphors. These characteristics open up many potential applications, including LED lighting, displays, deep UV sensing, security printing, and pesticide residue testing.
However, in the field of mini- and micro-LED lighting and displays, where the chips used are very small, the inorganic phosphors typically used have a limited color reproduction capability and luminescence intensity. Current phosphors are also insoluble and exist as fine particles. Toshiba’s new phosphor overcomes these problems.
The new phosphor’s chemistry is based on novel lanthanide luminescent complexes. This created a new structure that is highly soluble, with excellent transparency, and that successfully increases luminescence intensity to achieve high color purity and durable emission. The molecular design method also has the potential to create phosphors that emit different colored light when applied to different luminescent complexes. The new phosphor has an excitation spectrum that’s deep ultraviolet (222 nm) to purple (405 nm). Its emission spectrum is 613 nm (red).
Toshiba will soon begin to provide samples of the phosphor and fluorescent films and explore partnerships for applications in areas, including lighting, display, printing and chemical industries. The company aims to start mass production in 2025.
More information is available here.
Images: Toshiba
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