Pat.220185 Luminophore and a method for its preparation
Inventors: Jerzy Sokolnicki, Eugeniusz Zych
The invention solves the problem of still insufficient access to lighting and solar concentrators, which would be at the same time energy-saving, cheap to manufacture, environmentally friendly (not containing environmentally harmful substances during disposal), have a positive impact on users (through the emission spectrum close to the spectrum of natural sunlight, which optimally affects well-being and health), and also characterized by a high color rendering index.
APPLICATION
– lighting systems,
– light emitting diodes (LEDs),
– white light emitting diodes (WLED)
White and red light phosphor
LED lamps shining continuously for 100 000 hours, glowing paint on pedestrian crossings or bicycle paths, glowing road signs – these are the light sources available today with the help of phosphors. Phosphors are chemical compounds which emit light upon proper stimulation. In the Luminescent Materials Team at the Faculty of Chemistry, led by Professor Eugeniusz Zych, these compounds have been studied and improved for years. The result of these developments are modern luminophores, which are used, among other things, in LED lamps and are characterised by a wide range of light emissions. The use of luminophores is an energy-efficient, economical and environmentally friendly solution. Lamps using luminophores are also user-friendly, providing the full spectrum of sunlight, which significantly reduces eyestrain and ill-health. LED lamps are considered to be the lighting materials of the future, replacing tungsten and energy-saving incandescent and fluorescent lamps. This is due to the fact that they are much more energy efficient, do not contain toxic mercury and have a longer lifetime.
The object of the invention is a phosphor consist of matrix in the form of yttrium silicate with calcium or pod, (Ca,Sr)2Y8(SiO4)6O2, and a dopant in the form of Ce3+ and Mn2+ ions emitting red or white light when stimulated in the UV region. The use of the phosphor in white diodes is that the phosphor stimulated with light from the UV region emits white light in the form of a broad band in the spectral range 350 – 650 nm.
