Pat.216169 Luminophore and a method for its preparation
Inventors: Eugeniusz Zych, Anna Dobrowolska
The invention solves the problem of still insufficient access to lighting and solar concentrators, which would be at the same time energy-saving, cheap in production, 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 the well-being and health), and also characterized by a high color rendering index.
APPLICATION
– lighting systems
– white LEDs
White 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 work of the Luminescent Materials Team has resulted in numerous patents and scientific publications covering research on modern phosphors.
An object of the invention is a phosphor (Ca3Y2Si6O18:Eu2+,Eu3+) that emits white light when stimulated in the near ultraviolet range. The white light can be generated by superposition of radiation of different energy ranges covering the visible light spectrum, that is, in the range 400- 700 nm. The luminophore emission consists of blue-green luminescence of Eu2+ ions and red luminescence of Eu3+ ions and covers almost the entire range of visible light 400-720 nm.
