Development of New Highly Effective Phosphor/Luminescence Materials for ‎New Generation Emission Display Devices and White LEDs

A volume of word production of luminescence steadily increases. The industries of advanced countries (China, Japan, South Korea, Netherland, Germany, USA) put out more than 3000-ton different type luminescence materials of total cost about 1 milliard. Owing to their use in fluorescent lamps, photovoltaic cell, white light emission and many display applications, high luminous efficiency, plant growth, medical diagnosis, photovoltaic performance, optical thermometers, energy saving, environment friendliness, bio images, and luminescent materials influence our everyday lives. Research today focuses on improving already very mature as well as developing fresh materials required by a multitude of new applications. Phosphors converted semiconductor based white LED is a new lime lighting. The product of white LED has been widely used in in general lighting, but the high value added products for white LED are top lighting and display backlight with wide colour gamut. The red phosphors presently used in white LED are mainly activated with ions with broad band emission, which cannot meet the requirements. The aim of the project is to develop several high colour rending new phosphors being applicable to excited by strong near UV or violet emitting LED chip, which are activated with Eu3+, Sm3+ ions in borate hosts and enhanced the emission by bridge chain energy transfer, Ce3+-Dy3+or Tb3+-Eu3+ or Tm3+-Dy3+-Eu3+ or Sm3+, where Ce3+ or Tm3+ is sensitizer with adjustable excitation band Tb3+ or Dy3+ ions are media for energy transfer. To overcome the complexity problem of the research objects, combinatorial method is used to prepare phosphor material with high throughput and synchrotron radiation is employed to analyse the phase purity. The strategic research contents are to adjust the excitation and emission spectra of materials, the structure of material and the change of energy levels, to explore the mechanism of energy transfer and its influence factors, and to improve the emission efficiency and the thermal quenching resistance property of the phosphor material by co-doping with additional non emitting rare earth ions and energy transfer. Furthermore, we will fabricate LED devices with as prepared phosphors and chips, and study their properties. The present research project has many important values in the fields of chemistry and physic of rare earths, inorganic solid state chemistry, and solid state luminescence, photovoltaic cell to enhance the efficiency cell, which will lay a good foundation for acquiring the research finding with independent intellectual properties.