A Study of Solid-State Lighting for Rare Earth Ions Experiments | Original Article

ABSTRACT:

The aim of this study is to the best of one’s knowledge, this is the first time that blue light emitting flexible AC powder electroluminescence (ACPEL) devices have been fabricated with undoped and Europium incorporated ZnGa2O4 as well as undoped CaWO4 phosphors and their characteristics were tested. The materials that are directly or indirectly used to advance the existing technology or to develop new technologies are technologically important. It can be achieved by improving performance, improving activity or changing the overall performance of the device in terms of accuracy, cost, handling and safety etc. In the last few years a major progress in the phosphorus sector has been explored through the introduction in different host matrices of phosphorus for solid state lighting applications of transitional metal ions and trivalent rare earth ions (lanthanides), the use of luminescent centers (dopants). Usually, most phosphors consist of a host material that is composed of a family of sulphides, phosphates, aluminats, oxides, molybdates, tungsten sulphides, silicates etc (transition metal ions and lanthanides). The host grating is usually a wide-band semi-conductor or insulator and it is suitable for accommodating doping ions. The host compound also controls little of the luminescent phosphorus' physical and chemical behavior, such as emission intensity and life-long properties. In most cases, the concentration levels of dopant ions or activator ions range from a few ppm to 1 to 5 ppm in host trees. Soft -chemical pathways are a technique for low-temperature synthesis which permits better reaction compositional homogeneity. However, it is important to ensure that certain compounds such as transitional metals and rare earth based oxides have their synthesis, chemical and thermal stability. In order to obtain these technologically significant materials, a careful choice of preparation techniques and the fine tuning of process parameters are necessary.