Development of Nanoceramics by Uniform Distribution of Phosphor in Broken Glass Materials Through Recycling Routes for WLED applications

The process of transmuting waste materials in to the useful products is possible through recycling process. Therefore, this research work has been planned to achieve high efficiency White Light Emitting Diodes (WLED’S) using... [ view full abstract ]

The process of transmuting waste materials in to the useful products is possible through recycling process. Therefore, this research work has been planned to achieve high efficiency White Light Emitting Diodes (WLED’S) using the broken glass materials. The demand for the high efficiency LED’s is increasing due to current scenario of energy crisis across the globe. The earlier LED’s had limited performance and less life span. These limitations can be overcome by fabricating the luminescent based nanophosphor materials in high range temperature. In recent times, innovation in advance research focused on phosphor in glass (PIG) materials. This can be achieved by dispersing phosphor in 10-30% glass matrix. However, it is quite expensive to fabricate. Considering all these peculiarities, the objective of the work is to achieve high efficiency, low cost, long life span LED’s to meet and the energy demands. A novel nanoceramic material, by the combination of nanophosphor in broken glass (PIBG) material has been developed. The nanophosphor materials has been synthesized by Dy3+ doped with Strontium Aluminium Oxide (SrAl2O4) through solid state reaction which is fabricated at 1350°C. The average crystal size of pure nanoparticles are found to be 35nm which is characterized by X-Ray Diffraction technique. By dispersing the certain amount of phosphor in broken glass materials, the average crystal size of the PIBG materials was found to be 13, 14, and 45 nm. The SEM & HRTEM reveals that, the surface morphologies of the pure nanoparticles are spherical in shape. The PIBG materials was found to have uniform distribution of particles at 2:9 ratio. The results of HRTEM studies reveals the particle size of Dy3+:SrAl2O4 nano particles of 27-42 nm which corroborates approximately to the average crystal size calculated from XRD. Besides, our approach had achieved the remarkably transparent optical properties at 2:9 ratio from the data obtained from luminescence spectra. The CIE co-ordinates acclaimed that the broken glass matrix with combination of Dy3+:SrAl2O4 nanoparticles is suitable for white emission.