Using Scattering Particles for Packaging Efficiency Enhancement in Pc-Wleds

To extend our study on the optical properties of the high power LEDs, we would like to explore with the combined effects of the LED packaging with the scattering particles. It will also establish one practical optical model for simulation in order to simplify the procedure for solving problems of the applications. In this work, the enhancement by the scattering particles will be quantitatively modeled, and the optimal combination of the wavelength-conversion elements and the scattering particles will be found to have highest performance. Actually, the wavelength-conversion elements are not just only the conventional phosphors, but also including the new quantum-dots, and even for the micro-LEDs. For the development of the solid-state lighting technology, the scattering particles are important but seldom considered yet. Conventionally, the application of the phosphors is unavoidable to some certain energy loss. With the aid of the scattering particles, the chance of the interaction between the LED excitation lights and the wavelength-conversion elements will be highly improved, and the energy loss is thus reduced. Moreover, the application of the scattering particles will also bring to higher spatial uniformity of the white light quality. We hope to exploit the properties of the scatting particles in the LED packaging in depth, and provide with one practical optical model for simulation.