Broadband Emission of Asymmetric Pyramids obtained by Laser Drilling and SAG for Application of Phosphor Free White LEDs

Recent years, white light emitting diodes (LEDs) have been one of the most promising light source in lots of applications, due to its excellent properties, such as high luminous efficacy, low power consumption, and environment-friendliness. However, the commercialized approach, which use blue or UV LEDs to excite some appropriate phosphors, has disadvantages in energy loss and low color rending index. In order to obtain high qulity phosphor free white LEDs, InGaN based micro- and nano-sized structures obtained by Selective Area Growth (SAG) method, is proposed. The quantum well (QWs) thickness and the Indium composition vary with position along the different facets of these structures, resulting in the emission of multiple wavelengths. Even though there is wavelength variation on the different…