Solid-State Lighting

Research Challenge 1: Nanowires This Research Challenge explores the synthesis and properties of GaN/InGaN nanowires as a materials architecture for visible light-emission. If nanowire devices could span the entire visible spectrum, the RYG-gap  would be overcome. In addition, such full-spectrum emission would enable chromaticity-tunable light, which could also impact so-called smart (or higher functionality) lighting, [...]

Research Challenge 3: Competing Radiative and Non-Radiative Processes Conduction and valence band profile of an InGaN MQW LED active region including GaN barrier modification due to polarization fields and Si doping. Dominant emission is from the rightmost (p-side) QW. This Research Challenge aims to develop a microscopic understanding of the competing physical processes that determine [...]

 Research Challenge 2: Quantum Dots and Phosphors Phosphor in powder form. (KLuTa2O7: Eu3+) This Research Challenge is aimed at studying materials architectures suitable for wavelength down-conversion in solid-state lighting. Particular materials we have focused on in this Research Challenge are Eu3+-doped phosphors and II-VI quantum dots (QDs). Among the principal criteria for such wavelength down-conversion [...]

Introduction The vision of the Solid-State Lighting Science Energy Frontier Research Center (SSLS EFRC) is to help build the scientific foundation to produce the most light for the least energy throughout the world, through ultra-efficient solid-state lighting. Although solid-state lighting is still young, specific materials architectures – exploiting certain light-emission phenomena – have already been [...]

Solid-State Lighting Technology Challenges To illustrate why commercial SSL lamps are only at 20% efficiency today, the Figure shows the anatomy of a common state-of-the-art commercial white solid-state lamp, along with the spectral power density of its emission. The lamp consists of a blue LED, 1-square-mm in size, driven with 0.7A of current, and coated [...]