Nitrides Seminar - Clayton Cozzan, Graduate Student Researcher

5/8/2018 12PM ESB 1001

Solid-state lighting (SSL) utilizes a semiconductor-based emitter instead of plasma or a filament and is more energy efficient than traditional sources. SSL is being widely adopted thanks to improvements in color quality and luminaire design, which has reduced pollution and is predicted to save nearly $630 billion in avoided energy costs by 2035. In SSL, the semiconductor-based emitter can be a light emitting diode (LED) or a laser diode (LD) coupled with phosphor materials. LED and LD emitters produce light of a single color, and that color is subsequently absorbed and converted by phosphors to create white light. Phosphor converted LEDs have been widely adopted and operate best in the low to mid power regime. Using LDs as the emitting source shows promise for high power white lighting, offering improvements over LED-based lighting including energy savings, more light output for a given chip area, smaller devices, and new capabilities such as visible light communication and optical fiber lighting. The thermal and optical demands of the phosphor converting element change dramatically for LD lighting, and new routes toward processing and engineering phosphors capable of withstanding high light flux need to be discovered and improved.

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