Diode laser-excited phosphor-converted light sources: a review

Abstract

Solid-state lighting has been moving into new directions since its emergence in the 1990s. Light-emitting diodes (LEDs) and LED-based luminaires have seen impressive developments over time and now much research interest is being devoted to the development of a closely aligned lighting technology, based on using laser diodes. In many ways, this is similar to LED-based lighting, but in many ways it is also very different because of the peculiarities of semiconductor lasers and of laser-emitted light. This broad overview looks at recent and on-going developments in the field of diode laser-based lighting technologies. In doing this, it examines the role of laser diodes, phosphors, and system design in enabling the creation of illumination systems that are fit for various application requirements. Phosphors suitable for pumping with laser diodes have been given emphasis. Sufficient tutorial context is also provided so that readers can easily appreciate the import of various developments. Finally, the review also briefly looks at anticipated future developments in this field.