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4 March 2019 Luminescent materials for high-power-density light sources (Conference Presentation)
Andries Meijerink
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Proceedings Volume 10940, Light-Emitting Devices, Materials, and Applications; 1094014 (2019) https://doi.org/10.1117/12.2511975
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
There is an increasing need for high power density light sources, e.g. for the next generation of car headlights, diode laser pumped white light sources and projection devices. However, saturation and droop at high excitation densities limit the light output in high power devices. Excited state absorption and long excited state lifetimes play a role, but the relation between light output and excitation power is a poorly understood and is complex interplay of quenching processes including reabsorption and (transient) color center formation. The development of superior materials is crucial and relies on a better understanding of droop processes and the relation with the nature and processing condition of light conversion materials. In this presentation a basic (and hopefully insightful) overview of known luminescence quenching processes will be followed by a discussion on how we can increase our understanding of luminescence quenching with a focus on high power applications. A variety of quenching mechanisms will be evaluated and illustrated for known and new luminescent materials. New experimental and theoretical capabilities will be discussed that may help to acquire new insights in what limits the light output in current and future light sources.
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Andries Meijerink "Luminescent materials for high-power-density light sources (Conference Presentation)", Proc. SPIE 10940, Light-Emitting Devices, Materials, and Applications, 1094014 (4 March 2019); https://doi.org/10.1117/12.2511975
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KEYWORDS
Light sources
Quenching (fluorescence)
Luminescence
Absorption
Color centers
Headlamps
High power lasers
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