Modeling of photoluminescence in laser-based lighting systems
2017
The development of laser-based lighting systems has been the latest step towards a revolution in illumination technology
brought about by solid-state lighting. Laser-activated remote phosphor systems produce white light sources with
significantly higher luminance than LEDs. The weak point of such systems is often considered to be the conversion
element. The high-intensity exciting laser beam in combination with the limited thermal conductivity of ceramic
phosphor materials leads to thermal quenching, the phenomenon in which the emission efficiency decreases as
temperature rises. For this reason, the aim of the presented study is the modeling of remote phosphor systems in order to
investigate their thermal limitations and to calculate the parameters for optimizing the efficiency of such systems. The
common approach to simulate remote phosphor systems utilizes a combination of different tools such as ray tracing
algorithms and wave optics tools for describing the incident and converted light, whereas the modeling of the conversion
process itself, i.e. photoluminescence, in most cases is circumvented by using the absorption and emission spectra of the
phosphor material. In this study, we describe the processes involved in luminescence quantum-mechanically using the
single-configurational-coordinate diagram as well as the Franck-Condon principle and propose a simulation model that
incorporates the temperature dependence of these processes. Following an increasing awareness of climate change and
environmental issues, the development of ecologically friendly lighting systems featuring low power consumption and
high luminous efficiency is imperative more than ever. The better understanding of laser-based lighting systems is an
important step towards that aim as they may improve on LEDs in the near future.
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