Conversionless efficient and broadband laser light diffusers for high brightness illumination applications

Fabian Schütt (), Maximilian Zapf, Stefano Signetti, Julian Strobel, Helge Krüger, Robert Röder, Jürgen Carstensen, Niklas Wolff, Janik Marx, Tian Carey, Marleen Schweichel, Maik-Ivo Terasa, Leonard Siebert, Hyo-Ki Hong, Sören Kaps, Bodo Fiedler, Yogendra Kumar Mishra, Zonghoon Lee, Nicola M. Pugno, Lorenz Kienle, Andrea C. Ferrari, Felice Torrisi, Carsten Ronning and Rainer Adelung ()
Additional contact information
Fabian Schütt: Kiel University
Maximilian Zapf: Friedrich-Schiller-University Jena
Stefano Signetti: University of Trento
Julian Strobel: Kiel University
Helge Krüger: Kiel University
Robert Röder: Friedrich-Schiller-University Jena
Jürgen Carstensen: Kiel University
Niklas Wolff: Kiel University
Janik Marx: Hamburg University of Technology
Tian Carey: University of Cambridge
Marleen Schweichel: Kiel University
Maik-Ivo Terasa: Kiel University
Leonard Siebert: Kiel University
Hyo-Ki Hong: Ulsan National Institute of Science and Technology (UNIST)
Sören Kaps: Kiel University
Bodo Fiedler: Hamburg University of Technology
Yogendra Kumar Mishra: University of Southern Denmark
Zonghoon Lee: Ulsan National Institute of Science and Technology (UNIST)
Nicola M. Pugno: University of Trento
Lorenz Kienle: Kiel University
Andrea C. Ferrari: University of Cambridge
Felice Torrisi: University of Cambridge
Carsten Ronning: Friedrich-Schiller-University Jena
Rainer Adelung: Kiel University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Laser diodes are efficient light sources. However, state-of-the-art laser diode-based lighting systems rely on light-converting inorganic phosphor materials, which strongly limit the efficiency and lifetime, as well as achievable light output due to energy losses, saturation, thermal degradation, and low irradiance levels. Here, we demonstrate a macroscopically expanded, three-dimensional diffuser composed of interconnected hollow hexagonal boron nitride microtubes with nanoscopic wall-thickness, acting as an artificial solid fog, capable of withstanding ~10 times the irradiance level of remote phosphors. In contrast to phosphors, no light conversion is required as the diffuser relies solely on strong broadband (full visible range) lossless multiple light scattering events, enabled by a highly porous (>99.99%) non-absorbing nanoarchitecture, resulting in efficiencies of ~98%. This can unleash the potential of lasers for high-brightness lighting applications, such as automotive headlights, projection technology or lighting for large spaces.

Date: 2020
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DOI: 10.1038/s41467-020-14875-z

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