Monolithic semiconductor lasers capable of emitting over the full visible-colour spectrum have a wide range of important applications, such as solid-state lighting, full-colour displays, visible colour communications and multi-colour fluorescence sensing. The ultimate form of such a light source would be a monolithic white laser. However, realizing such a device has been challenging because of intrinsic difficulties in achieving epitaxial growth of the mismatched materials required for different colour emission. Here, we demonstrate a monolithic multi-segment semiconductor nanosheet based on a quaternary alloy of ZnCdSSe that simultaneously lases in the red, green and blue. This is made possible by a novel nanomaterial growth strategy that enables separate control of the composition, morphology and therefore bandgaps of the segments. Our nanolaser can be dynamically tuned to emit over the full visible-colour range, covering 70% more perceptible colours than the most commonly used illuminants.
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The authors thank the Army Research Office for their initial support on nanowire research (award no. W911NF-08-1-0471, under M. Gerhold) that eventually led to this work. The authors acknowledge the use of facilities within the LeRoy Eyring Center for Solid State Science at Arizona State University, especially D. Wright and A.J. Mardinly for their assistance with the CVD set-up and high-resolution TEM, respectively. F.F. thanks the China Scholar Council for a scholarship, and S.T. thanks the Republic of Turkey's Ministry of National Education for financial support through its fellowship.
The authors declare no competing financial interests.
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Fan, F., Turkdogan, S., Liu, Z. et al. A monolithic white laser. Nature Nanotech 10, 796–803 (2015). https://doi.org/10.1038/nnano.2015.149
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