Abstract
This paper reports the utilization of colloidal semiconductor quantum dots as color converters for Gb/s visible light communications. We briefly review the design and properties of colloidal quantum dots and discuss them in the context of fast color conversion of InGaN light sources, in particular in view of the effects of self-absorption. This is followed by a description of a CQD/polymer composite format of color converters. We show samples of such color-converting composite emitting at green, yellow/orange and red wavelengths, and combine these with a blue-emitting microsize LED to form hybrid sources for wireless visible light communication links. In this way data rates up to 1 Gb/s over distances of a few tens of centimeters have been demonstrated. Finally, we broaden the discussion by considering the possibility for wavelength division multiplexing as well as the use of alternative colloidal semiconductor nanocrystals.
Highlights
C OLLOIDAL semiconductor quantum dots (CQDs) are efficient light-emitting nanoparticles that have been the focus of intense research and development over the last two decades [1], both in academia and in industry
Thanks to their solution processability, high photoluminescence quantum yield (PLQY), broad absorption and narrow emission linewidths, CQDs are an attractive alternative to the rare-earth phosphors that are found in standard commercial white light-emitting diode (LED)
We demonstrate a free-space visible light communications (VLC) link using a μLED hybridized with the CQD/PMMA color converters (Fig. 1(a)) as the optical source
Summary
C OLLOIDAL semiconductor quantum dots (CQDs) are efficient light-emitting nanoparticles that have been the focus of intense research and development over the last two decades [1], both in academia and in industry. VLC, and by extension LiFi [19], is a generation communication technology seen as essential to help cope with the ever-increasing demand on wireless data communications [19]–[21] It capitalizes on the rapid development of efficient blue InGaN-based LEDs and lasers, mainly driven by the needs of the solid-state lighting industry [20]. The narrow emission linewidth of CQDs that was mentioned above as a parameter for superior color purity and light quality, is attractive for wavelength division multiplexing, whereby data is sent in parallel using different colours The latter is desirable for waveguidebased VLC, as is for example used in-vehicle communication systems.
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