Abstract
Visible light communications (VLC) can utilize light-emitting diodes (LEDs) to provide illumination and a safe and low-cost broadcasting network simultaneously. In the past decade, there has been a growing interest in using organic LEDs (OLEDs) for soft lighting and display applications in public places. Organic electronics can be mechanically flexible, thus the potential of curved OLED panels/displays devices. This paper provides unique characteristics of a flexible OLED-based VLC link in a shopping mall. We show that, for curved OLED the radiation pattern displays a symmetry, which is wider than Lambertian. A number of scenarios of VLC system with flexible OLED are analyzed. Numerical models for the delay spread and optical path loss are derived, which followed a 2-term power series model for both empty and furnished rooms. We show that using a full-circular OLED for both empty and furnished rooms offers a uniform distribution of emitted power for the same transmission link spans. The link performance using full and half-circular OLED in an empty room shows that the average optical path losses are lower by 5 and 4 dB, compared with the furnished room.
Highlights
Visible light communications (VLC) provide illumination and wireless data transmission through the free space at the same time via intensity modulation of the light source [1,2]
We proposed a flexible organic-based LEDs (OLEDs) as the Tx in a VLC system to cover the shopping mall
We carried out the characterization of the OLED in terms of the spectrum profile and optical irradiation pattern as part of the simulation modeling of the light source
Summary
Visible light communications (VLC) provide illumination and wireless data transmission through the free space at the same time via intensity modulation of the light source [1,2]. In VLC, both the conventional silicon-based light-emitting diodes (LEDs) and organic-based LEDs (OLEDs), which are widely used as lamps and panels in homes, public places and offices, can be adopted [3,4]. With improved technologies and reduced fabrication and manufacturing costs, OLEDs offer an advantage over the conventional LEDs and other lighting technologies including self-emission, brighter with rich colors, biodegradable, wide beam angle, simple and flexible structure, with no need for backlighting and large active areas [6,7]. OLEDs have a low modulation bandwidth Bmod of hundreds of kHz compared with solid-state LEDs (a few MHz), which are due to the carrier lifetime and the parasitic resistor-capacitor (RC) effects [8]. An exciting feature of OLED panels is the potential of using flexible substrates to make lights that can be curved, rolled or folded
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