▎ 摘　　要

NOVELTY - The transmitter (13) comprises six graphene-based light emitting devices (LED1-LED8) that are made of different peak transmission wavelengths from each other. The respective gate voltage tuner (VG) is associated with one of the graphene-based light emitting devices that are operated to tune the peak transmission wavelength of the respective graphene-based light emitting device. A modulator is operated to switch selected ones of the graphene-based light emitting devices on and off to encode information using color shift keying. A phototransistor is comprised of a pair of stacked graphene monolayers. USE - Visible light communication transmitter of visible light communication system (claimed) for color shift keying. ADVANTAGE - The optimization of the symbol error rate and signal-to-noise ratio by tuning the peak transmission wavelengths is ensured. The power efficiency in both transmission and reception are improved and the number of symbols is increased. The symbol error rate is reduced and the signal-to-noise ratio is improved. The better and more efficient detection of the visible light output by the graphene-based light emitting devices is achieved. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a visible light communication receiver; (2) a visible light communication system; (3) the method for performing visible light communication; and (4) the method for performing color shift keying. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an elements of visible light communication system for color shift keying. Visible light communication system (2) Visible light communication transmitter (13) Visible light communication receiver (14) Graphene-based light emitting device (LED1-LED8) Gate voltage tuner (VG)