In recent years, the growing demand for faster data transmission has shifted researchers' attention from bandwidth-constrained radio technologies to optical wireless communication systems that provide "virtually" unlimited bandwidth by utilizing the ultraviolet to infrared region of the electromagnetic spectrum (>400 THz). In these systems, visible light communication (VLC) is attractive because of its potential to take advantage of light-emitting devices that are already widely used in commercial applications, from lighting systems to mobile phones and television displays.

The fastest VLC link reported to date consists of light emitting diodes (LED) and laser diodes (LD), which use inorganic semiconductors (usually gallium nitride) as the emitting medium and have high light output power and wide bandwidth. These features make inorganic LED and LD suitable for integration into dual-use lighting that can provide both white lighting and data transmission. However, the use of organic light-emitting diodes (OLeds) as an effective alternative has caused great concern for VLC. Interest in OLeds for communications is driven not only by their widespread use in display technology, but also by the same advantages of organic electronics' success. Importantly, organic semiconductors can be deposited over large areas cheaply by thermal evaporation or by spinning, scraping, inkjet, or spraying solutions. Lighting devices in OS(Organic Semiconductor) have already entered the market and are expected to be the next large-scale application of OS(Organic Semiconductor) after OLED displays.

Visible Light Communication (VLC) is a wireless technology that relies on light intensity modulation and could transform Internet of Things (IoT) connectivity. However, the low penetration depth of visible light in non-transparent media hinders VLC. One solution is to extend the operation to the "near (not) visible" near infrared (NIR, 700-1000 nm) region, extending the spectral range to the near infrared (NIR, 700-1000 nm) region not only to expand the bandwidth of the VLC link, but also to pave the way for its integration into many applications utilizing NIR radiation. Nir transmitters are used in several different areas, including safety, biodetection, and photodynamic/photothermal therapy, both of which benefit from the semi-transparency of biological tissue in this spectral window. In the case of wearable or implanted biosensors, NIR photons can be used to monitor human vital signs and communicate wirelessly with other devices.

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