The term optoelectronics is a specific discipline of electronics that focuses on light-emitting or light-detecting devices. Light-emitting devices use voltage and current to produce electromagnetic radiation (i.e., light). Such light-emitting devices are commonly used for purposes of illumination or as indicator lights. In contrast, light-detecting devices, such as phototransistors, are designed to convert received electromagnetic energy into electric current or voltage. Light-detecting devices can be used for light sensing and communication. Examples of these include darkness-activated switches and remote controls. In general terms, light-detecting devices work by using photons to liberate bound electrons within semiconductor materials. Photons are the fundamental units of electromagnetic radiation (EMR). Photons have a frequency of propagation, and we classify EMR based on this frequency—microwave EMR, infrared EMR, optical EMR, and so forth. The human eye is sensitive to optical EMR, which is further categorized into colors. Color is not an inherent property of photons; rather, photons have frequency, and human beings interpret these different frequencies as different colors. You can share your ideas & comments further at : editor.rjop@peerjournal.org optics@scholarlypub.com