Throughout this process, a different location is fashioned at the interface, called the depletion layer. A PN junction, when enclosed within a protective casing and has external prospects for electrical connections, kinds a PN junction diode. Mild-emitting diode (LED) is a extensively utilised standard supply of light-weight in electrical machines. https://www.uk-exhibitionstands.co.uk/product/large-exhibition-stands-design-3/