LED Street Lamp Historical Development
Time:2018-09-07 15:13:05As the world's most high-profile new generation of light source, led because of its high brightness, low calorie, short-lived, non-toxic, recyclable and other advantages, is known as the 21st century the most promising green lighting source.
Since 1962, the first red light semiconductor light-emitting Diode was born, people continue to develop a variety of orange, yellow, green and other monochrome led, and for a variety of signal indicators, logos, digital display, and gradually developed to small LED display. It uses the solid semiconductor chip as the luminescent material, when emits the excess energy, causes the photon emission, produces may use the semiconductor PN knot light source to produce the LED, was published in the early 1960s, 1964 Red Light-emitting Diode first developed successfully, the yellow led appears with it.
The world's first commercial light-emitting diode (LED) was made in 1965 with germanium material, its unit price of 45 U.S. dollars. Soon after, Monsanto and Hewlett-Packard Company launched the use of gaasp materials made of commercial led. This is much lower than the average 60~100w incandescent 151m. 1991 the industry adopted MOCVD epitaxial growth of four-element materials, the development of high-brightness light-emitting diodes; In 1994, the first Blue light-emitting diode was developed on Gan substrate; 1997 through the Blu-ray excitation fluorescent powder, make the first white light LED In 2001, ultraviolet light was used to excite phosphor to make white LED.
