LED development path

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    Electro-luminescence  in inorganic materials is the basis of LED luminescence. LED  luminescence was reported by Henry Round and Oleg Vladimirovich Losev in  1907 and 1927, respectively, by the current shining through the silicon  carbide (SiC) crystals. These results lead to further theoretical  studies of the semiconductor and p-n junction photovoltaic processes.

    In  the 1950s and 1960s, scientists began to study the electroluminescent  properties of Ge, Si and a series of III-V semiconductors such as InGaP  and GaAlAs. Richard Haynes and William Shockley demonstrated that  recombination of electrons and holes in a p-n junction leads to  luminescence. Subsequently, a series of semiconductors were studied,  culminating in the first red LED developed by Nick Holonyak in 1962.  Under his influence, George Craford invented orange  LED light in 1971,  and in 1972, he invented yellow and green LEDs, each consists of GaAsP..

    Strong  research has rapidly commercialized LEDs that emit light over a wide  range of wavelengths (from infrared to yellow), and Mainly used for  telephone or control panel lights. In fact, these LEDs are inefficient  and have limited current densities that make them very low-brightness  and not suitable for general lighting.

     

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