Compound semiconductors Compound semiconductors Blue lasers have applications in many areas, from opto-electronic data storage at high-density, to medical applications. Until the mid 1990s blue lasers were large and expensive gas laser instruments which rely on population inversion in rare gas mixtures and need high currents and strong cooling. In the mid 1990's Shuji Nakamura at Nichia Chemical Industries in Anan (Tokushima-ken, Japan) in a series of inventions developed commercially viable blue and violet semiconductor lasers based on gallium nitride compound sectors, using quantum wells or quantum dots spontaneously formed via self-assembly. This invention enables the development of small, convenient and low priced blue, violet and UV lasers, which have not been available before, opening applications such as high-density DVD data storage Blu-ray disc. ...more on Wikipedia about "Blue laser"
Gallium arsenide ( ) is a chemical compound composed of gallium and arsenic. It is an important semiconductor, and is used to make devices such as microwave frequency integrated circuits (ie, MMICs), infrared light-emitting diodes and laser diodes. ...more on Wikipedia about "Gallium arsenide"
Gallium nitride ( ) is a semiconductor material with wide (3.4 eV) band gap, used in optoelectronic, high-power and high-frequency devices. It is a binary group III/ group V direct bandgap semiconductor. Its sensitivity to ionizing radiation is low (like other group III nitrides), making it a suitable material for solar cell arrays for satellites. ...more on Wikipedia about "Gallium nitride"
Indium arsenide, InAs, or indium monoarsenide, is a semiconductor material, a semiconductor composed of indium and arsenic. It has the appearance of grey cubic crystals with melting point 942 °C. ...more on Wikipedia about "Indium arsenide"
The first Polish blue laser ( third in the world ) was constructed at Unipress by a 30-man team headed by Prof. Sylwester Porowski, on December 12 2001, The Polish scientists obtained crystals of gallium nitride under very high pressure using a completely unique technology, characterized by less defects and more effective than silicon carbide. ...more on Wikipedia about "Polish blue laser"
Zinc sulfide (or zinc sulphide) is a chemical compound with the formula Zn S. Zinc sulfide is a white to yellow colored powder or crystal. It is typically encountered in the more stable sphalerite (cubic) crystal structure, although the wurtzite (hexagonal) form is also known. Both of these forms are intrinsic semiconductors. The sphalerite form has a band gap of 3.54 eV at 300 K while the wurtzite form has a band gap of 3.91 eV. ...more on Wikipedia about "Zinc sulfide"
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