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Review
Nature Photonics 2, 77 - 84 (2008)
doi:10.1038/nphoton.2007.293
Ultraviolet light-emitting diodes based on group three nitrides
Asif Khan1, Krishnan Balakrishnan1 & Tom Katona1
Abstract
Light-emitting diodes with emission wavelengths less than 400 nm have been developed using the AlInGaN material system. For devices operating at shorter wavelengths, alloy compositions with a greater aluminium content are required. The material properties of these materials lie on the border between conventional semiconductors and insulators, which adds a degree of complexity to the development of efficient light-emitting devices. A number of technical developments have enabled the fabrication of LEDs based on group three nitrides (III-nitrides) that emit in the UV part of the spectrum, providing useful tools for a wealth of applications in optoelectronic systems.
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