11498-patent-wo-1996

Data for reference 11498-patent-wo-1996

Monolithic Array of LEDs for the Generation of Light at Multiple Wavelengths and its use for Multicolor Display Applications

S. Strite

World Intellectual Property OrganizationPatent Number 11498

1996.

Disclosed are monolithic multicolor arrays of LEDs and their use for multicolor display applications. A multicolor LED array comprises a conductive substrate, a conductive semiconductor layer, a compensated semiconductor layer on top of the conductive semiconductor layer, and contacts for biasing individual LEDs. The compensated semiconductor layer serves as the active layer of the LEDs for the generation of light. The multicolor capability of the active layer is achieved by using impurity related electronic transitions as radiative recombination processes, the energy of these transitions being dependent on the doping conditions, and by introducing a laterial variation of the doping conditions of the active layer. This lateral variation is tailored such that a lateral variation of the color of the light generated in the active layer occures due to the injection of carriers into the active layer, thus leading to LEDs with different emission wavelengths. The use of wide bandgap semiconductors such as InGaAlN for the active layer allows for fabricating monolithic multicolor LED arrays capable of generating different emission lines, all together spanning the entire spectrum between near infrared and ultraviolet.

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Contributed by S. Strite from internet-gw.zurich.ibm.ch. on Wednesday, August 7, 1996 7:59:37 AM

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