Nano structured leds

Abstract

An embodiment relates to a nanowire-containing LED device with optical feedback comprising a substrate, a nanowire protruding from a first side the substrate, an active region to produce light, a optical sensor and a electronic circuit, wherein the optical sensor is configured to detect at least a first portion of the light produced in the active region, and the electronic circuit is configured to control an electrical parameter that controls a light output of the active region. Yet, another embodiment relates to an image display having the nanowire-containing LED device with optical feedback.

What is claimed: 
     
         1 . A device comprising a nanowire comprising a light-emitting diode (LED) portion, wherein the LED portion of the nanowire has a structure that supplies an electrical bias to the LED portion of the nanowire in combination with an optical sensor. 
     
     
         2 . The device of  claim 1 , wherein the LED portion comprises a PN junction or a PIN-junction. 
     
     
         3 . The device of  claim 1 , further comprising an electrical circuit configured to control the electrical bias. 
     
     
         4 . The device of  claim 3 , wherein an output of the optical sensor is an input to the electrical circuit. 
     
     
         5 . The device of  claim 3 , wherein the electrical circuit is configured to control the electrical bias such that light output of the LED portion is maintained substantially constant irrespective of a temperature of the LED portion within an operating temperature range of the LED portion. 
     
     
         6 . The device of  claim 3 , wherein the electrical circuit is configured to control the electrical bias such that light output of the LED portion is maintained substantially constant irrespective of composition variations of the LED portion. 
     
     
         7 . The device of  claim 1 , further comprising a substrate, wherein the optical sensor is in the substrate and surrounds the nanowire. 
     
     
         8 . The device of  claim 1 , wherein the optical sensor is configured to detect at least a first portion of a light produced by the LED portion. 
     
     
         9 . The device of  claim 1 , wherein at least a portion of light emitted from the LED portion is infrared. 
     
     
         10 . The device of  claim 1 , wherein the nanowire has a diameter above 100 nm. 
     
     
         11 . The device of  claim 1 , wherein the nanowire comprises GaAs. 
     
     
         12 . An image display comprising the device of  claim 1 . 
     
     
         13 . A device comprising a nanowire comprising a light-emitting diode (LED) portion, a structure that supplies an electrical bias to the LED portion, an optical sensor configured to measure an intensity of light produced by the LED portion, and a controller configured to control the electrical bias based on the intensity. 
     
     
         14 . The device of  claim 13 , wherein the optical sensor surrounds the nanowire. 
     
     
         15 . The device of  claim 13 , wherein the controller is configured to maintain light output of the LED portion substantially constant, irrespective of a temperature of the LED portion, composition variations of the LED portion, or both. 
     
     
         16 . An image display comprising the device of  claim 13 . 
     
     
         17 . An image display comprising a plurality of pixels, wherein at least one of the plurality of pixels comprises a nanowire wherein the nanowire comprises a light-emitting diode (LED) portion, wherein the LED portion of the nanowire has a structure that supplies an electrical bias to the LED portion of the nanowire in combination with an optical sensor; wherein the LED portion is operable to emit a first color. 
     
     
         18 . The image display of  claim 17 , wherein the device comprises a second LED for emitting a second color different from the first color, and a third LED for emitting a third color different from both the first and second colors. 
     
     
         19 . The image display of  claim 17 , wherein the image display does not include a color filter. 
     
     
         20 . The image display of  claim 17 , wherein the image display comprises a television system on a chip or a micro-display. 
     
     
         21 . The image display of  claim 17 , further comprising a lens configured to project the image.