Light emitting diode for use as an efficient emitter or detector of light at a common wavelength and method for forming the same

  • US 5,448,082 A
  • Filed: 09/27/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 09/27/1994
  • Status: Expired due to Term
First Claim
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1. A light emitting diode (LED) capable of alternately functioning as an efficient emitter and detector of light at a common wavelength, comprising:

  • a graded bandgap Ga1-x Alx As semiconductor material with first and second semiconductive regions that form a p-n junction, the value of x decreasing monotonically from a value greater than 0.08 at the diode surface on the N side of said junction to a value not less than zero at the diode surface on the P side of said junction and having a value greater than 0 and less than 0.08 at said junction, andelectrical contacts on said first and second conductive regions for applying a voltage across said conductive regions.

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