LIGHT EMITTING DIODES

LIGHT EMITTING DIODES (LED'S) ARE DEVICES DESIGNED TO EFFICIENTLY CONVERT ELECTRICAL ENERGY INTO ELECTROMAGNETIC RADIATION, MOST OF WHICH IS VISIBLE TO THE HUMAN EYE. SOME OF THE DISCIPLINES INVOLVED IN THE UNDERSTANDING AND UTILIZATION OF LED'S ARE REVIEWED, WITH EMPHASIS ON THE III-V SEMICONDUCTING COMPOUNDS AND GALLIUM PHOSPHORUS, LED'S IN PARTICULAR. SALIENT FEATURES OF PHOTOMETRY, THE PHYSICS OF ELECTRICAL INJECTION AND LUMINESCENCE, AND THE DESIGN OF LED'S ARE DISCUSSED IN DETAIL, FOLLOWED BY A SURVEY OF PROMINENT APPLICATIONS FOR THE VARIOUS LED'S. IN THE PAST THREE YEARS THE EFFICIENCY OF THESE DEVICES HAS INCREASED BY A FACTOR OF TWENTY, THEIR COST HAS DECREASED BY THE SAME FACTOR, AND THEIR RELIABILITY HAS IMPROVED BY ALMOST FIVE ORDERS OF MAGNITUDE. BECAUSE OF THIS PROGRESS AND THE FACT THAT LED'S ARE COMPATIBLE WITH SILICON INTEGRATED CIRCUITS, THE AUTHORS FORECAST A BRIGHT FUTURE FOR THESE DEVICES IN THE APPLICATIONS OF INDICATOR LIGHTS, SYMBOLIC DISPLAYS, AND PICTURE DISPLAYS. /AUTHOR/

• Supplemental Notes:
  • Vol 60, No 2, PP 156-224
• Authors:
  • Bergh, A A
  • Dean, P J
• Publication Date: 1972-2

Media Info

• Serial:
  • Ieee Proceedings

Subject/Index Terms

• TRT Terms: Diodes; Electromagnetic waves; Indicators (Instruments); Information display systems; Light; Luminescence; Photometry; Semiconductors
• Old TRIS Terms: Displays
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00226252
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 10 1972 12:00AM