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Electroluminescent devices formed using semiconductor nanocrystals as an electron transport media and method of making such electroluminescent devices

Patent ·
OSTI ID:870515
 [1];  [2]
  1. Oakland, CA
  2. Springfield, NJ
+ Show Author Affiliations
An electroluminescent device is described, as well as a method of making same, wherein the device is characterized by a semiconductor nanocrystal electron transport layer capable of emitting visible light in response to a voltage applied to the device. The wavelength of the light emitted by the device may be changed by changing either the size or the type of semiconductor nanocrystals used in forming the electron transport layer. In a preferred embodiment the device is further characterized by the capability of emitting visible light of varying wavelengths in response to changes in the voltage applied to the device. The device comprises a hole processing structure capable of injecting and transporting holes, and usually comprising a hole injecting layer and a hole transporting layer; an electron transport layer in contact with the hole processing structure and comprising one or more layers of semiconductor nanocrystals; and an electron injecting layer in contact with the electron transport layer for injecting electrons into the electron transport layer. The capability of emitting visible light of various wavelengths is principally based on the variations in voltage applied thereto, but the type of semiconductor nanocrystals used and the size of the semiconductor nanocrystals in the layers of semiconductor nanometer crystals may also play a role in color change, in combination with the change in voltage.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
Assignee:
Regents, University of California (Oakland, CA)
Patent Number(s):
US 5537000
OSTI ID:
870515
Country of Publication:
United States
Language:
English

References (5)

Electroluminescence of doped organic thin films journal May 1989
Electroluminescence and electrical transport in poly(3‐octylthiophene) diodes journal July 1992
Semiconductor nanocrystals covalently bound to metal surfaces with self-assembled monolayers journal June 1992
Organic electroluminescent diodes journal September 1987
Poly( p ‐phenylenevinylene) light‐emitting diodes: Enhanced electroluminescent efficiency through charge carrier confinement journal December 1992

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