Electroluminescent devices formed using semiconductor nanocrysta

Details Electroluminescent devices formed using semiconductor nanocrysta Electroluminescent devices formed using semiconductor nanocrysta

1994-04-29

1996-07-16

Patel, Nimeshkumar D.

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313498, 313499, 445 24, 445 58, H05B 3322

Patent

active

055370004

ABSTRACT:
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.

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