Transparent Mirrorless (TML) LEDs

Tech ID: 25240 / UC Case 2007-273-0

Brief Description

Minimizes the re-absorption of LED light by using transparent conductive oxide electrodes (ITO or ZnO) instead of mirrors. 

Background

Conventional LEDs utilize mirrors in order to increase the front emissions of particular wavelengths of light by reflecting the LED light forward. In order to increase the output power for the front side of the LED, the emitting light is reflected by the mirror on the backside of the sapphire substrate. These reflected emissions are partly re-absorbed by the active layer of the LED, reducing the output power and efficient of the LED.

Description

An invention created by UC Santa Barbara researchers minimizes the re-absorption of LED light by using transparent conductive oxide electrodes (ITO or ZnO) instead of mirrors. This type of LED also employs a gallium nitride substrate instead of a sapphire substrate in order to create more efficient quantum wells and utilizes textured phosphor layers in order to increase luminous efficacy. The combination of transparent conductive oxide electrodes with a nitride LED and a shaped lens results in high levels of light extraction.

Advantages

  • Reduces reflection
  • Minimizes light re-absorption
  • Increases efficiency

Applications

  • Light emitting diodes (LEDs)

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 7,781,789 08/24/2010 2007-273
 

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Keywords

indled, indssl, TCO, indfeat

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