Organic LED

 

What is Organic LED?

An organic light emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compounds which emits light in response to an electric current. This layer of organic semiconductor material is sandwiched between two electrodes. Generally, at least one of these electrodes is transparent.

 

History:

The first observations of electroluminescence in organic materials were in the early 1950s by A. Bernanose and co-workers at the Nancy-Université, France. They applied high-voltage alternating current (AC) fields in air to materials such as acridine orange, either deposited on or dissolved in cellulose or cellophane thin films. The proposed mechanism was either direct excitation of the dye molecules or excitation of electrons.

 

Advantage:

Light weight and flexible plastic substrates - OLED displays can be fabricated on flexible plastic substrates leading to the possibility of flexible organic light-emitting diodes being fabricated or other new applications such as roll-up displays embedded in fabrics or clothing. As the substrate used can be flexible such as PET, the displays may be produced inexpensively.

Wider viewing angles and improved brightness - OLEDs can enable a greater artificial contrast ratio (both dynamic range and static, measured in purely dark conditions) and viewing angle compared to LCDs because OLED pixels directly emit light. OLED pixel colours appear correct and unshifted, even as the viewing angle approaches 90° from normal.

 

Disadvantage:

Lifespan - The biggest technical problem for OLEDs was the limited lifetime of the organic materials. In particular, blue OLEDs historically have had a lifetime of around 14,000 hours to half original brightness (five years at 8 hours a day) ,but opportunity of efficacy is so much greater than LED, it is also improving year after year.

Color balance issues - Additionally, as the OLED material used to produce blue light degrades significantly more rapidly than the materials that produce other colors, blue light output will decrease relative to the other colors of light. This variation in the differential color output will change the color balance of the display and is much more noticeable than a decrease in overall luminance.

 

The challenge

 

 

Creating a symbiosis of eco-friendly nanotechnology and modern aesthetics that simply inspires, WAC Lighting continues to push the boundaries of advancement with Organic LED luminaires that transform the future of lighting into a unique platform for today.

  

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Inherently sustainable and precision engineered, the luminaires are individually crafted with the world’s most revolutionary light source in WAC’s wholly owned, zero landfill manufacturing campus. With instant on/off and dimming capabilities, the Vela family delivers mercury free, consistent beams of light without glare and a 10,000-hour rated life. The OLEDs are uniformly luminous and evenly spaced on the luminaires with utility, proportion and style.