Beware of OLEDs in General Lighting Applications
According to the chief analyst in the LED Lighting group at ElectroniCast, OLED panels (Organic Light Emitting Diode) are forecast to eventually be a strong competitor to both the fluorescent and LED-based linear tube. OLEDs are often referred to as OLED devices, OLED light sources, OLED panels or sub-panels, and OLED tiles.
OLED Description 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 emit light in response to an electric current. This layer of organic semiconductor material is situated between two electrodes. Generally, at least one of these electrodes is transparent.
Pioneered by Kodak in the late 1980s, OLED technology and its practical applications have generated more than 1,700 issued and pending Kodak patents worldwide.
OLEDs are paper-thin, flexible and lightweight electronic devices, which consume up to 70 percent less energy compared to conventional light sources. OLED technology has already been put into practical use in displays, but has shown remarkable progress in recent years in terms of improved brightness and longer lifespan, which makes OLED technology a prime candidate for the next generation of energy-saving lighting.
The major distinction between inorganic (I) and organic (O) LEDs for the application of lighting is the form factor. OLEDs produce light at relatively low intensity spread over large areas, while LEDs (ILEDs) are more compact sources. OLED is a surface light source, instead of from point light sources such as LEDs. A key structural difference is that OLEDs are created using organic semiconductors (such as those that make up organic solar cells), while LEDs are built in crystals from an inorganic material.
In most OLEDs the current flows through organic materials confined between planar electrodes with a separation that is typically only about 100nm. Multiple layers are required to assure balanced transport of electrons and holes and the production of light with the desired color qualities. Most devices use red, green and blue emitters that can be arranged in several configurations to produce white light.
Contact: Stephen Montgomery...
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