A symbol for the chemical element silver.



A symbol for the chemical element aluminium.



A chemical symbol consisting of the materials aluminium, titan and nitrogen.

AM-[ ]

Active Matrix

Active matrix is a type of addressing scheme of pixels used in large flat panel displays. In this method of switching individual elements (pixels) of a flat panel display, each pixel is attached to a transistor and capacitor which actively maintain the pixel state while other pixels are being addressed. This is to be contrasted with the older passive matrix technology in which each pixel must maintain its state passively, without being driven by circuitry.


Active Matrix Organic Light Emitting Diode

Is a display technology for use in mobile devices and televisions. OLED describes a specific type of thin-film display technology in which organic compounds form the electroluminescent material, and active matrix refers to the technology behind the addressing of pixels.



A chemical symbol consisting of the materials silver, palladium and copper.

Blackbody Radiators

Blackbody Radiators

A blackbody is a theoretically ideal radiator and absorber of energy at all electromagnetic wavelengths.


Charged Coupled Device

Charge coupled devices are widely used as sensors in cameras, video cameras, and scanners. In CCDs charge is generated by received photons. The generated charge is accumulated and transferred to insulated electrodes. At the insulated electrodes the charges are read out and converted to a digital value.


Correlated Color Temperature

A specification for white light sources used to describe the dominant color tone along the dimension from warm (yellows and reds) to cool (blue).
Lamps with a CCT rating below 3200 Kelvin are usually considered warm sources, whereas those with a CCT above 4000 Kelvin usually considered cool in appearance. Temperatures in between are considered neutral in appearance. The temperature at which the heated black body radiator matches the color of the light source is that source’s color temperature.


Cambridge Display Technologies

A UK-based company (owned by Sumitomo Chemical) that develops polymer-based OLED (P-OLED) technologies.

CE= (cd /A)

Current Efficiency

Current Efficiency is a measure for the efficiency of an OLED. Current Efficiency is given as the ratio of the brightness and the electrical current at which the brightness is achieved.


compact fluorescent lamp

Charge Transport

Charge transport is the process of charges passing from one molecule to an other. In an OLED charges (here: electrons, holes) are transported from the electrodes to the emission layer under an electric field.


International Commision on Illumination (Commision Internationale de le Èclairage)

CIE is the international authority on the characterization of light, illumination, colour, and colour spaces. 


Color Rendering Index

Light sources vary in their ability to accurately reflect the true colors of objects. The color rendering index CRI scale is used to compare the effect of a light source on the color appearance of its surroundings. The higher the color rendering index, the less color shift or distortion occurs.


Chemical Vapor Deposition

Chemical Vapor Deposition is the most common thin film deposition method in advanced semiconductor manufacturing. One or more volatile chemicals are deposited onto a substrate. The chemicals react with each other or the substrate to form the desired product. Residuals and by-products are removed with a gas flow from the deposition chamber. 

Direct Emission

Direct-emission OLEDs do not use color filters. Each pixel is made from RGB sub-pixels.


Doping is a technical concept or new technology in the semiconductor industry to improve and increase the performance of different devices. In the case of most of the conventional OLEDs, charge transport is inefficient due to the poor conductivity of transport layers (both hole and electron transport layers). With doping technology, the conductivity of transport layers can be increased by orders of magnitude; one can create highly efficient OLEDs with low driving voltage. 


Electron Affinity

The energy released when an electron is added to an atom. If the electron affinity is negative, then energy is required to attach an electron to the atom.


Eectron Block Layer

This layer confines electrons to the emitting layer.