Organic LEDs

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Overview

An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes; typically, at least one of these electrodes is transparent. OLEDs are used to create digital displays in devices such as television screens, computer monitors, portable systems such as mobile phones, handheld game consoles and PDAs. A major area of research is the development of white OLED devices for use in solid-state lighting applications. An OLED display works without a backlight; thus, it can display deep black levels and can be thinner and lighter than a liquid crystal display (LCD). In low ambient light conditions (such as a dark room), an OLED screen can achieve a higher contrast ratio than an LCD, regardless of whether the LCD uses cold cathode fluorescent lamps or an LED backlight.

Applications

OLED technology is used in commercial applications such as displays for mobile phones and portable digital media players, car radios and digital cameras among others. OLEDs have been used in most color cell phones. OLED displays were used in watches made by Fossil and Diesel.

Future Scope

OLEDs in tail lights and interior lights in future cars. Cost-efficient pre-screening of materials.

External Links

Structure and working principle of OLEDs and electroluminescent displays

Tutorial on the working principle of OLEDs at Ghent University

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