OLED/PLED-Info Website --> OLED-Display.net (Organic light emitting diode)


What is OLED?

We give you overview for the organic light emitting technology!

OLED ("Organic light emitting diodes") displays are considered as the screens of the future. Thin organic layers serve these displays as a source of light, which offers significant advantages in relation to conventional technologies:

  • brighter and more brilliant picture
  • unlimited viewing angle
  • low power consumption
  • economic production
  • fast "response time"
The prerequisites for a breakthrough of this technology in the market, which is estimated in 2010 to be worth over USD 2 billion, are the optimization of certain critical performance data such as lifetime and efficiency. This requires innovations in materials meaning that chemistry will decide about the future and the success of the OLED technology.

OLEDs - Organic Light-Emitting Diodes are the light of the future

Video wallpaper - just a millimeter thick - could transform your living room wall into a flat screen and electronic film as thin as a sheet of paper could serve as your screen for the internet, the news, images or games. In future, all of this will be possible thanks to organic light-emitting diodes, so-called OLEDs. In this episode you will learn more about this revolution in lighting technology:

OLED Podcast from BASF! Learn all about OLED Technology!
Date: 09.05.2007 - Duration: 9:37 - Size: 8,81 MB

 

Organic light emitting technology was invented by Eastman Kodak in the early 1980s.A Kodak researcher by the name of Ching Tang noticed that if you put an electrical current through an organic material, it glowed green. This is where the idea behind OLED came from. Step to step from organic materials to OLED-TV
organic-material

material

 

oled-material
[photo iapp.de]

oled-sony


Why are the OLED-Display technology even better than the LCD or plasma technology?

OLEDS advantages:

like ultra-thin,
flexible or transparent displays
Low power consumption
Greater brightness
Better durability

 

Low power consumption is the reasen why OLED is a better choice for portable devices. It also makes OLEDs, and a candidate to be the white-light "bulb" of the future Greater brightness.
Light sources
based on organic electroluminiscent materials offer the potential to make a high light intensity possible at a low energy consumption on mechanically flexible substrates." said project head Prof. Dr. Karl Leo (IAPP) about the high expectations.

- The screens are brighter, and have a fuller viewing angle. Better durability - OLED-Displays can operate in a temperature range Lighter weight - the screen can be made very thin, and can be 'printed' on flexible surfaces.

OLED-Structure:

oledstructure

Look at this amazing Video from CNET! Interview with vice president of Universal display about the future of OLED-Displays. You see how Universal Display is working on OLED technology:

Many electronic appliances are at the threshold of a revolution that began with the discovery of polymeric conductors in the 1970s. Polymeric materials, which have historically been classified exclusively as electrical insulators, are now finding varied applications as both conductors and semiconductors. Expensive ceramic semiconductors that are brittle and difficult to pattern have historically been the driving force of the digital age for the last fifty years. But now a combination of properties exist today in polymers that are making many previously impossible appliances a reality.

Within a very short time organic conductors have been developed with the conductivity of metals such as copper, while organic electronics has evolved photoelectric cells, diodes, light emitting diodes, lasers and transistors. The result is that a class of plastic materials referred to as conjugated polymers are fast displacing traditional materials such as natural polymers (e.g. wood), metals, ceramics and glass in many applications owing to the combination of their physical/mechanical properties (light weight combined with physical strength) and ease of processibility (the ability to mould the shape of plastic materials or extrude into sheet and rod through a die).

What this means is that OLEDs can be deployed in a wide range of electronic devices and can be used extensively throughout any given device. Active components of displays can be polymers, substrates can be polymers, logical electronics can be polymers, and so on. In the years ahead OLEDs will see applications in personal computers, cell phones, televisions, general wide area lighting, signs, billboards, communications and any of a number of information appliances.

The basic OLED cell structure consists of a stack of thin organic layers sandwiched between a transparent anode and a metallic cathode. The organic layers comprise a hole-injection layer, a hole-transport layer, an emissive layer and an electron-transport layer. When an appropriate voltage (typically a few volts) is applied to the cell, the injected positive and negative charges recombine in the emissive layer to produce light (electroluminescence). The structure of the organic layers and the choice of anode and cathode are designed to maximise the recombination process in the emissive layer, thus maximising the light output from the OLED device. Both the electroluminescent efficiency and control of colour output can be significantly enhanced by "doping" the emissive layer with a small amount of highly fluorescent molecules.
AM OLED = Active Matrix OLED device

  • FOLED = Flexible Organic Light Emitting Diode (UDC)
  • OLED = Organic Light Emitting Diode/Device/Display
  • PhOLED = Phosphorescent Oragnic Light Emitting Diode (UDC)
  • PLED = Polymer Light Emitting Diode (CDT)
  • PM OLED = Passive Matrix OLED device
  • POLED = Polymer Oragnic Light Emitting Diode (CDT)
  • RCOLED = Resonant Coloe Oragnic Light Emitting Diode
  • SmOLED = Small Molecule Ogranic Light Emitting Diode (Kodak)
  • SOLED = Stacked Oragnic Light Emitting Diode (UDC)
  • TOLED = Transparent Oragnic Light Emitting Diode (UDC)