Introduction to OLED TFT Display Modules technology and light-emitting process analysis

Similar to LED, OLED is a solid-state semiconductor device having a thickness of 100-500 nm, and 200 times finer than a human hair. OLED constituted by two or three layers of organic materials; OLED in accordance with the latest design, the third layer may assist in the transfer of electrons from the cathode to the emission layer. , OLED structure
OLED consists of the following components:
The structure of the OLED
Primary (transparent plastic, glass, metal foil) - base for supporting the entire OLED.
Anode (transparent) - anode current flows through the device in electronic (an increase of electron "holes").
The organic layer - the organic layer is constituted by organic molecules or organic polymers.
Conductive layer - This layer is composed of organic plastic molecules, these molecules is transmitted by the the anode comes out of the "hole". Can be a conductive polymer polyaniline as OLED.
Emitting layer - This layer is constituted from an organic plastic molecules (different from the conductive layer), these molecules transfer electrons from the cathode from; emitting process carried out in this layer. Can be used as polyfluorene emission layer polymer.
A cathode (which may be transparent, can also be opaque, depending on the type of OLED) - when the current flow within the device, the cathode of the electron injecting circuit.
Second, OLED manufacturing
OLED production process is the most important part of the organic layer coating to the grass-roots level. The completion of this work, there are three ways:
1, vacuum deposition or vacuum thermal evaporation (VTE)
Organic molecules in the vacuum chamber body will be a slight heating (evaporation) in the form of a thin film, then these molecules condense on the lower temperature on the grass. This method is costly, but the efficiency is low.
2, an organic vapor phase deposition (OVPD)
In a low-pressure hot-wall reaction chamber, carrier gas evaporation of organic molecules transported to the low temperature on the grass-roots level, and then the organic molecules condense into a film-like. Use the carrier gas can improve the efficiency and reduce the cost of OLED Display.
3, the ink-jet printing
The inkjet technology OLED spray to the grass-roots level, like printing ink is sprayed onto the paper. Inkjet technology greatly reduce the OLED production costs, is also the OLED print to a very large surface area of ​​the film, for the production of large-sized display, for example, 80-inch large-screen television or electronic billboards.
, OLED light-emitting process
Similar to the LED, OLED light undergoes a process called Electrophosphorescent.
The specific process is as follows:
OLED device's battery or power supply applying a voltage at both ends of the OLED.
2, the current flows from the cathode to the anode, and after the organic layer (current refers to the flow of electrons).
3, the cathode to the organic molecules emitting layer output electrons.
4, the anode absorbent layer from the electronic conduction from the organic molecule. (This can be regarded as an anode to output a hole conducting layer, both of equal effect.
5, in the emitting layer and the conductive layer of the junction, electrons combined with the hole.
6, electronic encounter a hole, fill the hole (it will fall into the missing the electronic atoms in a level).
7, this process occurs, the electronic form of photons to release energy.
8 OLEDs luminous.custom lcd
9, the color of the light vary depending on the type of the emission layer of organic molecules. Production Chamber of Commerce on the same piece of OLED placed several organic thin film, so that we can have a color display.
10, the brightness or intensity of the light vary depending on the size of the current is applied. The greater the current, the higher the brightness of the light.