OLED production organic coat to base on the three methods

OLED production process is the most important part of the organic layer in accordance with the requirements of the driven matrix coat to the grassroots, form the key light emitting display unit. OLED is a kind of solid materials, the high precision coating technology development is the key to the transition of OLED. General to complete this work, there are three kinds of methods:

1, vacuum deposition, or vacuum thermal evaporation ( VTE)

in the vacuum chamber will be slight heating organic molecules in the body ( Evaporation) And then the molecules in the form of film condensation on low temperature at the grass-roots level. Broad scope, this method can grow almost all semiconductor compounds and alloys, very suitable for the growth of heterogeneous structure material, can grow thin epitaxial layer, and can get very steep interface transition, growth is easy to control, can grow high purity materials, epitaxial layer of large area uniformity is good, can be mass production, but used in the low efficiency of OLED products.

2, organic vapor deposition ( OVPD)

　　OVPD( Organic vapor deposition) Is developed by German ace strong company, the process design improvement can be productive, relative to the evaporation technology can reduce the manufacturing cost. The technology opened a as upgrading of VTE. With excellent repeatability and process stability and uniformity of significant film and accurate control of doping, which laid a foundation for batch production indicates rate, at the same time reduces the maintenance and cleaning requirements, thus downgrade the material consumption, has a great potential to improve material utilization.

OVPD in a low-pressure hot wall reaction cavity, the carrier will be transported to the low-temperature evaporation of the organic molecules at the grass-roots level, then organic molecules will be condensed into a film. Using the carrier can improve the efficiency and reduce the cost of the OLED. However, the technology also can't break out of the preparation of large area glass and color OLED bottlenecks.

3, inkjet printing, and emerging technologies such as quoted

OLED layer coating, is based on vapor deposition technology in the traditional way, the new method is based on transfer printing and printing technology. For example, using ink-jet technology can spray the OLED to the grassroots, like when the printing ink is sprayed onto the paper.

emerging way of transfer printing technology development and the development by samsung and 3 m; Printing technology development and the development is mainly composed of epson. The greatest advantage of the two methods is to improve the utilization rate of materials and simplify the production process, but its technology and material has a certain monopoly.

in the printing technology, and have different types of technology. For example, laser induced thermal imaging ( 立体坛城) Technology, which is mainly with a flyback near infrared laser imaging was carried out on the thermal transfer film exposure. LITI transfer printing is a unique advantage of laser addressing high-resolution graphics processing method, transfer printing thickness is uniform and multi-layer composite transfer ability and have the large size of extensibility motherboard glass and so on.

all in all, in a variety of printing technology as the main body of the new OLED layer coating technology is becoming the important power of the industry growth route and equipment. This technology greatly reduces the production costs of OLED, can the OLED print to film on the surface area is very large, to produce a large display, such as 80 inches of big screen TV. These technical breakthrough, will become the basis of large-scale practical OLED products.

edit: Steve