The difference between OLED and PLED
Organic electroluminescence technology is currently developed in the world, according to the different materials can be roughly divided into two technologies, one is the development of polymer materials as the light-emitting layer technology, referred to as PLED, the other is the development of small molecules as the light-emitting layer Material, referred to as OLED, and what is the difference between OLED and PLED? The following are compared in terms of materials, manufacturing process, equipment, component characteristics, patent authorization, etc., because the two technologies have their own advantages and disadvantages.
Material: The common characteristics of OLED and PLED materials are that they contain a conjugated chemical structure and have a high fluorescence efficiency. However, the molecular weight of the two is quite different. The molecular weight of small molecule materials is generally about hundreds. And the polymer is between tens of thousands and millions. As far as the acquisition of materials is concerned, the synthesis and purification of small-molecule materials are relatively simple, and the requirements for mass production and purity of materials are relatively easy to achieve. Relatively speaking, the material properties of small molecules are higher than that of molecules, but the thermal stability and mechanical properties are better with polymers.
In terms of equipment: due to the difference in material characteristics, the device manufacturing equipment will be different. Small molecules are deposited by thermal evaporation (thermal evaporaTIon) to deposit multiple layers of organic films. In order to avoid mutual contamination between different materials, it is necessary to use more The vacuum equipment of the cavity, so the cost of the equipment is higher. PLEDs are mostly coated by spin-coaTIng, which is similar to the process of CD-R, with lower equipment cost, and PLED can be coated by roller or screen, which is more beneficial for large-size displays development of.
Process: Although spin-coaTIng can be used to apply film faster, PLED still needs to be baked to remove the solvent after coating, so the film formation time is not shorter than OLED, which will affect the mass production process. Yield. At present, many large-scale OLED manufacturers have produced full-color display prototypes, but PLED is still limited by the bottleneck of independent positioning of red, green and blue pixels. So far, it has been unable to launch full-color PLED displays. Currently, inkjet positioning Will be a more feasible solution.
In terms of device characteristics: The luminous efficiency of the two devices developed so far can be higher than 15 lm / W, PLED can even exceed 20 lm / W, and PLED can tolerate higher current density and higher temperature operation.
Patent licensing: At present, CDT hopes to accelerate the commercialization of PLED, and its attitude towards PLED technology transfer and patent licensing has become more positive, compared with Kodak.
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