In the rise of the LED lighting market and the continuous development of organic EL lighting, the new generation of lighting has attracted much attention, and more and more attempts have been made to increase the performance by using new materials, making it flexible and opening up unique uses.
The first place in the 2009 news ranking of the "New Materials" Japanese Channel is the report on the practical use of SiAlON phosphor materials for white LEDs. Compared with the original silicate-based materials, the SiAlON-based materials have less change in brightness and color with respect to temperature rise. It is expected to be used for LCD TV backlights and LED lighting to achieve a business scale of billions of yen per year.
Ranked 5th in the rankings is the use of highly conductive transparent resin electrodes instead of ITO and the production of flexible organic EL lighting panels. Although it is possible to manufacture a new concept product by achieving flexibility, it is necessary to form a film on a resin film at a low temperature. However, ITO has a problem that conductivity cannot be improved in a low temperature process. According to reports, in the trial production, PEDOT/PSS (3,4-ethylenedioxythiophene/polystyrenesulfonate sodium)-based transparent resin was used, and the conductivity was improved by about 6 times.
In 2009, not only has the research on new generation lighting progressed, but research on PEDOT/PSS materials has also made progress. For example, Bridgestone delivered a speech at the "SIDDisplayWeek2009" seminar, announcing that the company's electronic paper transparent electrode instead of ITO PEDOT / PSS has been put into practical use. Japan's Yamanashi University has also successfully produced a PEDOT/PSS film with a transmittance of 89% and a conductivity of 443 S/cm. The university said that in the previously published PEDOT/PSS film with a transparency of nearly 90%, the product was realized. The highest conductivity. In the future, the trend to replace ITO with PEDOT/PSS materials will accelerate.
The news that electronic materials such as carbon nanotubes (CNTs) and graphenes are used for electronic components is steadily advancing. It is the fourth-ranked Fujitsu exhibition "NanoTech2009".
As mentioned above, most of the carbon-based materials have been studied for CNT-based transistors in the channel layer, and various carbon materials such as graphene have been used. Graphene is a six-membered ring sheet in which a benzene ring is connected to a honeycomb, and a transistor in which a channel layer is made of graphene has an advantage of high carrier mobility and easy manufacture.
In addition to transistors, research on the use of bumps and wiring, etc., which are further considered for practical use, has also attracted attention. If CNTs are used for bumps, LSI is not easily broken even under thermal stress and mechanical stress, and it is also possible to use for heat dissipation and inductors. For wiring, it is hoped that CNTs will be able to smoothly perform uniform wiring of copper (Cu) instead of further development.
Editor: China Lighting Network Feng Yaoyuan
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