According to a recent report by the American Physicists Organization Network, Japanese researchers have developed a new technology that can substitute copper for the precious metals used in the current production of OLEDs (Organic Light Emitting Diodes), thereby further reducing their costs.
OLED is a kind of display and lighting technology that is widely used nowadays, especially its application on the display is favored by many consumers. Compared with the traditional LCD (liquid crystal display), OLED display has the characteristics of high contrast, thin thickness, wide viewing angle, low energy consumption, fast response, and brilliant colors, and is considered as the next generation of green display technology.
On the LCD, each pixel is actually a small filter, and a large backlight behind these pixels is emitted. However, OLEDs are different. Each pixel is a small light source, so no backlight is needed. This means that when it is necessary to display black, the pixels of the area can be completely extinguished without consuming power. Therefore, compared with the LCD, OLED display better display, but also more energy-saving and environmental protection. However, in the production of OLEDs, precious metals such as antimony, which have less reserves, are needed in the production of OLEDs, which, to some extent, has created obstacles for the promotion of OLED technology.
A few days ago, scientists at the RIKEN Innovation Center, Masahide Ozawa, and researchers at Canon Inc. in Japan developed a new method to replace these precious metals with copper.
Masahide Ozawa said that long ago people knew that copper complexes were potential alternatives. Copper complexes were cheap and the cost was 1/2000 of ruthenium complexes. If they could be applied, they would reduce the production of OLEDs. cost. However, the copper complexes had relatively low external quantum efficiency (EQE) before the new study. Although this complex can be easily activated to a high-energy state, it distorts because it dissipates more energy than it emits in the form of light. Therefore, the luminous efficiency is far lower than that of a ruthenium complex.
To solve this problem, the researchers changed the molecular environment in which copper was placed and wrapped copper ions in several organic ligands. Experiments have confirmed that their method has been successful on green-emitting OLEDs, and the external electron efficiency of this modified copper complex is almost equivalent to that of the ruthenium complex.
In the next step, the team will deploy the copper complex in the work equipment and verify its effectiveness in displaying light waves other than green light.
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