[High-tech LED News] Recently, the RIKEN Innovation Center and the Japanese Canon Company have developed a new technology that can replace precious metals with copper, thereby further reducing the production cost of OLEDs.
According to the Japan Institute of Physical and Chemical Research, copper complexes are relatively inexpensive, and the cost is 1/2000 of the ruthenium complex. If it can be applied, it will inevitably reduce the production cost of OLED. However, the external quantum efficiency (EQE) of copper complexes was relatively low before the new study. Although this complex can be easily activated to a high-energy state, since it is distorted, it dissipates more energy than it emits in the form of light, and thus the luminous efficiency is far less than that of the ruthenium complex.
To solve this problem, the researchers changed the molecular environment in which copper is located, encapsulating copper ions in several organic ligands. This method has been successful in emitting green-emitting OLEDs, and the external electron efficiency of the modified copper complex is almost equivalent to that of the ruthenium complex.
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