Screens for TVs, smartphones or other displays could be made with a new kind of organic LED material. The material maintains sharp color and contrast while replacing the heavy metal with a new hybrid material.
Layering an organic material on top of 2D materials achieves stable, fast phosphorescent light emission without using expensive and hazardous heavy metals
"We found a way to make a phosphorescent organic molecule that can emit light on the microsecond scale, without including heavy metals in the molecular framework," said Jinsang Kim, U-M professor of materials science and engineering and co-corresponding author of the study published in Nature Communications.
The conversion has to do with the electron's spin. Each electron has a partner in its ground state, and a quantum mechanical rule -- Pauli Exclusion Principle -- demands that they spin in opposite directions. But when an electron slides into that higher rung, it can end up spinning in either direction because each electron is now alone in its orbital. It only remains opposite its partner a quarter of the time, and this is the case that results in fluorescence.
Light emission happens entirely within the organic material without having the weak metal-organic ligand bonding, helping the material last longer. Phosphorescent OLEDs that rely on heavy metals also use the metals to help produce the color, and the weaker chemical bonds between the metal and organic material can break apart when two excited electrons come into contact, dimming out the pixel.
"We don't yet fully understand what causes this triplet character in the ground state because this violates the Pauli Exclusion Principle. That is very impossible, but looking at the measurement data, yes, that seems to be the case," Kim said."That's why we have a lot of questions about what really makes that happen."
This work was supported by the National Research Foundation of Korea grant funded by the Korea government and START grant from the U-M College of Engineering.
Materials Science Chemistry Inorganic Chemistry Spintronics Research Computers And Internet Computer Graphics Artificial Intelligence
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