Researchers from Yonsei University, in collaboration with LG Display, have finally understood why magnesium fluoride improves the performance of OLED devices. LG Display has been using the material in its WOLED TV panels as a hole injection layer, but it was not understood what is the actual mechanism behind the performance improvement.
Magnesium fluoride has been known as an insulator material, which should have made it a poor HIL material. However, it was now discovered that when magnesium fluoride mixes with organic semiconductors it actually pulls electrons from the organic molecules. Even without external stimuli, electron transfer occurs naturally the moment organic materials and magnesium fluoride are mixed.
It was found that magnesium fluoride increased positive charge carriers by 50X once it is mixed with the organic molecules. This makes the charge flow much smoother, which eventually enables a more efficient OLED device emission.
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