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More Molecules Found for Use in OLED Displays

Category: Science & Technology
Posted: 01:03PM
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For years now, organic light emitting diodes (OLEDs) have promised us more efficient and potentially cheaper displays that also offer better color reproduction and contrast. So far though, OLED displays have been all but restricted to certain smartphones with LCD screens beating them out on larger scales. Thanks to researchers at Harvard University, MIT, and Samsung though, that could change in the future.

In any modern display, each pixel is made of smaller sub-pixels that emit red, green, and blue light. By varying how much light is emitted by each sub-pixel, any other color can be produced. The problem with OLEDs has been that the blue sub-pixels are often inefficient at producing blue light. To compensate for this, manufacturers instead use organometallic molecules that also contain expensive transition metals. To remove these metals and thereby cut costs, the researchers created an advanced machine learning algorithm to analyze and model over one million molecule candidates. The best 2500 of these were then given to experimental collaborators to consider their potential via a web application.

In the end the team had hundreds of molecules that should perform as well as or better than the best metal-free OLEDs known of today. Being completely organic, OLEDs made with these molecules could potentially be cheaper and thus easier to produce at the large sizes of televisions. This approach can also be applied to find organic molecules for other applications, such as flow batteries, solar cells, and organic lasers.

Source: Harvard University



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