Technologies | Research | LEDs | Light Conversion | Machine Learning | Oct 23, 2018

New Algorithm Can More Quickly Predict Phosphor Materials for LEDs

Jakoah Brgoch, assistant professor of chemistry at the University of Houston, and members of his lab published a paper on Oct. 22 in Nature Communications describing how machine learning speeds discovery of new materials. By scanning a huge number of compounds for their key attributes they were looking for a new light conversion material that could be used in white LEDs.

The researchers have devised a new machine learning algorithm that is efficient enough to run on a personal computer and predict the properties of more than 100,000 compounds in search of those most likely to be efficient phosphors for LED lighting. They then synthesized and tested one of the compounds predicted computationally – sodium-barium-borate – and determined it offers 95 percent efficiency and outstanding thermal stability.

The researchers used machine learning to quickly scan huge numbers of compounds for key attributes, including Debye temperature and chemical compatibility. Brgoch previously demonstrated that Debye temperature is correlated with efficiency.

LED, or light-emitting diode, based bulbs work by using small amounts of rare earth elements, usually europium or cerium, substituted within a ceramic or oxide host – the interaction between the two materials determines the performance. The paper focused on rapidly predicting the properties of the host materials.

Brgoch said the project offers strong evidence of the value that machine learning can bring to developing high-performance materials, a field traditionally guided by trial-and-error and simple empirical rules. “It tells us where we should be looking and directs our synthetic efforts,” he said.

Brgoch collaborates with the UH Data Science Institute and has used the computing resources at the UH Center for Advanced Computing and Data Science for previous work. The algorithm used for this work, however, was run on a personal computer.

The project started with a list of 118,287 possible inorganic phosphor compounds from the Pearson’s Crystal Structure Database; the algorithm whittled that to just over 2,000. Another 30 seconds and it had produced a list of about two dozen promising materials. That process would have taken weeks without the benefit of machine learning, Brgoch said.

His lab does machine learning and prediction, as well as synthesis, so after agreeing the algorithm-recommended sodium-barium-borate was a good candidate, researchers created the compound. It proved to be stable, with a quantum yield or efficiency of 95 percent, but Brgoch said the light produced was too blue to be commercially desirable. That wasn’t discouraging, he said. “Now we can to use the machine learning tools to find a luminescent material that emits in a wavelength that would be useful.

“Our goal is to make LED light bulbs not only more efficient but also improve their color quality, while reducing the cost.”

More to the point, the researchers said, they demonstrated that machine learning can dramatically speed the process of discovering new materials. This work is part of the Brgoch  research group’s broader efforts to using machine learning and computation to guide their discovery of new materials with transformative potential.

About the Research Team:

In addition to Brgoch, researchers on the paper include Ya Zhuo and Aria Mansouri Tehrani, graduate students in Brgoch’s lab, former post-doctoral researcher Anton O. Oliynyk and recent Ph.D. graduate Anna C. Duke.

Reference:

The original paper has been published on October 22nd at www.nature.com/articles/s41467-018-06625-z 

FEATURED

EzyLED™ Reduces Circuit Driver Complexity

EzyLED™ Reduces Circuit Driver Complexity American Bright, a global LED lighting solutions manufacturer, announced a series of EzyLED 3030. American Bright's EzyLED™ is a proprietary LED device with a built-in IC. This patented design drastically reduces the need for additional circuitry and other on-board components making it the ideal ... Read more »

FEATURED

On-the-Fly Light Measurement of Modulated LEDs with DSP 200

On-the-Fly Light Measurement of Modulated LEDs with DSP 200 Instrument Systems addresses increasing demands on light measurement technology in the automotive sector: the goniophotometer AMS 5000 combined with the DSP 200 photometer offers a perfect solution for testing modulated LEDs, which today ensure a driving experience under optimum lighting conditions. Read more »

FEATURED

Lumileds Introduces Brightest, Most Reliable RGB LED Module

Lumileds Introduces Brightest, Most Reliable RGB LED Module Leading in luminous intensity and reliability, Lumileds' new LUXEON MultiColor Module 0.5 W is the ideal building block for applications demanding consistent, brilliant color. Read more »

EDITORIAL

High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »

page_peel