Monolithic integrated LED can realize color tuning

In an active LED display, three to four closely arranged LED devices can produce different colors, thus forming the different colors required for full chromatography. At present, an international research team has proved that using a single LED can achieve this result.

Scientists from Rihai University, West Chester University of Pennsylvania, Osaka University and Amsterdam University have successfully adjusted the color of GaN-based LED by controlling the radiation characteristics of Eu. Because of the emission of two different excited states of the same Eu3 + ion and the band-gap side emission of GaN with a center of about 430 nm, the team obtained all three primary colors through intentional co-doping and energy conversion processes. Researchers say the intensity ratio of these energy conversion can be controlled by choosing current injection conditions, such as injection current density.

Professor Brandon Mitchell said the experimental results were not limited to GaN: EU systems. “The current results open up a new field for single dopant tunable emission in semiconductors, which can be achieved by simple injection current tuning.” This study can provide a new idea for researchers who are working on more comfortable LED white light.

In addition, the research team said that the materials used in previous studies on color-tunable LEDs were not easily integrated with current LED technologies, and the current technologies they used could be well compatible with GaN-based LEDs currently used in commercial solid-state LED lighting.

The research results have been published in the International Journal of Nanophotonics, ACS Photonics.

The research results have been published in the International Journal of Nanophotonics, ACS Photonics.

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