Scientists Collaborate To Develop New Technologies To Adjust LED Color

- May 07, 2019-

According to reports, scientists from Lehigh University, West Chester University, Osaka University, and the University of Amsterdam have developed an adjustment. New technology for LED color.


Volkmar Dierolf, a well-known expert and chairman of the School of Physics at Lehigh University, participated in the research and development of the project. The new technology is said to pave the way for monolithic integration, enabling simple color grading of the bulb. With this technology, commercial LEDs will be able to adjust between bright white to more comfortable warm tones.


The research team described the possibility of color adjustment of GaN-based LEDs by simply changing the time sequence in which the operating current is supplied to the device. It is worth noting that this technology is compatible with LEDs that are the core of commercial solid-state LED lighting.


In today's active LED displays, 3-4 closely spaced individual LEDs produce different colors and create the different basic colors needed to produce a full color spectrum.


Dierolf said that a single LED can achieve color grading, and they found that they can get red, green and blue light from a single GaN LED structure, which is doped with a single type of rare earth ion (Eu). In other words, the research team achieved color tunability in a single GaN-based LED species by manipulating the emission characteristics of the atomic dopant.


Mitchell pointed out that this study (with multiple excitation states using the same dopant as the main target) is not limited to GaN: germanium systems, and its application is more common. The results of the study open up a whole new field of single dopant doping in semiconductors that can be achieved with simple injection current tuning.


Dierolf believes that those who want to get more comfortable warm white light from LEDs will benefit from this technology. And, given the technology's ability to apply higher pixel densities, it also helps develop Micro LED displays.


It is reported that this study was published in the journal ACS Photonics, entitled "Colour-Tunablility in GaN LEDs Based on Atomic Emission Manipulation under". Current Injection).