Siemens, Osram discover deep-red LED material
The new oxynitric material emits light deeply in the red part of the spectrum. Compared to known materials, the wavelength of the new substance is 15 to 30nm longer, which means that the spectrum is shifted towards the "red" side. The discovery represents a substantial progress since the color gamut for LEDs still is rather limited. In order to convert the ultraviolet or blue light generated by available LEDs into white light, LED technologists place fluorescent materials into the LED chip. With these materials it is possible to cover a large portion of the spectrum. However, stable materials are lacking that efficiently emit deeply red light.
Since very small variations in the composition of such a material already substantially affect the LED properties, it is necessary to vary the composition in very many small steps. Thus, the research for new material combination generates huge numbers of variations which makes it difficult or impossible to manufacture and test them all manually. In order to handle these variations, Siemens researchers have developed a high-throughput experimentation technology (THE) that makes it possible to analyze many of these complex materials in a very short time. The Siemens HTC automates the planning of the experiments, the manufacturing of the probes, characterization, analysis and reporting.
The new material will expand Osram’s patent portfolio, the company said.
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