Titanium dioxide increases the emission intensity of laser LEDs. Free Technical Library News

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Titanium Dioxide Increases the Emission Intensity of Laser LEDs

30.01.2023

Titanium oxides significantly increase the efficiency and photoluminescence of LEDs. The dominance of white LEDs as the main source of light may soon end with the emergence of a new alternative.

The photonic crystal or nanoantenna, a two-dimensional structure with a periodic arrangement of nanosized particles, is being developed as an advanced optical control technology. Exposure of light to a combination of a nanoantenna with a phosphor plate produces a harmonious combination of blue and yellow light.

White LEDs have already received an improvement in the form of white laser diodes (LD), which consist of yellow phosphors and blue laser diodes. Blue LDs are highly directional, while yellow phosphors radiate in all directions, resulting in unwanted color mixing.

To solve this problem, the researchers developed phosphor plates in combination with nanoantennas using aluminum metal, which allows increasing photoluminescence. Aluminum nanoparticles effectively scatter light and improve its intensity and direction. However, aluminum also absorbs light, reducing power output. This is a major bottleneck, especially for tasks that require high light intensity.

A team of researchers from Kyoto University has achieved a tenfold increase in direct photoluminescence by replacing aluminum with titanium dioxide.

"Titanium dioxide turned out to be the best choice due to its high refractive index and absorption in low light," said study lead author Shunsuke Murai.

Although the light scattering intensity of titanium oxide initially appeared to be less than that of aluminum metal, the team used computer simulations to develop an optimal nanoantenna design.

“The new nanoantenna phosphors are advantageous for very bright but energy-efficient solid-state lighting because they can suppress the temperature rise during irradiation,” explains Murai. “In the process of finding optimal sizes, we were surprised to find that the thinnest phosphors produced the brightest photoluminescence, demonstrating how increase the intensity of both direct radiation and the total power".

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Cocoa - protection against hypertension 09.10.2007

The Kuna Indians live on islands off the Caribbean coast of Panama. Unlike residents of developed countries, the representatives of the tribe rarely have hypertension, their blood pressure does not increase with age, and the frequency of diseases associated with high blood pressure - heart attack, diabetes, stroke - is lowered. But those Indians who have moved to the mainland are losing the islanders' protection against hypertension.

What's the matter? As ethnographers have discovered, the Kuna Indians drink several cups of cocoa daily, and they make their own from the seeds of the cocoa tree. At the same time, flavonoids remain in the ground seeds - compounds that make the drink bitter. Flavonoids are usually removed from regular cocoa and chocolate.

Meanwhile, they protect the heart and blood vessels. Having moved to the mainland, in more civilized conditions, the Indians stop preparing their cocoa and acquire diseases characteristic of civilization. Some global chocolate manufacturers are already starting to produce chocolate bars and cocoa powder with flavonoids.

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