The researchers developed a nano crystal material, can quickly convert blue light to white light

According to reports, the Saudi King Abdullah University of science and Technology (KAUST) researchers developed a nano crystal material, can quickly convert blue light to white light.

Although wireless network connectivity and Bluetooth technology has matured, but to shorten the length of the electromagnetic wave for information transmission can still get several benefits.

The so-called visible light communication (VLC) is the use of unregulated electromagnetic spectrum, may be more energy-efficient. VLC also provides a way to combine information transmission, lighting and display technology, for example, the use of dome light to provide Internet connection for notebook computers.

Many of these visible light communication (VLC) applications require white LED, generally by combining the emission of blue light diodes and light into red, green fluorescent powder to achieve. However, this conversion process is not fast enough to match the LED switch on and off.

Using the white light generated by the above approach to achieve the VLC rate is limited to 100 million bits per second, KAUST electrical engineering professor Boon Ooi said.

King Abdullah University of science and Technology (KAUST) photonics lab member Ooi, KAUST functional materials laboratory associate professor Osman Bakr and colleagues using nano crystal based converter, the converter can achieve high data rate.

The solution is simple and cost-effective based on the combination of conventional nitride phosphor, the research team to create a size of about 8 nm cesium bromide Pb nanocrystals. In the light of the blue laser, the nanocrystals emit green light, while the nitride emits red light, which combines to create a warm white light.

The researchers used a technique called femtosecond transient spectroscopy to characterize the optical properties of the nanocrystals. They were able to demonstrate that the optical process of cesium bromide nanocrystals requires about 7 ns. This means that they can adjust the light emission frequency to 491 MHz, which may be faster than the use of phosphor powder by 40 times, can achieve a data rate of 2 billion bits per second.

"The rapid response is partly due to the size of the crystals," says Bakr. "Spatial constraints make it possible for electrons to recombine with holes and emit photons".

Importantly, the quality of white light produced by the use of perovskite nanostructures is comparable to the current LED technology. (compile: LEDinside Nicole)

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