Featured Research

from universities, journals, and other organizations

Vacuum ultraviolet lamp of the future created

Date:
April 22, 2014
Source:
American Institute of Physics (AIP)
Summary:
Scientists have developed a solid-state lamp that emits high-energy ultraviolet (UV) light at the shortest wavelengths ever recorded for such a device, from 140 to 220 nanometers. This is within the range of vacuum-UV light -- so named because while light of that energy can propagate in a vacuum, it is quickly absorbed by oxygen in the air.

The VUV lamp, which has a potential to be powerful tool for the surface treatment and optical cleaning, was demonstrated.
Credit: S. ONO/Nagoya Institute of Technology (NITech)

A team of researchers in Japan has developed a solid-state lamp that emits high-energy ultraviolet (UV) light at the shortest wavelengths ever recorded for such a device, from 140 to 220 nanometers. This is within the range of vacuum-UV light -- so named because while light of that energy can propagate in a vacuum, it is quickly absorbed by oxygen in the air.

This fact makes vacuum UV light extremely useful for industrial applications from sterilizing medical devices to cleaning semiconductor substrates because when it strikes oxygen-containing molecules on a surface, it generates highly reactive oxygen radicals, which can completely destroy any microbes contaminating that surface.

Existing commercial vacuum UV lamps are bulky and expensive, however. They also use a lot of power, run hot, have short lifetimes and contain toxic gasses that can pollute the environment and harm people. The new lamp avoids those issues because it was fabricated with a solid-state phosphor made from a thin film of KMgF3, which is easy to make, avoids the use of toxic gasses and does not require expensive rare earth elements.

In AIP Publishing's journal APL-Materials, the Japanese team describes how this solid-state phosphor promises to make future, low-power vacuum UV lamps that will be more flexible in design as well as being smaller, longer lasting and relatively heat-free -- all traits that are typical advantages of solid state lighting in general.

"Our lamp is a promising light source in terms of lifetime, size, heat conduction and stability," said Shingo Ono of the Nagoya Institute of Technology in Japan, who led the research. "[It] has the potential to be an excellent alternate light source to low-pressure mercury lamps, excimer lamps and deuterium lamps."

In addition to Ono and his colleagues at Nagoya Institute of Technology, the team was composed of researchers from Universiti Teknologi Malaysia; the Tokuyama Corporation in Tokyo; Tohoku University in Sendai, Japan; and the Kyushu Institute of Technology in Kitakyushu, Japan.

One of the hurdles they faced was to safely fabricate the phosphor using a compound containing fluoride, which is itself a toxic, corrosive and potentially dangerous chemical to handle. One way would have been to use an inflow of gaseous fluoride to coat the surface of the KMgF3 thin film, but instead the team discovered a safer route to fabricating it with pulsed laser deposition -- a way of layering thin films of chemicals onto surfaces through irradiation with a focused laser beam.


Story Source:

The above story is based on materials provided by American Institute of Physics (AIP). Note: Materials may be edited for content and length.


Journal Reference:

  1. Masahiro Yanagihara, Zamri Yusop, Masaki Tanemura, Shingo Ono, Tomohito Nagami, Kentaro Fukuda, Toshihisa Suyama, Yuui Yokota, Takayuki Yanagida and Akira Yoshikawa. Vacuum ultraviolet field emission lamp utilizing KMgF3 thin film phosphor. APL-Materials, April 22, 2014 DOI: 10.1063/1.4871915

Cite This Page:

American Institute of Physics (AIP). "Vacuum ultraviolet lamp of the future created." ScienceDaily. ScienceDaily, 22 April 2014. <www.sciencedaily.com/releases/2014/04/140422113237.htm>.
American Institute of Physics (AIP). (2014, April 22). Vacuum ultraviolet lamp of the future created. ScienceDaily. Retrieved August 22, 2014 from www.sciencedaily.com/releases/2014/04/140422113237.htm
American Institute of Physics (AIP). "Vacuum ultraviolet lamp of the future created." ScienceDaily. www.sciencedaily.com/releases/2014/04/140422113237.htm (accessed August 22, 2014).

Share This




More Matter & Energy News

Friday, August 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Former TSA X-Ray Scanners Easily Tricked To Miss Weapons

Former TSA X-Ray Scanners Easily Tricked To Miss Weapons

Newsy (Aug. 21, 2014) Researchers found the scanners could be duped simply by placing a weapon off to the side of the body or encasing it under a plastic shield. Video provided by Newsy
Powered by NewsLook.com
Flower Power! Dandelions Make Car Tires?

Flower Power! Dandelions Make Car Tires?

Reuters - Business Video Online (Aug. 20, 2014) Forget rolling on rubber, could car drivers soon be traveling on tires made from dandelions? Teams of scientists are racing to breed a type of the yellow flower whose taproot has a milky fluid with tire-grade rubber particles in it. As Joanna Partridge reports, global tire makers are investing millions in research into a new tire source. Video provided by Reuters
Powered by NewsLook.com
Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins