A Brave New LED World
December 15, 2007 11:12 PM
comment(s) - last by
Scientist hope to put LEDs to work in brilliant new ways
light emitting diodes
, are a very old invention, with the first visible-light diode being invented in 1962. They consist of a junction of semiconducting material, such as a silicon or gallium compound. However, scientists today are looking to teach this old dog some new tricks, and putting LEDs
in a plethora of
The magic is in the material. While LEDs have been around for a long time, new and exotic materials are being used and older materials are being tweaked and reformulated to provide, a wider range of colors, brighter light, and higher efficiency.
The result is that LEDs may soon be permeating our lives in new ways. LEDs are already
invading the automobile headlight industry
and are in high demand due to their superior life and brightness.
Now one place scientists are looking to plant the LED is in the home. Tungsten lightbulbs have a very low 5% efficiency, compared to modern LEDs, which have around a healthy 40% efficiency. The result is power savings, increased brightness, and superior life. Obstacles standing in the way of this development are the still higher cost of LEDs and the fact that LEDs' white light has much more blue than sunlight or natural bulbs. However, these obstacles are fading as costs slowly drop and scientists develop better material blends to provide more yellow to the LED's emissions, making for a warm light that would be welcome in many a household.
Scientists are also looking to put tiny LEDs to a new use in the lab and eventually in commercial internet connections -- quantum cryptography. Tiny streams of photons in the system would pass from the LED to the a detector. Any interception of the beam (ie. snooping) would result in the signal being altered, as per the
. Such a system, when properly implemented would be in theory immune to any sort of malicious interception between the sender and the receiver.
Yet another use for the little lights has been proposed by scientists -- this one with promise of bringing new high-tech hope to impoverished regions. One of the world's largest problems is the lack of clean drinking water in third-world nations. Chemicals can be used to treat drinking water, but they are often expensive, toxic, and require a large amount of infrastructure. A frequently used alternative is high-energy UV light known as "deep UV", emitted from special UV bulbs. Passing a beam of this light through water kills most bacteria and destroys most viruses cleanly and simply. The issue with this system is bulbs constantly need to be replaced and are two bulky for small scale use.
Scientists feel the answer is deep UV LEDs. While they are still working on perfecting the materials, researchers, such as Dr Rachel Oliver, an LED researcher from the University of Cambridge, think it is just a matter of time before the optimal combination of materials is found.
"Deep-UV can't be made from the combination of materials we're used to, although I certainly think it's possible," Dr. Oliver stated.
Dr. Oliver is among many researchers striving to put LEDs to use in new and creative ways. She sees LEDs being commercially implemented in the aforementioned uses within 10 to 20 years.
For now these prospects still remaining cost prohibitive and are dependent on material breakthroughs, but the future sure looks bright for these little devices. And companies are looking to put LEDs today to a different and even more outlandish use --
every airport security officer's worst nightmare
Whatever their form, LEDs are transforming the way we light and see our world.
This article is over a month old, voting and posting comments is disabled
They need to make better regulation circuits for them.
12/16/2007 11:59:16 PM
I cannot stand that strobing affect that I see on a lot of taillight of newer cars. When I look around the road I see those horrible red LEDS strobing.
RE: They need to make better regulation circuits for them.
12/17/2007 12:16:15 AM
Unfortunately they seem to feel it is desirable in that given a particlar average current, achieving a higher peak momentary brightness seems more noticable to our eyes.
I agree they should think about using constant, low ripple current instead and it would be a trivial thing to do, or to modify your own car towads this end but you can't do much about someone else's car.
RE: They need to make better regulation circuits for them.
12/17/2007 4:30:02 PM
AFAIK, that's exactly what's going on. LEDs are strobed at current levels that are higher than they could be if they were turned on continuously. For example, an LED that could be run with 0.1A continuous is run at 0.5A at 20% duty cycle (20% on time, 80% off time). The average power dissipated by the LED is the same, but the perceived brightness is higher.
"A politician stumbles over himself... Then they pick it out. They edit it. He runs the clip, and then he makes a funny face, and the whole audience has a Pavlovian response." -- Joe Scarborough on John Stewart over Jim Cramer
MIT Student Arrested at Gunpoint in Airport for Electronics Shirt
September 24, 2007, 4:55 AM
Driving LED Emoticon
July 26, 2007, 2:05 PM
World's First 16.7M Color Flexible OLED Display
May 25, 2007, 1:15 PM
Philips Demonstrates LED Fabric Technology
January 20, 2007, 1:40 AM
LED Headlights Find Their Way to High-End Automobiles
October 26, 2006, 3:00 PM
Retiree Sues Apple For $7,500 for Wiping Honeymoon Photos From His iPhone
November 30, 2015, 10:23 AM
iPhone 7 May Pack 3-4 GB Memory, More Storage; 4-Inch Comeback is Rumored
November 20, 2015, 10:12 PM
OnePlus One, OnePlus 2 Will Receive Android Marshmallow in Q1 2016
November 16, 2015, 9:58 AM
Lenovo Whoa: Motorola Droid MAXX 2 and Turbo 2 Break Cover in Leaks
October 26, 2015, 3:12 PM
Leak: Apple Preps for First Real Android App Foray With New Apple Music App
October 24, 2015, 1:59 PM
Pepsi Smartphone? Empty Calories Coming Soon to the Midrange
October 12, 2015, 11:41 PM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2016 DailyTech LLC. -
Terms, Conditions & Privacy Information