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Light-emitting diodes (LEDs) were an accidental discovery at first. At the beginning of the 20th century, it was discovered that when electricity was applied to the semiconductor Silicon Carbide (SiC) it produced a light. This light was too dim to be of any use so the research was never distributed. This could have been the end for the LED, but it wasn't content to die out.

Nearly 20 years later Russian and German scientists revisited the idea of light produced this way. The light was still of such poor luminance that the idea nearly died again. A report published in 1936, which helped to invent the term electroluminescence, revived the research for light from this source. The science of electroluminescence languished in obscurity for a while. It began to gain favor again in the 1950s when some British scientists started experimenting with it again. This led to the first infrared LED. From this technology came the first visible spectrum LED, in red, from Gallium Phosphide (GaP).

This was the start of the LED revolution. From that point each decade brought advances in the technology of light-emitting diodes. The use of different substrates brought brighter lights of different colors. The colors advanced from red to orange and on to pale green, then yellow and on to a brighter green. By the 1990s the use of Gallium Nitride helped usher in the era of blue LEDs. These blue lights became the basis for white light. The use of fluorescent phosphors helped change that blue light into high intensity white lights. Now LEDs can be found in almost every visible color of light.

This technology has led to additional uses for the LED as well. Due to their low light output they started out in indicator lights and display light applications only. The cost of materials was an issue at first and, therefore, they were used only in expensive laboratory and test equipment. They later began to be used in appliances, calculators and watches. The advent of additional colors increased their use in displays. They could be used in signs and digital display equipment.

The first LED flat panel television prototype was produced in 1977, by James P. Mitchell. This prototype was a red, monochromatic display. Later, in the 1990s, low-cost, efficient blue LEDs emerged moving this use along. Once a full spectrum of colors was realized in the late 1990s the flat panel LED television became a fully functional and popular option.

As the LED technology advanced and the luminescence increased, the uses for LEDs increased. LEDs began popping up in devices used to illuminate areas. Flashlights, landscape lighting, and other lighting sources became popular. Emergency lights began to use this technology. Traffic lights were replaced with LEDs. Interior lighting and headlights in vehicles became a common home for these lights, as well. As the cost of producing the lights decreased, and the availability of colors and brightness increased, the uses exploded.

From an accidental discovery to a common household name, the history of LEDs is a long one. The early discovery and limited uses of the light-emitting diode did not show much promise. Very few early researchers would probably have predicted the many, varied uses for this technology. The LED certainly earned its prominent spot in today's society.

~Ben Anton, 2007

Ben Anton lives in Portland, OR and writes for DLK.
We invite you to read more about white LED light bulbs and fixtures available at our quality wholesale LED products website.

Remedies for Plantar Warts

Plantar warts (warts that appear on the sole of the foot) are very common with children, young women, and young adults. However, you should know the virus that causes plantar warts is contagious and difficult for anyone to avoid. In fact, people that exercise and sweat heavily are likely to get plantar warts.

Plantars are flat because of the pressure caused by the amount of weight on the foot which more or less pushes the planters to spread out to bear the weight. In heavier people plantar warts may be seen more frequently due to the weight on the foot not being able to handle itself.

Instead of seeking for any plantar wart treatment after you get plantar wart, you can protect yourself from plantar wart by taking some preventive measures. The following preventive measures will keep you away from plantar warts. Try to avoid walking barefoot, if possible. You must change your socks daily.

The most comprehensive medical review you can find online was conducted by the American Family Physicians association and it states that various placebo methods had more then a 73% effective success rate. Before we discuss what methods they found that worked, let's discuss some of the less then effective methods currently being used to cure plantar warts.

Caused primarily by the HPV, or human papilloma virus, plantar warts are hard, scaly growths which occur on the base of the foot, usually in the areas that receive the most pressure such as the heel and the ball of the foot. While the causes and symptoms may vary, treatment for plantar warts is generally simple and usually effective.

A cure can also be achieved with the help of cryotherapy. In this treatment the plantar warts are froze with the help of cold solution like sodium nitride. The plantar warts turn black initially and fall off after few days.

Making sure what warts you have is through consulting a podiatrist or a dermatologist. A podiatrist is a foot doctor who has medical specialization in taking care of your foot, ankle and lower leg. The dermatologist is the skin expert who can take care of almost any skin disease.

Cause and symptoms:

Contrary to the old folk tale, you cannot get warts from touching a toad. A virus that enters the body through a break in the skin causes plantar warts. The virus develops in moist environments, warm, such as those created in your shoes when your feet perspire and the moisture is decoyed.

There are a number of home remedies available for naturally removing them and some of them require the use of ingredients that you have in your home all ready. Also using a natural method to remove the warts will not harm your skin and may not cause scarring. Finally, most home remedies are more comfortable to apply than the over the counter methods.

Treatment can come as over-the-counter medication meant for home use and self-medication. The most common types are the salicylic acid or silver nitrate-based medications. These plantar wart treatment medications are readily available at your local pharmacy.

Getting rid of plantar warts is really an extremely high priority for those individuals who suffer from them. Located as they are on the sole or beneath the toes, plantar warts are often extremely, extremely uncomfortable or even agonizing merely due to the constant pressure as the foot presses against the ground.

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