A Short Historical Past Of The LED PL Lamp
In 1907, H. J. Round, a researcher at Marconi laboratories, found out the electroluminescence phenomenon through the use of a crystal of carbon and silica and a primitive detector made from a semi-conductive metal. From that point to the modern LED PL lamp, there exists a century of enhancements and developments brought by scientists all over the world.
The Russian Oleg Vladimirovich Losev was the one that made the first LED around 1920. Everybody was excited about his breakthrough discovery, but since the light acquired by this method was too poor, not a single person seemed to find its utility. It was only in 1961 that Bob Biar and Gary Pittman learned that, by applying an electrical current to a gallium arsenide, they can get an infra-red light.
In the next year, Nick Holonyak made the very first red LED PL Lamp, as he was working at an electricity company. The color and the intensity of the light depended on the composition of the semi-conductor metal. The following step was to make the first yellow LED PL Lamp, and ever since that day till now, when there are so many kinds of colored LEDs, nearly every year meant a step forward.
Initially, LEDs were too costly to be used on a large scale, but in 1968, the Monsanto Corporation was the first company that started to mass produce LEDs. Later on, Monsanto was bought by a computer company and the LEDs were integrated in the alphanumeric computers. For a while, they were used just as indicators in the high-priced equipment, to be able to replace the incandescent lamps.
From those computer displays, which were able to show a single letter, to the animated displays of our days, and, in addition to walls of LED lamps displays, which can re-create complex images and movements, graduate colors and shades, the step was a huge one, made in a short period of time - around 30-40 years of research and evolution.
The very first LED PL Lamp that could be used to produce light was made by Shuji Nakamura in 1993 with an In-Ga-N alloy. In 2006 Nakamura was granted the Millenium Technology Prize for his achievement. Nakamura's LED had the color blue and, when mixed with the yellow one created by Dr. M. George Craford in 1971, a white light could be made, similar to the light given by the incandescent bulbs.
In 2008, the strongest LED to that day was created by a South-Korean manufacturer. The company was able to produce a record 900 lumen at 10 watts, 90 lumens / watt - almost the same as a 75 watt light bulb. Two years later on, a Japanese firm created a prototype of another powerful LED reaching 120 lumen / watt and, shortly after, another company declared that they made a prototype that can obtain 208 lm / watt.
This rapid evolution of almost 100 years permits us to suppose that, in a short time frame, we will all live in houses and work in offices that will use the LED PL lamp as main light emitter.
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