标签：LED light

LED light evolutionary history

In 1907, Henry Joseph Round for the first time on a piece of silicon carbide was observed electroluminescence phenomenon. Because the light is too dim a yellow color, and not suitable for practical application; more difficulty lies in silicon carbide and electroluminescence can not adapt to the good, so the research has been abandoned.
In twenty times Bernhard Gudden and Robert Wichard in Germany used advanced from zinc sulfide and copper refining yellow phosphorus emission. Once again as the light emitting dim and stop.

led light
In 1936, George Destiau published a zinc sulfide powder emission light report. With the current application and widely recognized, culminating in the “El” this term. In twentieth Century 50, British scientist’s photoluminescence experiments using semiconductor GaAs invented the first modern led in electric, and published in the 60’s. It is said that in early trials, LED needs to be placed in liquid nitrogen, and need operation and further to efficiently work at room temperature. The first commercial LED can not only emit invisible infrared light, but quickly applied to induction and photoelectric fields. At the end of the 60’s, the use of phosphate invented the first visible red light LED on GaAs substrate. Gap changes make LED more efficient, the red light is brighter, and even produce orange light.
To 70 time metaphase, gap is used as the light source, then a pale green. LED adopts a double-layer gap chip (one red and the other one is green), which can emit yellow light. At this time, Russian scientists use emery manufacturing out of the yellow light LED. Although it is not efficient as European’ LED. But in the late 70’s, it can emit green light.
The early 80’s mid of GaAs aluminium phosphide make the birth of the first generation of high brightness LED, first red, then yellow, and then green. By the early nineteen nineties, using indium aluminum phosphate produces red, orange, yellow and green LED. The first historic Blu-ray LED also appeared in the early 90’s, the obstacles of semiconductor light source abrasives come early again. According to the technical standard current to measure, yellow LED with Russia source.
90 time metaphase, the GaN LED super bright, then create a green and blue nitrogen gallium indium Led can produce high strength. Super bright blue chip is the core of white LED, with fluorescent phosphorus in the light-emitting chip, and then the fluorescent phosphorus by absorption from the chip on the blue light into white light. Is it to use this technology to produce any visible color light? Today in the LED market let us see produced new colors, such as light green and pink. Scientific thinking readers now may be aware of the LED development experienced a long and tortuous historical process. In fact, the recent development of LED not only can emit ultraviolet light, but also can emit pure and true “black” uv. Then how far the LED development history does could last, there can make nothing of it. Perhaps one day will be able to develop to X ray LED. LED can only be applied early in the indicating lamp, calculator display early and digital watch. And now began to appear in the super bright field. It will be in the next period of time to continue.

Using LED light, aircraft can also access to phone call

LED lighting can not only enlightening, but also surf the Internet! On the air flight, using LED Internet, phone, will not endanger the safety of aircraft. October 18, Guangdong Province, the LED theme park “was officially opened in Guangdong Science Center Park, which is the first domestic LED lights theme park, vice governor of Guangdong Province, Chen Yin attended the launching ceremony and delivered a speech.

Using LED light, aircraft can also access to phone call

What is LED? and what is the advantage of LED? what does Guangdong LED industry doing? The purpose of the theme park is to answer these three questions.

At present, on the flight, we must turn off the phone, and also can not access to Internet. But if we install a LED light on top of security in an airplane seat, and  also install the LED pulse signal receiving device on a computer or mobile phone,  we can surf the Internet, play cell phones, and it will not interfere with aircraft radar signal, also the safety of an aircraft unaffected.

The message says, the Civil Aviation Administration of China are planning phases in the civil aviation satellite communication device. ” Installation of satellite communication equipment, aircraft can through the LED light optical communication link network.

In this exhibit, the most popular is the ” LED hologram ” and rgb led mood light, people, standing in front of the screen, turning a large cube, can be appeared small waist on the screen , Guangdong Science Center, a holographic image of city square.

China Civil Aviation Bureau asked the airlines in the first stage in 2013, according to the company’s fleet of the actual situation, to achieve 20% aircraft with satellite communication ability; in 2014 January, all the introduction of the new aircraft should have the ability of satellite communication; at the end of 2014, the total fleet of 45% aircraft should have the ability of satellite communication; at the end of 2015, the total fleet of 70% aircraft should have the ability of satellite communication.

According to the Chinese Civil Aviation Bureau statistics, at present our country already had a few on international routes and in the southwest plateau operation of aircraft equipped with LED light and data link communication, while the vast majority of domestic routes in the operation of the aircraft, which is equipped with data link communication system and communication, China aircraft only high frequency communication.

How to calculate the transparency and threshold currents of laser, and the comparisons with LED light. (1)

A laser diode is a laser where the active region is a semiconductor. We use this device to emit photons by applying the injected electric current to it to achieve population inverse (N2>N1) and the light with a certain range of frequency to stimulate it. As we all know, only under this circumstance, the laser diode can work as a laser. Otherwise, it will work as a LED light (only spontaneous emission like figure 1).

 How to calculate the transparency and threshold currents of laser, and the comparisons with LED light. (1)

Figure 1: spontaneous emission

When the atom spontaneously decay from a higher level to a lower level without any other stimulate, it can be defined as spontaneous emission. Spontaneous emission is the main emission pattern of LED light. Thus, if you compare a LED light (such as led streetlight, LED light) with the laser, the condensation of light of the former one is much less than the later one. That means the full width half maximum (FWHM) of the optical spectrum of LED light is larger than that of laser.

Here, we define Np as the photon density in the cavity and N as the carrier density in the cavity. The change of photon density with time can be represented as: dNp/dt; similarly, the change of electron density with time can be represented as: dN/dt; In the following steps, we will discuss the critical factor that determine dNp/dt and dN/dt.

A semiconductor has many energy levels. The band gap (Ec-Ev) of a certain semiconductor only depends on the material. Generally, an electron will stay in a lower energy level. It can convert to a higher level by absorbing energy, such as thermal energy, photons etc. It also can convert from a higher level to a lower level by emission energy (thermal or photons). There are three different conversions between electrons and photons in the cavity: spontaneous emission, stimulated emission and absorption. In the first two procedures, EHPs recombine to generate photons. While in the last procedure, a photon is absorbed to generate an EHP.

Kobe, you are still the best one, because you use LED light

 

Finally, NBA 2011-2012 starts again. But LA Lakers lost the first 2 games. But now, for the 3rd game, Kobe Byrant attacks more and more, helps LA Lakes won the 3rd game in thise season, beat Jazz by 96:71.

Some people think Kobe is not as good as he used to be, but I think he’s still the best SG of NBA. No matter how the LA Lakers lose the games, no matter why his wife want to divorce, he buy a new car–Lamborghini Aventador LP700, which is supplied with LED Light.


 Kobe, you are still the best one, because you use LED light

 

The LED Light is better lumen output, longer lifespan, lower power consumption. In the coming 2012, if you don’t use any LED products, maybe it means you are not so fashion and Environmental protection minded.

Don’t know any of the LED Light products?LED Light include LED Replacement Lamps,LED Down Lights,LED Tubes,LED Panel Lights,LED High Bay Lights,LED Street Lights,LED Flood Lights,LED Tunnel Lights,LED Explosion Proof Lights etc.

About LED Light you shoud know Eneltec-LED.Eneltec supply different models of LED Spot Lights, LED Bulbs, LED Tubes, T5 Adapters, etc. Eneltec’s core technology is ultra low loss optic design, LED heat sink system design and high efficient drive circuit design.

Eneltec Group provides top quality LED Light .Quality , Service and Time Efficient ! That’s what they seek for LED Light and they are doing LED Light!