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The history of LED lights
Jun 07, 2018

The first commercial diode was made in 1960. The core of a light-emitting diode is a chip composed of p-type semiconductor and n-type semiconductor. There is a transition layer between p-type semiconductor and n-type semiconductor, called p-n junction. In the PN junction of some semiconductor materials, the injection of a small number of carrier flow

When combined with most carriers, the extra energy is released in the form of light, which converts electrical energy directly into light energy. PN junction with reverse voltage, a few carriers are difficult to inject, so no light. This kind of diode which makes use of the principle of injection product electroluminescence is called light-emitting diode, commonly known as LED. (that is, when it is in a state of positive work plus forward voltage) on both ends, when the current is flowing from the LED anode to cathode, semiconductor crystal gives different colors of light from ultraviolet to infrared, the strength of the light associated with current. High-efficiency and low-light fading high-power LED has been widely used in many lighting fields, such as street lamps, industrial and mining lamps, tunnel lamps, spotlights and fluorescent lamps, and has been well received by the industry.

1. Independent encapsulation using solid-state semiconductor device chip high luminous efficiency, the brightness of the 1 w can achieve the effect of common fluorescent lamp 3 w, 60% of the electricity saving, good light failure, high temperature resistant PC plastic material.

2. Low vf value (3.1v-3.5v) can reduce dissipation power, reduce heat generation, and extend the working time of LED.

3. The unique epoxy resin packaging process is adopted to generate energy in the form of electron, and the lumen values of normal white and warm white can be similar.

4. The lens is handled in a special way to ensure that it will not fall off.

5. Use

LED lights,LED lights.LED lights decoration,LED spotlights, high power 60W 80W 120W 160W 180W LED decorative lights LED lights LED street lamps LED industrial lights LED lighting LED stage lights.

application

Initially LED is used as the indicator light instrument and then all kinds of light color of LED traffic light and display screen has been widely applied in large area, produced good economic and social benefits. Take a 12-inch red traffic light, for example, in the United States

To use the long life, low light efficiency of the 140 - watt incandescent lamp as the light source,

It produces 2000 lumens of white light. After passing through the red filter, the light is lost 90%, leaving only 200 lumens of red light. In the new design, Lumileds USES 18 red LED lights that consume 14 watts of power, including circuit losses, to produce the same light effect.

Automobile signal lamp is also an important field of LED light source application. In 1987, our country began to install high brake lights in the car, because the LED response speed (nanoseconds), could help make following vehicle drivers know driving conditions, reduce automobile rear-end collision accident.

In addition, LED lights have been used in outdoor red, green and blue full-color display screens, keyring micro-torches and other fields.

type

LED lighting can be divided into indoor lighting and outdoor lighting. The common types of LED lighting lamps in the market mainly include the following types of products: High power LED module module street light, LED lamp, LED lamp cup, LED lamp holder, LED lamp, LED lamp, LED lamp, LED lamps, LED lamp, LED soft light, LED lamp, LED bulbs, LED lamp bead, LED the wick, LED chip, LED tube light, LED candle light, LED star lights, LED sensor lights, small power LED lamp, high power LED lights, high-power LED bulbs, LED meteor shower lights, LED air vitamin purification lights, LED voice control light, LED flat light, LED touch light, LED semiconductor lighting , high power LED ceiling lamp, LED lamp, LED tube, LED explosion-proof anticorrosive dust-proof lamp, LED solid-state free maintenance explosion-proof lamp, LED fluorescent lamp lens, the LED explosion-proof project-light lamp, high power LED lamp, LED fluorescent lamp, LED TV, LED backlight, LED lamp, LED light, LED light flashlight, LED project-light lamp, LED dared light, LED corn light, LED buried lights, LED cabinet light, LED stage lights, LED mall light, lathe dedicated LED lamp, LED lamp, LED mining wiring locomotive lamp, LED explosion-proof lamps, LE D tunnel lights and other LED classification products.

Research and development problems

1. High demand for heat dissipation

In the case of poor heat dissipation, LED life will be greatly reduced.

2. High starting cost

LED prices are high, although long-term costs may be low, but high starting costs reduce LED penetration.

3. Performance needs to be strengthened

Fluorescent lamp can not completely replace incandescent bulbs for fluorescent lamp is one of the important reason why play poor color (incandescent lamp is continuous and smooth spectrum, color is close to 100, the light also have a healthy eye characteristics; Other artificial light sources are mostly emission spectrum, which is difficult to replace incandescent lamp and sunshine. The performance of low - and medium-level leds is even lower than that of fluorescents.

4. Efficiency still needs to be strengthened

LED is very efficient at low luminosity, but when the power LED lamp is improved, the efficiency is not so good, especially for medium and low order high power LED lighting, the efficiency is not as good as T5 lamp tube.

5. Large production error

The same batch of LED production, each LED between the characteristics (brightness, color, bias... There are also considerable differences that must be split up at considerable cost.

6. Development of design philosophy

There are two design concepts of LED lamps: one is the scene lighting proposed by philips in 2008. The other is the emotional lighting proposed by cassio in 2009.

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