The Conception of SMD LED
SMD LED means SMT light emitting diode which helps to improve the production efficiency and it can be used in various fields. SMD LED is a kind of solid state of the semiconductor device which can directly convert electric to light. SMD is the abbreviation of Surface Mounted Devices which means the Surface Mount Devices. SMD is one of the components of SMT (Surface Mount Technology). The 3528 SMD and 5050 SMD are two common types of SMD. SMD LED is made up of FPC board, LED lamp and high quality silicone casing. It has luminous color and waterproof performance which are convenient and safe supplied by low voltage dc power. Even using in the outdoor it has the advantages of resistance to UV aging, to become yellow and to high temperature. The products are widely used in the field of the building clearance lighting, places of entertainment decorative lighting, advertisement decoration lighting, etc. The voltage of SMD LED is 1.9-3.2V, and the voltage of the red SMD LED and the yellow SMD LED are lowest. The heart of LED is a semiconductor chip, one end of chip attached to a support which is negative, and the other end connected to the power of positive---that structure makes the entire semiconductor chip encapsulated up by epoxy resin.
The Common Types of SMD LED
3528 SMD and 5050 SMD LED
are the two table stick types of light emitting diode (LED). 3528 in stand of appearance size which is 35 * 28 and 5050 means that its appearance size is 50 * 50. The luminous flux of 3528 SMD
is about 3-9 lm and the luminous flux 5050 SMD is about 11-21 lm.
The Working Principle of SMD LED
Semiconductor chip consists of two parts. One part of it is a P-type semiconductor which is dominant in the whole structure, and the other end is n-type semiconductor which is primarily electronic. But these two kinds of semiconductor link, they formed a p-n junction between them. When an electric current passes through the chip on the conductors, electronic will be pushed to the P area, in the P area electronic compound with hole, and then they will be issued in the in the form of photon energy which is the principle of LED lighting. And the wavelength of light, that is the color of the light, is determined by the formation of p-n junction material.
Showing posts with label 5050 SMD LED. Show all posts
Showing posts with label 5050 SMD LED. Show all posts
Monday, January 7, 2013
Thursday, December 27, 2012
Introduction of SMD LED
Notes for Welding SMD LED
First, clean do not use unknown chemical liquid to clean SMD LED, because unknown chemical liquids may damage SMD LED. When it is necessary to wash it, immerse the 5050 SMD LED in alcohol for less than 1 minute in the normal room temperature, and naturally dried it for 15 minutes, and then you can begin to use it. Second, moisture proof packaging is used to avoid the moisture of product during transportation and storage, SMD LED is packaged with moisture-proof aluminum packaging bags, and there are desiccant and humidity card in the bags, the desiccant mainly control the humidity of packaging bag and humidity card monitors SMD packing humidity. Third, the manual welding process, the soldering iron must be less than 25W, the temperature must be kept below 315 °C and the welding time cannot be more than 2 seconds. Furthermore, soldering iron cannot come into contact with the epoxy part. When finishing the welding, it cannot be packaged until its temperature is below 40 °C after it cool down.
The Features of SMD LED
The emitting principle belongs to a cold light emitting rather than lighting by heating or discharge, so the component life is about 50 to 100 times than the incandescent bulbs, it is about 100,000 hours. It needs no warm lights and the lit response speed is faster than the general electric light (approximately 3 to 400ns), the same with LED diode. Electro-optical conversion efficiency is high and the power consumption is small, it saves about 1/3 to 1/20 of the energy consumption than the ordinary bulb. In addition, it has excellent shock resistance, high reliability and low cost of the system operation. Its size is small and thin, and its weight is light, without the limitation on the shape, so it is easily made into all kinds of applications.
The Purpose of SMD LED Package
SME LED must be packaged, because the package can protect grain and lines, to avoid disconnection, moisture or damaging the grain. It can Increase the light output of the grain, and reduce the proportion of the light of total reflection of the grain surface. It may design the specific light emission angle and brightness analysis. Furthermore, it can fine-tune the color of LED. The package makes it easy to be hold and installed. Last but not the least, it can meet the photoelectric of the various applications and the size requirements. Therefore, we should pay more attention to the package of SMD LED, for it plays an extremely important role in protecting and optimizing the light.
This article come from:http://cell.battery-products.com/smd-led/the-introduction-of-smd-led.htm
First, clean do not use unknown chemical liquid to clean SMD LED, because unknown chemical liquids may damage SMD LED. When it is necessary to wash it, immerse the 5050 SMD LED in alcohol for less than 1 minute in the normal room temperature, and naturally dried it for 15 minutes, and then you can begin to use it. Second, moisture proof packaging is used to avoid the moisture of product during transportation and storage, SMD LED is packaged with moisture-proof aluminum packaging bags, and there are desiccant and humidity card in the bags, the desiccant mainly control the humidity of packaging bag and humidity card monitors SMD packing humidity. Third, the manual welding process, the soldering iron must be less than 25W, the temperature must be kept below 315 °C and the welding time cannot be more than 2 seconds. Furthermore, soldering iron cannot come into contact with the epoxy part. When finishing the welding, it cannot be packaged until its temperature is below 40 °C after it cool down.
The Features of SMD LED
The emitting principle belongs to a cold light emitting rather than lighting by heating or discharge, so the component life is about 50 to 100 times than the incandescent bulbs, it is about 100,000 hours. It needs no warm lights and the lit response speed is faster than the general electric light (approximately 3 to 400ns), the same with LED diode. Electro-optical conversion efficiency is high and the power consumption is small, it saves about 1/3 to 1/20 of the energy consumption than the ordinary bulb. In addition, it has excellent shock resistance, high reliability and low cost of the system operation. Its size is small and thin, and its weight is light, without the limitation on the shape, so it is easily made into all kinds of applications.
The Purpose of SMD LED Package
SME LED must be packaged, because the package can protect grain and lines, to avoid disconnection, moisture or damaging the grain. It can Increase the light output of the grain, and reduce the proportion of the light of total reflection of the grain surface. It may design the specific light emission angle and brightness analysis. Furthermore, it can fine-tune the color of LED. The package makes it easy to be hold and installed. Last but not the least, it can meet the photoelectric of the various applications and the size requirements. Therefore, we should pay more attention to the package of SMD LED, for it plays an extremely important role in protecting and optimizing the light.
This article come from:http://cell.battery-products.com/smd-led/the-introduction-of-smd-led.htm
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