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The Emitting Principle and Structure of LED Down Light From:www.lgiled.com   Reporter:pamela   Date:2013/10/11 19:23:24   Tags:led-panel-light-safe

50 years ago, people have to understand the semiconductor material can produce light of the basic knowledge, the first commercial diode produced in 1960. LED is the English light emitting diode ( LED ) acronym , and its basic structure is an electroluminescent semiconductor materials, placed on a wire rack, then sealed with epoxy resin around , protect the internal core wire role , so the LED 's seismic performance. And led downlight is becoming more and more popular with the development of LED.

The core part of the light emitting diode is a p-type semiconductor and n- type semiconductor chip formed in the p -type semiconductor and an n -type semiconductor between a transition layer, called the junction. In some semiconductor materials, PN junction, the injection of minority carrier and majority carrier recombination, when will the excess energy released in the form of light, which converts electrical energy directly into light energy. PN junction reverse voltage, minority carrier injection is difficult, it is not light. This use of injection electroluminescent diodes called the principle of making light-emitting diodes, commonly known as LED. When it is in working condition (i.e., ends with the forward voltage), current flows from the anode to the cathode of LED, semiconductor crystal from the ultraviolet to the infrared light has a different color, different light intensity and current.

The terminal voltage of the PN junction to a certain barrier, the times when the base plus the forward bias voltage drop, P and N regions of the majority carriers spread to the other. Since electron mobility than hole mobility is much greater, so there will be a large number of electrons to the P diffusion region constituting the P region of the injection of minority carriers. These electron-hole recombination and the valence band, the obtained compound in the form of light energy in the release out.  In a short, this is the principle of light PN junction.

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