Is there a kind of lamp in the case of high illumination, energy saving and instantaneous lighting? Yes, it does. It's called a light-emitting diode, or LED. LED is a semiconductor device that uses the semiconductor PN junction to convert electric energy into light energy. The PN junction is the core area of its luminescence, which is composed of p-type layer and N-type layer. The P-type layer provides holes and the N-type layer provides electrons

In this case, a hole in the P-layer is a phenomenon in which an electron is lost from a covalent bond in solid state physics, leaving a vacancy in the covalent bond. That is, some of the valence electrons in the covalent bond gain some energy from thermal motion, so they get rid of the constraints of the covalent bond and become free electrons, and at the same time they leave Spaces on the covalent bond, and we call these Spaces holes.

Under the action of an applied electric field, the holes and electrons are injected into the PN junction to compound, and the excess energy is released in the form of light, thus the PN junction can be observed to emit light. Leds, in general, rely on electrons and holes colliding to produce photons. Because of the high efficiency of converting electrical energy into light energy and the long service life of the lamp, LED lamps can provide high brightness and have the advantages of energy saving compared with metal halide lamps. Is it a little bit better?

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