LED lights

In what way does an LED emit light?

Take a fluorescent tube or neon sign for instance. Light from a Light Emitting Diode (LED) can be similarly created from inside an LED crystal. The electrons in the atom become energized and when they calm back down, each individual atom emits a wave of light. On the other hand, the activity of the electrons in an LED does not completely act in the same manner as does the gas molecules in a fluorescent tube or neon sign.

The gas molecules are not glued together with individual atoms. In its place, the electrons take up an adjoining “sea of charge,” and they continuously move about all the atoms in the substance.

While they act as they do, they maintain a specific level of energy just like when they are moving about the atoms. It is almost as if each electron in an LED crystal orbits among all the atoms of the substance as a group.                                                           Adding to that, the electron always hovers so-to-speak at a height above each individual atom it passes by.

Keep in mind that all substances contain electrons. The battery does not produce the electrons we are talking about here, they instead happen naturally in the wires, crystals and so on... The electrons remain in the LED all the time, even when the battery is disconnected. Please do not make my original mistake by thinking that electrons are inserted in to the LED by the power source.                                                               In fact, the electrons are already in the material and the source of power merely pushes them to flow.

The ’high floating and low floating’ crystals are normally dubbed “n-type and p-type” respectively. N-type crystals’ electrons float around the upper energy level of an unfilled outer atomic orbital. The electrons continue to travel at this level during electric currents. Conversely, in p-type crystals the mobile electrons naturally lie at a deeper orbital level than n-type crystals. When the two crystals are connected properly along a circuit with a battery, the battery produces a current for the entire circuit. It pulls electrons out of the rear of the p-type crystal and into the wire. Simultaneously, it pushes electrons to the far end of the n-type crystal. The electrons already present in the n-type crystal then are forced to move across, decrease in energy level, emit light, and go right back to the p-type crystal.
                                                                                                                            Here is another way to see LED’s. In a neon light-up sign the electrons around each neon atom get juiced up with energy as incoming high-speed electrons strike them. In an LED the battery psyches up the electrons directly. In a neon sign, each individual atom emits light when electrons fall back to their original energy state. In an LED, the entire crystal emits light as the electrons’ energy becomes sapped and sinks to a lower level. Henceforth, an LED is similar to a huge single neon atom! A LED/atom is so big that we can easily connect its electron cloud directly to a battery that has wires. It is so gigantic that we can even build differing characteristics, which can change the color of its fluorescence.

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