Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

So this "electron-hole pair" is one hole in the valence band and one electron in the conduction band. And this "lost of electron-hole pair" is when they actually pair up and combine physically? Weird naming. I always thought that the moment they recombined, thats one pair made but this "pair" meant pair of unpaired (+) and (-) carriers.

Semiconductors are characterized by two types of mobile carriers, electrons in the conduction band and holes in the valence band. Both bands are separated by the energy gap. This energy gap is about 1.1 eV in silicon.

There is a continuous transition of electrons between the two bands. When an electron falls from the conduction band into the valence band, into a hole, a recombination process occurs and an electron hole pair disappears. The energy of recombination will be emerged as a photon of light.

Inversely, when a valence electron is given an energy equal or greater than the energy gap it will be transferred to the conduction band and an electron hole pair will be generated.

Please explain Briefly.

But energy produced during recombination produces new electron hole pair.

When hole is replace by electron the electron hole paires reduced.