When an electron jumps from the valence to the conduction band, it leaves behind a shadow called a “hole.” The electron in the conduction band and the hole in the valence band can bind together and form a composite object ( or pseudoparticle) known as an exciton. Photoluminescence in tungsten selenide is a result of such excitons.
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Unknown titlen. If excited by a small energy input, they get kicked into what is called the conduction band where they can actually be delocalised and contribute to the conduction by moving around. Excitons <span>When an electron jumps from the valence to the conduction band, it leaves behind a shadow called a “hole.” The electron in the conduction band and the hole in the valence band can bind together and form a composite object ( or pseudoparticle) known as an exciton. Photoluminescence in tungsten selenide is a result of such excitons. There can be two ways in which an exciton can form – when the spins of the component electron and hole are opposite to each other and when they are aligned in teh same direction. The fo Summary
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