Where does the particle photon come from?

Answer 1

A photon may be both a particle and a wave (light). Photons are normally emitted when an electron loses energy either by bending its path or by falling from a higher orbital state to a lower orbital state.

Very high energy photons called gamma ray can also be formed from a positron and and electron merging.

Answer 2

Photons are elementary particles that make up light. They are a fundamental constituent of the universe and are emitted by all objects that have temperature. When an atom's electron drops to a lower energy level, it emits a photon with a specific energy corresponding to the difference in the energy levels.