In PL various spectroscopic terms are used to shows the transition between the ground state to excited state, how these terms arises ?

04 December 2020 0 886 Report

In PL various types of spectroscopic terms are used to shows the transition from ground state to excited state at a particular wavelength. e.g for Sm3+ doped in CaSnO3 a spectroscopic term is used 5D0 to 7F2 .I am not able to understand how this particular spectroscopic term is used for the emission spectra?

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