What is the condition for non radiative transition?
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nonradiative transitions that lead to the observation of molecular photoluminescence are typically illustrated by an energy level diagram called the Jablonski diagram. Figure 1 shows a Jablonski diagram that explains the mechanism of light emission is most organic and inorganic luminophores. The spin multiplicity of a given electronic state can be either a singlet (paired electrons) or a triplet (unpaired electrons). The ground electronic state is normally a singlet state and is designated as S0 in Figure 1. Excited electronic states are either singlet (S1, S2) or triplet (T1) states.
When the molecule absorbs light an electron is promoted within 10−14–10−15 s from the ground electronic state to an excited state that should possess the same spin multiplicity as the ground state. This excludes a triplet excited state as the final state of electronic absorption because the selection rules for electronic transitions dictate that the spin state should be maintained upon excitation. A plethora of non-radiative and radiative processes usually occur following the absorption of light en route to the observation of molecular luminescence. The following is a description of the different types of non-radiative and radiative processes.
When the molecule absorbs light an electron is promoted within 10−14–10−15 s from the ground electronic state to an excited state that should possess the same spin multiplicity as the ground state. This excludes a triplet excited state as the final state of electronic absorption because the selection rules for electronic transitions dictate that the spin state should be maintained upon excitation. A plethora of non-radiative and radiative processes usually occur following the absorption of light en route to the observation of molecular luminescence. The following is a description of the different types of non-radiative and radiative processes.
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