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The absorption of photons by a molecule leads to its excitation. An electronically excited molecule can lose its energy by emission of ultraviolet, visible, infrared radiation or by collision with the surrounding matter. Luminescence is thus the emission of photons from excited electronic energy levels of molecules. The energy difference between the initial and the final electronic states is emitted as fluorescence or phosphorescence (Lakowicz, 2006). Fluorescence is a spin-allowed radiative transition between two states of the same multiplicity (e.g., S1 → S0) whereas; phosphorescence is a spin-forbidden radiative transition between two states of different multiplicity (e.g., T1 → S0). The mechanisms by which electronically excited molecules relax to ground state are given by the Jablonski diagram as shown in Fig. 1. The absorption of a photon takes a molecule from ground state (singlet state, S0) to either first excited state (singlet state, S1) or second

Rotational Dynamics of Nonpolar and Dipolar Molecules in Polar and Binary Solvent Mixtures