Stokes shift refers to the difference in wavelength between the peaks of absorption and emission spectra of a substance, particularly in photoluminescence and electroluminescence. This phenomenon occurs due to the energy lost as the molecule relaxes from an excited state to a lower energy state before emitting light, resulting in the emitted light having a longer wavelength (lower energy) than the absorbed light. The Stokes shift is crucial for applications in various optoelectronic devices, influencing their efficiency and performance.
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