Phosphoreszenzspektren

Phosphoreszenzspektren are plots that show the intensity of light emitted by a substance undergoing phosphorescence as a function of wavelength. Phosphorescence is a type of luminescence where a substance absorbs energy and then re-emits it as light over a longer period, often minutes, hours, or even days, after the excitation source is removed. This prolonged emission is due to a transition from a metastable triplet state to a singlet ground state, which is spin-forbidden and therefore slow.

The spectrum of this emitted light reveals information about the electronic structure of the phosphorescent material. Peaks in the spectrum correspond to specific energy differences between electronic states within the molecule or atom. Analyzing the wavelengths and intensities of these peaks allows researchers to identify the substance and understand its photophysical properties. Unlike fluorescence, which typically occurs on nanosecond timescales and involves transitions between singlet states, phosphorescence emission is red-shifted compared to the absorption spectrum and generally occurs at longer wavelengths. The broadness of the peaks in a phosphorescence spectrum can be influenced by vibrational interactions and the surrounding environment. These spectra are crucial in fields like materials science, analytical chemistry, and biological imaging for identifying and characterizing luminescent compounds.