Sorry but the answer is not right
Zach. What you refer to is known as an EXCITATION spectrum. Photolumienescence is the emisson of light after excitation by another light source in general.
Fluoresecence is an example of photoluminescence; it is the so-called prompt emission after exciation, which means emisson within say 1 microsecond. This is in contrast to phosporecence and delayed fluorescence whic occur ata time-scale of say milliseconds and (much) longer.
In photoluminescence spectroscopy (i.e. 'excitation' spectroscopy), you're examining how the intensity of light emitted at a single, fixed wavelength varies when your sample is exposed to different excitation wavelengths.
In fluorescence spectroscopy (i.e. 'emission' spectroscopy), you're looking at the intensity of light emitted by your sample at different wavelengths when it is exposed to a single, fixed excitation wavelength.
Sorry but the answer is not right
Zach. What you refer to is known as an EXCITATION spectrum. Photolumienescence is the emisson of light after excitation by another light source in general.
Fluoresecence is an example of photoluminescence; it is the so-called prompt emission after exciation, which means emisson within say 1 microsecond. This is in contrast to phosporecence and delayed fluorescence whic occur ata time-scale of say milliseconds and (much) longer.
I guess you are talking about phosphorescence, which originated from a triplet excited state, vs fluorescence process from a singlet excited state.
A Luminescence stimulated by light absorption in UV-Vis-NIR spectral region, represents any process in which material absorbs electromagnetic energy at a certain wavelength and then emits part of it at a different (usually longer) wavelength (Photoluminescence).
While Fluorescence is a “fast” Photoluminescence. The effect is widely used in such everyday practical applications as industrial and residential lightning (neon and fluorescent lamps) as an analytical technique in science and as a quality and process control method in industry.
Photoluminescence is the emission of an absorbed radiant energy in the form of light. Photoluminescence is divided into two categories: fluorescence and phosphorescence.
Fluorescence is the emission of a photon from the singlet excited state to the singlet ground state or between any two energy levels with the same spin.
The probability of fluorescence is very high and the average lifetime of an electron in the excited state is only 10^-5 to 10^-8 sec .
Phosphorescence is the emission of a photon from a triplet excited state to a singlet ground state or between any two energy levels that differ in their respective spin states. The average lifetime for phosphorescence ranges from 10^-4 to 10^4 sec .
In either fluorescence or phosphorescence the frequency of the emitted radiation is less than the frequency of incident radiation.
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