The paper shows "the corresponding emission spectra of blue and green FCP(fluorescent copolymer) at various excitation wavelengths showed that the peaks of emission spectra had nearly not shifted as excitation wavelengths change (Fig. 1C and D), which indicated good monodispersion of FCP in size and fluorescence."
But I don't understand why they are related.
As far as I know, isn’t the emission wavelength independent of the excitation wavelength?
So why it can mean good monodispersion of FCP in size and fluorescence.
Could someone can explain to me? Thanks!
Hello,
The wavelength dependency or independency is mainly related to the presence of different sized particles which is also called polydispersity. Although it may be related with the surface adsorbed functional groups too. If you go for a colloidal synthesis of QDs certainly you will get different sized particles and hence a wavelength dependent behaviour, however, if you perform membrane filteration you will be left with a finite sized particles and there will be no wavelength dependency.
Dear Iris Chiang ,
The diversity in wavelength of the emitted spectrum depends on the diversity of the energy level difference between the occupied conduction electronic sates and the empty valence sate.
If the variations of these levels are narrow then one would get an emission spectra which has more or less the same emission spectrum.
So, I agree with Rezvan Marjani .
Best wishes
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Physical Phenomena
- Luminescence
- Fluorescence