Improved photoluminescence quantum yield and stability of CdSe-TOP, CdSe-ODA-TOPO, CdSe/CdS and CdSe/EP nanocomposites

Molybdenum and Tungsten Sulfide Ligands for Versatile Functionalization of All-Inorganic Nanocrystals

“…The formation of type-II states in core@shell nanostructures generally shows featureless absorption tails into longer wavelength regions due to carrier delocalization. 42,43 The PL properties of both the Cl − -and S 2− -capped CdSe NCs (Figure 4d) were improved by the treatment. However, the peaks in the PL spectra of Cl − -and S 2− -capped CdSe NCs were shifted to shorter and longer wavelengths by more than 40 nm from that of the primary organics-capped NCs, similar to their absorption spectrum.…”

“…This can be attributed to the formation of a quasi-type-II CdSe@CdS core@shell structure, which has an electronic structure where the core CdSe lowest unoccupied molecular orbital (LUMO) level is close to the shell CdS LUMO level. The formation of type-II states in core@shell nanostructures generally shows featureless absorption tails into longer wavelength regions due to carrier delocalization. , The PL properties of both the Cl – - and S 2– -capped CdSe NCs (Figure d) were improved by the treatment. However, the peaks in the PL spectra of Cl – - and S 2– -capped CdSe NCs were shifted to shorter and longer wavelengths by more than 40 nm from that of the primary organics-capped NCs, similar to their absorption spectrum.…”

Photostability and long-term preservation of a colloidal semiconductor-based single photon emitter in polymeric photonic structures

“…To solve this problem, surface passivation or incorporation of colloidal QDs into organic environments has been proposed. [15][16][17][18][19][20] Positive environmental effects are reported on the ensemble molecular scale, [15][16][17]21 meanwhile, a number of intriguing phenomena have not been revealed at the single molecule level. Further investigations remain challenging due to the small size, photo-bleaching of single QDs and numerous related photo-chemical events.…”