Synthesis and optical properties of tunable dual emission copper doped CdTe1-xSex alloy nanocrystals

Phonon Characterization, Structural and Optical Properties of Type-II CdSe/CdTe core/shell and Type-II/type-I CdSe/CdTe/ZnS core/shell/shell Quantum Dots

“…The PL spectra of CdSe QDs shows a peak at ~ 575 nm corresponding to the recombination of the electron in the conduction band and the holes in the valence band, known as excitonic emission. The broadened peak at ~ 714 nm with the lower intensity is assigned to the surface state of QDs [19]. The PL QY of CdSe core QDs is determined of 42.6 %.…”

Chemical Regulation of Fluorescence Lifetime

“…Hien and co-workers found that, compared to the CdTe 1−x Se x host, Cu-doped CdTe 1−x Se x QDs have much longer PL decay times, up to ∼1.8 μs. 68 The average lifetime showed a significant enhancement ranging from 9-to 18-fold when the concentration of Cu is increased from 1% to 10% (Figure 15d). The increase in the lifetime can be attributed to the localization of deeper states, which resulted in weaker overlap between the hole and electron wave functions.…”

“…The doping of Cu resulted in an increased PL lifetime, attributed to the combined effects of surface states, lattice strain, and spatial overlap between the conduction band electron wave functions and localized Cu states. Hien and co-workers found that, compared to the CdTe 1– x Se x host, Cu-doped CdTe 1– x Se x QDs have much longer PL decay times, up to ∼1.8 μs . The average lifetime showed a significant enhancement ranging from 9- to 18-fold when the concentration of Cu is increased from 1% to 10% (Figure d).…”

Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+doped CdS quantum dots

“…Doping semiconductor QDs with a suitable material is an important approach utilized in the nanotechnology field for modifying the material properties. 15 Effective doping can not only modify the electronic, structural, and optical properties of the host material but also enhance the photocatalytic properties of semiconductor nanostructure. In addition to the different synthesis approaches such as varying solvents and precursors and changing temperature which have been applied to modify the key properties of CdS QDs, the doping of the proper material is also an important route.…”