Tunable dual emission in type-I/type-II CdSe/CdS/ZnSe 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

“…This redshift is typical characteristics for type-II QDs due to the spatially indirect recombination of the charge carriers at the type-II heterojunction. The similar results were observed previously in studies of the type-I to the type-II transition in CdTe/CdSe [11] or CdS/ZnSe [3,6] QDs. The PL QY decrease from 42.6 % for CdSe core to 33.4 % for CdSe/CdTe core/shell QDs.…”

“…Colloidal semiconductors quantum dots (QDs) have been widely proposed to be used in applications such as light-emitting devices, lasers, photovoltaic and biomedical fluorescent labels because of the many desirable properties [1,2]. They have many advantages compared to organic fluorescence such as tunable emission wavelength, multiplexing capabilities, high-photoluminescence (PL) quantum yield (QY), and high photoresistance [2][3][4]. Recently, many studies have focused on the synthesis of the type-II semiconductor QDs.…”

“…Since Bawendi's first research in 2003 [10], for the first time, type-II CdTe/CdSe core/shell QDs were successfully prepared by using the colloidal chemical method. Afterwards, a series of type-II core/shell QDs such as CdS/ZnSe [3,6], CdTe/CdSe [11], CdTe/ZnSe [12], ZnTe/ZnSe [13], and ZnTe/CdSe [14] has been fabricated in recent years. For the above QDs, the type-II CdTe/CdSe core/shell QDs were fabricated more than other QDs, because it can be separated completely electrons and holes between the core and shell layers.…”

Strain Engineering and Electric Field Tunable Electronic Properties of Janus MoSSe/WX2 (X = S, Se) van der Waals Heterostructures

“…Different divisions can be made based on the band alignment of heterostructures. For example, type‐I heterostructures have many potential applications in photovoltaic devices . The heterostructures with a type‐II alignment are good candidates for applications in solar cells, diodes, and light‐emitting/lasing devices since the holes and electrons can be effectively separated.…”

Influence of precursor ratio and dopant concentration on the structure and optical properties of Cu-doped ZnCdSe-alloyed quantum dots

“…Binary semiconductor QDs are one of the most studied materials owing to their appealing electronic and optical properties like high absorption coefficient and high efficiency of radiative recombination. [2][3][4] From the list of various chalcogenide materials, cadmium (Cd) based compounds have been studied the most and are also used as building blocks for various applications like photovoltaics and biolabeling due to their narrow emission and broad absorption spectra. 5 But nowadays researchers are focusing on semiconductor ternary QDs as the chemistry and physical properties of ternary nanoclusters remain undeveloped and unexplored.…”