PbTe colloidal nanocrystals: Synthesis, mechanism and infrared optical characteristics

Quantum size effect on the layer by layer assembly of PbTe–InSe multilayer nanocomposite structures

“…The sample with highest L w shows two more new peaks at higher angle corresponding to (2 2 0) and (4 0 0) plane of crystallographic PbTe. The peak positions and d-spacing are good agreement with reported works for PbTe quantum dots [10,13]. The average crystalline size of the PbTe NCs were calculated using Scherer's equation [22] is displayed in Table 1.…”

“…PbTe quantum wells (QWs) and NCs or quantum dots (QDs) prepared by solution methods (such as colloidal and self-assembled method) and their optical properties and device applications have been extensively explored [10e13]. In most of the studies, PbTe NCs are obtained by solution methods [13,14]. however, chemically synthesized NCs typically capped with long tail organic ligands cannot be directly implemented in electronic circuits due to weak inter-particle coupling which are momentous limits for device applications [15].…”

Novel PbSe nanocrystals doped fluorogermanate glass matrix

“…Lead chalcogenides show strong quantum confinement effects due to its large Bohr radius compared with the II-VI compounds (CdTe, CdS and CdSe). PbSe has a band gap of 0.28 eV at room temperature and a Bohr radius exciton of 46 nm approximately [7][8][9][10]. Control and manipulation of size and morphology of crystalline nanomaterials are an interesting objective in modern material's science, chemistry, and physics.…”

Broadband near-infrared luminescence and tunable optical amplification around 1.55μm and 1.33μm of PbS quantum dots in glasses

“…Based on their quantum confinement effect, QDs show a variety of size dependent properties, which exhibit potential applications in the areas of lasers, saturable absorbers, bio-labels, light emitting diodes (LED), etc. [1][2][3][4][5][6][7][8]. Among most II-VI and III-V QDs, although the exciton Bohr radii (a B ) is typically ∼10 nm or more, the Bohr radii of individual electron (a e ) is much larger than that of hole (a h ) due to the large difference in their effective masses [9].…”