During the synthesis of CdTe quantum dots (QDs) by hydrothermal method, a CdS shell layer is naturally formed thermal decomposition thiol ligands, and CdTe/CdS core/shell QDs are produced. Herein, we investigate selective to control ligands changing Te/Cd molar ratio precursor solutions. From experimental results X-ray photoelectron spectroscopy optical properties absorption photoluminescence (...

In this paper, Zn2SiO4:xEu3+ phosphors were synthesized with different concentrations of Eu3+ ions (x = 1, 3 and 5 wt.%) by using waste bottle glasses as silicate source. The structure, morphology, and luminescent properties of the phosphors were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and photoluminescence (PL) spectroscopy. The XRD ana...

Size tunable Cadmium sulphide (CdS) quantum dots have been synthesized through wet chemical co-precipitation method, at three different temperatures 35C, 50C and 65C for varying pH values of 9 and 10.5 respectively. The solution was prepared using Cadmium chloride and thiourea as material precursors, ammonium hydroxide as precipitating agent and mercaptoethanol as surfactant. Thin films of thes...

In this article, we demonstrate the surface effect and optoelectronic properties of holmium (Ho(3+))-doped ZnO in P3HT polymer nanocomposite. We incorporated ZnO:Ho(3+) (0.5 mol% Ho) nanostructures in the pristine P3HT-conjugated polymer and systematically studied the effect of the nanostructures on the optical characteristics. Detailed UV-Vis spectroscopy analysis revealed enhanced absorption ...

Fine structure related to different types of atomic arrangements (short-range order, phase separation and quantum dots) was observed in high-spatial-resolution low-temperature photoluminescence (PL) spectra of GaAsInN, GaAsSbN and GaAsInSbN quantum wells (QWs) containing ∼1.5% N and emitting at 1.2–1.3 μm. Using photoreflectance and temperature-dependent PL spectroscopy, we measured the activat...

We used near-field scanning optical microscopy (NSOM) having spatial resolution ∼100 nm in combination with diffraction-limited micro-photoluminescence (μ-PL) and time-resolved (TR) spectroscopy to study emission properties of single colloidal CdSe nanowires (NWs). Comparison of NSOM and wide-field μ-PL images allows observation of residual chemical and/or water drops attached to a NW, which ac...

Improvement of the photovoltaic efficiency via exposure of organic poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) devices to solvent vapor at room temperature is reported. In situ photoluminescence (PL) and Raman spectroscopy, in conjunction with ex situ optical absorption and atomic force microscopy, have been used to provide insight into the nanoscale morphologi...

The microscopic orientation and position of photoactive molecules is crucial to the operation of optoelectronic devices such as OLEDs and solar cells. Here, we introduce a shape-persistent macrocyclic molecule as an excellent fluorescent probe to simply measure (i) its orientation by rotating the excitation polarization and recording the strength of modulation in photoluminescence (PL) and (ii)...

Time-resolved photoluminescence ~PL! spectroscopy has been used to study the radiative recombination of excitons bound to ionized donors in GaN doped with both Mg and Si at concentrations of 5310/cm and 1.5310/cm, respectively. Low temperature (T;10K) time-resolved, as well as integrated PL spectra, identify an ionized donor-bound ~Si! exciton peak (DX) approximately 11.5 meV below and a neutra...

We have performed a comprehensive investigation of n-type quantum dot infrared photodetectors ~QDIPs! based on InAs/GaAs epitaxical island quantum dots ~QDs! grown via the innovative punctuated island growth technique. The structural properties of the QDs were investigated with cross-sectional transmission electron microscopy and atomic force microscopy. The electronic properties of the QDs ins...