Bifunctional magnetic-fluorescent composite nanoparticles (MPQDs) with Fe(3)O(4) MPs and Mn:ZnS/ZnS core-shell quantum dots (QDs) encapsulated in silica spheres were synthesized through reverse microemulsion method and characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, vibration sample magnetometer, and photoluminescence (PL) spectra. Our ...

Incorporation of non-luminescent dodecanethiolate-protected gold clusters into regioregular poly(3-hexylthiophene) films results in a 6-fold increase in the visible photoluminescence (PL) of the polymer, which arises predominantly from NP-induced structural changes in the composite films.

The role of intrinsic point defects on radiative recombination in Cu(In,Ga)Se2 thin films was investigated by photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies. Experiments were performed on device-grade polycrystalline layers and single crystal thin films. PL transitions identified by others as indicating a shallow state with an ionization energy of ~16 meV is propos...

We report on the influence of doping, temperature, porosity, band gap, and oxidation on the photoluminescence ~PL! properties of anodically etched porous a-Si:H and a-Si:C:H thin films. Only boron-doped, p-type a-Si:H samples exhibited visible photoluminescence. Two broad PL peaks at ;1.6 and ;2.2 eV are apparent in room temperature PL spectra. The intensity of the 2.2 eV peak as well as the na...

Photoluminescence of Monolayer MoS2 The Ti-doped monolayers with ultra-high photoluminescence (PL) intensity are successfully synthesized through chemical vapor transport as reported in article number 2200431 by Zhao Ma, Hailong Qiu, and co-workers. PL from the is 85-fold stronger than that pristine MoS2. giant enhancement attributed to dopant-induced O-Ti-S units improved interaction between m...

The molecular origin of the photoluminescence of carbon dots (CDs) is not known. This restricts the design of CDs with desired optical properties. We have synthesized CDs starting from carbohydrates by employing a simple synthesis method. We were able to demonstrate that the CDs are composed of aggregated hydroxymethylfurfural (HMF) derivatives. The optical properties of these CDs are quite uni...

Features in Photoluminescence Map of SWNTs Over the past seven years photoluminescence (PL) spectroscopy has emerged as an important characterization tool for determining the (n, m) chirality and population of semiconducting SWNTs. This technique is essential for the chirality selective growth and/or the separation depending on chirality. Under excitation with the appropriate wavelength of ligh...

Single-walled carbon nanotubes (SWNTs) are promising materials for in vitro and in vivo biological applications due to their high surface area and inherent near infrared photoluminescence and Raman scattering properties. Here, we use density gradient centrifugation to separate SWNTs by length and degree of bundling. Following separation, we observe a peak in photoluminescence quantum yield (PL ...

Luminescent silicon nanocrystals (Si NCs) have attracted tremendous research interest. Their size dependent photoluminescence (PL) shows great promise in various optoelectronic and biomedical applications and devices. However, it remains unclear why the exciton emission is limited to energy below 2.1 eV, no matter how small the nanocrystal is. Here we interpret a nanosecond transient yellow emi...

A simple, effective and green bottom-up method for the synthesis of highly fluorescent N doped graphene oxide quantum dots (GOQDs) and polymer-like quantum dots (PQDs) was developed on the basis of rapid one-step microwave assisted pyrolysis of citric acid (CA) and diethylenetriamine (DETA) in different reaction solvents. Both one-photon-induced and two-photon-induced photoluminescence (PL) pro...