We report on time resolved photoluminescence (PLRT) measurements in poly(p-phenylene vinylene) (PPV) films irradiated by laser in the presence of air. We observe a PL intensity enhancement and a biexponential decay dynamics of PL signal for all irradiated films. These results can be understood in terms of a chain shortening process due to carbonyl incorporation and formation of an energy profil...

In this work, we present the temperature-dependence and time-resolved photoluminescence (PL) of CdS nanoparticles capped independently with three different ligands thiophenol, thioglycerol, and l-cysteine over a broad temperature range from 10 to 300 K. The respective nanoparticles sizes in the three systems studied in this work are 1.5, 4, and 2 nm as determined from X-ray diffraction (XRD). F...

In this paper we show that a multilayer Zn-Se-Te system, grown by molecular beam epitaxy in such a way as to contain sub-monolayer quantities of Te (so-called delta-doped ZnSe:Te), exhibits optical properties consistent with the presence of quantum size centers. We present results of excitation intensity and temperature dependent cw photoluminescence (PL) as well as time-resolved PL measurement...

Inorganic-organic halide organometal perovskites have demonstrated very promising performance for opto-electronic applications, such as solar cells, light-emitting diodes, lasers, single-photon sources, etc. However, the little knowledge on the underlying photophysics, especially on a microscopic scale, hampers the further improvement of devices based on this material. In this communication, co...

We observe localization of excitons in semiconducting single-walled carbon nanotubes at room temperature using high-resolution near-field photoluminescence (PL) microscopy. Localization is the result of spatially confined exciton energy minima with depths of more than 15 meV connected to lateral energy gradients exceeding 2 meV/nm as evidenced by energy-resolved PL imaging. Simulations of excit...

In insect photoreceptors, absorption of a photon by a visual pigment molecule triggers a cascade of biochemical reactions culminating in opening of cationic channels belonging to the TRP (transient receptor potential) superfamily (Hardie, 2014). Until recently, these light-activated channels were identified and studied exclusively in the fruit fly Drosophila melanogaster. Its photoreceptors exp...

Abstract We compare the low-temperature photoluminescence (PL) intensities of a range GaInN/GaN quantum well (QW) structures under identical excitation conditions, mounting samples side by side. Normalizing measured intensity to absorbed power density in QWs, we find that PL efficiencies several samples, which show close 100% internal efficiency (IQE) time-resolved PL, saturate at nearly an val...

We have tested the proposal that the light-sensitive conductance in Drosophila is composed of two independent components by comparing the wild-type conductance with that in mutants lacking one or the other of the putative light-sensitive channel subunits, TRP and TRPL. For a wide range of cations, ionic permeability ratios in wild type were always intermediate between those of trp and trpl muta...

0022-3093/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.jnoncrysol.2009.01.048 * Corresponding author. Tel.: +7 9086312122. E-mail addresses: [email protected], fmpk_john@ In this paper we present results of a low-temperature time-resolved photoluminescence (PL) investigation of thin SiO2 films implanted with silicon ions. In addition to the luminescence of well-known ODCs, some other ...

A light-induced photoluminescence (PL) enhancement in surface-deposited methylammonium lead iodide (CH3NH3PbI3) perovskites was investigated in detail using time-resolved luminescence microscopy. We found the PL intensity to increase up to three orders of magnitude upon light illumination with an excitation power density of 0.01-1 W cm(-2). The PL enhancement is accompanied by an increase of th...