Abstract In this work, we show evidence of enhanced photocatalytic activity in mechanically activated graphite-zinc oxide (ZnO) composites using time-resolved photoluminescence (TRPL) and time-integrated (TIPL) spectroscopy. The graphite-ZnO were synthesized through facile mixing grinding graphite ZnO precursors without any heat treatment. ground at room temperature with varying to mass ratios ...

GaAs(0 0 1) substrates nitrided with N2 plasma at various temperatures were investigated after being exposed to air for 40 days. They studied by means of parallel angle-resolved X-ray photoelectron spectroscopy, scanning electron microscopy, micro-photoluminescence and time-resolved photoluminescence (TRPL). Several GaAs Schottky diodes manufactured find the optimal nitridation conditions high ...

We report the results of time-integrated and time-resolved photoluminescence spectroscopy on red-emitting self-organized InAs/Al0.6 Ga0.4As quantum dots with indirect barriers. Spatially resolved PL measurements confirm that carriers excited in the Al0.6Ga0.4As barriers are consistent with a carrier hopping process between dots, a result also supported by time-resolved PL experiments. q 2003 El...

We discuss properties of cw and time-resolved photoluminescence (PL) as well as photoluminescence excitation (PLE) from co-doped ZnSe:Cl,N samples. These samples are characterized by the presence of the potential fluctuations due to charged donors and acceptors. We compare intensity dependent cw PL with the theory and find a good agreement. We also find that the material parameters obtained fro...

Ultrafast two-color pump-probe measurements, time-resolved photoluminescence TRPL , and photoluminescence excitation measurements were performed on Si-rich nitride SRN and Er doped SRN Er:SRN nanocrystals samples. Transient absorption data were compared with picosecond TRPL and excited state absorption cross ESA sections were measured at different wavelengths. Our data show that in Er:SRN, whic...

Applications of time-resolved photoluminescence spectroscopy (TRPL) and fluorescence lifetime imaging (FLIM) to the analysis of cultural heritage are presented. Examples range from historic wall paintings and stone sculptures to 20th century iconic design objects. A detailed description of the instrumentation developed and employed for analysis in the laboratory or in situ is given. Both instru...

We utilized time-integrated and time-resolved photoluminescence of a-axis and c-axis gallium nitride nanowires to elucidate the origin of the blue-shifted ultraviolet photoluminescence in a-axis GaN nanowires relative to c-axis GaN nanowires. We attribute this blue-shifted ultraviolet photoluminescence to emission from surface trap states as opposed to previously proposed causes such as strain ...

In view of its band gap of 2.2 eV and its stability, methylammonium lead bromide (MAPbBr3) is a possible candidate to serve as a light absorber in a subcell of a multijunction solar cell. Using complementary temperature-dependent time-resolved microwave conductance (TRMC) and photoluminescence (TRPL) measurements, we demonstrate that the exciton yield increases with lower temperature at the exp...

Understanding the role that exciton diffusion plays in organic solar cells is a crucial to understanding recent rise power conversion effciencies brought about by non-fullerene acceptors (NFA). Established methods for measuring lengths require specialized equipment designed high-resolution time-resolved photoluminescence (TRPL). Here we introduce technique, coined pulsed-PLQY, measure length of...

In an effort to elucidate the spin (rather than charge) degrees of freedom in colloidal semiconductor nanocrystal quantum dots, we report on a series of static and time-resolved photoluminescence measurements of colloidal CdSe quantum dots in ultrahigh magnetic fields up to 45 T. At low temperatures (1.5-40 K), the steady-state photoluminescence (PL) develops a high degree of circular polarizat...