Luminescence is one of the most important characterisation tools of semiconductor materials and devices. Recently, a very efficient analytical set of equations has been applied to explain optical properties of dilute semiconductor materials, with an emphasis on the evolution of peak luminescence gain with temperature and its relation to sample quality. This paper summarizes important steps of t...

We demonstrate what is to our knowledge the first example of four-photon luminescence microscopy in GaN and apply it to quality mapping of bulk GaN. The simultaneously acquired second- and third-harmonic generation can be used to map the distribution of the piezoelectric field and the band-tail state density, respectively. Through spectrum- and power-dependent studies, the fourth power dependen...

The paper describes the applications of solid surface luminescence measurements in the fields of cryogenic and room temperature phosphorescence, fluorescence immunoassays, and other areas. In many examples highly specific and sensitive assays are obtained by combining luminescence measurements with thin layer chromatography, and other laminar methods such as electrophoresis. Thin layer phosphor...

Objective(s): This paper describes synthesisPolyvinyl Alcohol/CaF2:Er nanofibers because of  its  photoluminescence properties.Materials and Methods:  First, CaF2:Er nanocomposite synthesized with co-precipitation method. In order to prepare polyvinyl alcohol (PVA)/CaF2:Er nanofibers, CaF2:Er nanocomposites were added to the polyvinyl alcohol (PVA) polymer. PVA/CaF2:Er composite nanofibers were...

introduction of the metallic nanoparticles (nps) in the bulk glass received a large interest due to their versatile applications. the effect of silver nps on optical properties of the eu3+-doped zinc tellurite glasses is presented for the first time. glass samples are prepared by melt-quenching technique. the surface plasmon absorption bands of silver nps are recorded in the visible region. the...

we have investigated an optically stimulated luminescence (osl) dating study in the nimbluk lakebed in khorasan, northeast iran. two samples of the lake-bed sediments from ~1 m below the land surface are successfully dated at 7.3-9.9 ka. all necessary experiments have been performed to choose the most suitable procedure for dating quartz extracts using single aliquot regeneration method (sar). ...

Éva Hideg and Sándor Demeter Institute of Plant Physiology, Biological Research Center, Szeged, P.O. Box 521. Hungary, H-6701 Z. Naturforsch. 43c , 596-600 (1988); received May 2, 1988 Photosynthesis, Photosystem I I , Thermoluminescence, Delayed Luminescence The thermoluminescence and delayed luminescence characteristics of PS I I „ and PS I I p centers were investigated in B B Y particles and...

Sr2YF7, as an important matrix for trivalent lanthanide (Ln(3+)) ions to fabricate upconversion (UC) or downshifting (DS) phosphors, has been rarely reported. Herein, monodisperse and size-controllable tetragonal-phase Ln(3+)-doped Sr2YF7 nanoparticles (NPs) were synthesized via a facile thermal decomposition method. Upon excitation at 980 nm, UC luminescence properties of Sr2YF7:Ln(3+)/Yb(3+) ...

Singlet oxygen (¹O₂) is an important reactive intermediate in photodynamic reactions, particularly in antimicrobial PDT (aPDT). The detection of ¹O₂ luminescence is frequently used to elucidate the role of ¹O₂ in various environments, particularly in microorganisms and human cells. When incubating the fungus, Candida albicans, with porphyrins XF73 (5,15-bis-[4-(3-Trimethylammonio-propyloxy)-phe...

We investigated the effects of cyclic nucleotides (cGMP and cAMP) and inositol triphosphate/diacylglycerol pathways on the KCl-induced luminescence control of the ophiuroid species Amphiura filiformis, Ophiopsila aranea and Ophiopsila californica. Results show that dibutyrylcGMP, the cGMP analogue, and sodium nitroprusside, the guanylyl cyclase activator, had no effect on the luminescence of O....