editorial promptanddelayedfluorescences · 2012. 12. 6. · carbon compound,...

Hindawi Publishing CorporationInternational Journal of PhotoenergyVolume 2012, Article ID 786384, 2 pagesdoi:10.1155/2012/786384

Editorial

Prompt and Delayed Fluorescences

Korkut Yegin,1 S. Ipek Karaaslan,2 and Necdet Aslan2

1 Department of Electrical and Electronics Engineering, Yeditepe University, 34755 Istanbul, Turkey2 Physics Department, Yeditepe University, 34755 Istanbul, Turkey

Correspondence should be addressed to Korkut Yegin, [email protected]

Received 6 December 2012; Accepted 6 December 2012

Copyright © 2012 Korkut Yegin et al. This is an open access article distributed under the Creative Commons Attribution License,which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The photophysical and chemical behaviors of certain mate-rials manifest themselves in the form of prompt and delayedfluorescence. This issue compiles eight exciting manuscriptson prompt and delayed fluorescence with broad range ofapplications.

Acoustic cavitation of gold nanoparticles in acid solu-tions by spectrofluorometry method was explored in detailby A. Sezegania et al. They show that Acoustic cavitation inthe presence of gold nanoparticles provides a new way forimproving therapeutic effects on the tumors in sonodynamictherapy.

Structural configuration of mylein figures using fluores-cence micrsocopy was shown in this special issue by L. Tayebiet al. Employing epiflouerescent microscopy, they studied thelifetime and configuration of myelin figures in experiment oflipid hydration. They found direct correlations between thelifetime of myelin figures and the experimental conditionssuch as temperature, density of the parent stack, and thehydrophobicity of the substrate.

Microwave irradiation effects on the electronic structureof cresyl violet in solution was studied by F. Bayrakcekenet al. These changes are important because Cresyl violet isoften used as a staining agent for studying changes on DNAand RNA-rich compounds in tissues. Based on absorptionspectra, they concluded that cresyl violet molecular structuredue to the microwave irradiation was changed and thephononic product could not be used as a laser-dye aftermicrowave irradiation.

In another study by F. Bayrakceken et al. discrete absorp-tion and resonance coherent fluorescence line of silicondioxide were recorded photographically and discrete fluores-cence was observed at room temperature using high photonflux excitation spectroscopy. They state that it is possible

to use fused silica as a laser material in the UV or as a UVdetector with its inherit visible-blind property.

H. Ozturk and his colleagues showed that the inversionof ammonia molecule which results in split rotationalspectral lines can be used to detect presence of ammonia inwater for counter bioterrorism applications. Millimeter waveabsorption using a coherent source and detector was used toprovide experimental evidence.

F. Bayrakceken et al. analyzed polycyclic aromatic hydro-carbon compound, 1,2:3,4-dibenzanthracene spectroscopi-cally in ethanol. Ultraviolet absorption spectra and fluores-cence measurements were performed to show that Stokes’lines were discernible. Being a carcinogenic compound, thedetection of 1,2:3,4-dibenzanthracene presence in environ-ment as a pollutant is crucial in many applications.

M. A. Yesil studied millimeter wave absorption of TiO2

nanoparticles deposited on glass assembly. Absorption ofmillimeter waves by a thin film of TiO2 nanoparticlesat distinctive frequency band was shown with a networkanalyzer.

Optical energy transfer at room temperature plays animportant role in many applications. Electronically excitednaphthalene with 200–260 nm ultraviolet (UV) light emitsphotons in its emission band and the emitted photons areabsorbed by biacetyl, and then, excited biacetyl phosphores-cence. The resulting phosphorescence was shown to be verystable with emission peak at 545 nm for different excitationwavelengths from 200 to 260 nm. Similar optical energytransfer was shown from pyrazine to biacetyl. Optical energytransfer mechanisms were detailed.

By compiling this special issue, we hope to enrich ourreaders and researchers understanding and broad applica-tions of prompt and delayed fluorescence.

2 International Journal of Photoenergy

Acknowledgment

We also pay special tribute to Professor Fuat Bayrakceken,an inspirational scientist, whom we lost unexpectedly duringthe preparation of this special issue. Professor Bayrakcekenwas mostly known with his discovery of a new fluorescencetype known as B-type fluorescence.

Korkut YeginS. Ipek Karaaslan

Necdet Aslan

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