Research Papers: General

Transfer of ultraviolet photon energy into fluorescent light in the visible path represents a new and efficient protection mechanism of sunscreens

[+] Author Affiliations
Theognosia Vergou, Christina Antoniou

A. Sygros Hospital, Department of Dermatology, University of Athens, Athens, Greece

Alexa Patzelt, Heike Richter, Sabine Schanzer, Wolfram Sterry, Juergen Lademann

Charité-Universitätsmedizin Berlin, Center of Experimental and Applied Cutaneous Physiology, Department of Dermatology, Berlin, D-10117, Germany

Leonhard Zastrow, Karin Golz, Olivier Doucet

COTY Lancaster, International Research and Development Center, Monaco, 98000 MC

J. Biomed. Opt. 16(10), 105001 (October 03, 2011). doi:10.1117/1.3631790
History: Received June 08, 2011; Revised August 04, 2011; Accepted August 08, 2011; Published October 03, 2011; Online October 03, 2011
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The development of sunscreens with high sun protection factor (SPF) values but low filter concentrations is the ultimate goal. The purpose of the present study was to investigate why a sunscreen spray and cream with different concentrations of the same UV-filters provided the same SPF. Therefore, the homogeneity of the distribution of both sunscreens was investigated by laser scanning microscopy (LSM) and tape stripping (TS). Additionally, the energy transfer mechanisms of the sunscreens on the skin were analyzed. The TS and LSM showed a better homogeneity of the distribution of the spray. With Wood's light, a total absorption of the irradiation was detected in the spray area. In contrast, after cream treatment, an intensive fluorescent signal was observed. It was demonstrated that this fluorescent signal was caused by nonthermal energy transferred from the UV-filters to one compound of the cream releasing its excitation energy by fluorescence. This nonthermal energy transfer seemed to be the reason for the high efficiency of the cream, which is subjected to thermal relaxation. The transfer of UV photon energy into fluorescent light represents a new approach to increase the efficiency of sunscreens and could form the basis for a new generation of sunscreens.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Theognosia Vergou ; Alexa Patzelt ; Heike Richter ; Sabine Schanzer ; Leonhard Zastrow, et al.
"Transfer of ultraviolet photon energy into fluorescent light in the visible path represents a new and efficient protection mechanism of sunscreens", J. Biomed. Opt. 16(10), 105001 (October 03, 2011). ; http://dx.doi.org/10.1117/1.3631790


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