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Interlayer energy transfer between carbazole and two 9-anthroyloxy derivatives in Langmuir-Blodgett films

Kristine Kilså-Jensen (Institutionen för fysikalisk kemi) ; Bo Albinsson (Institutionen för fysikalisk kemi) ; M. Van der Auweraer ; E. Vuorimaa ; H. Lemmetyinen
Journal of Physical Chemistry B (1089-5647). Vol. 103 (1999), 40, p. 8514-8523.
[Artikel, refereegranskad vetenskaplig]

The interlayer excitation energy transfer between 11-(9-carbazole)undecanoic acid (II-CU) and two 9-anthroyloxy derivatives, 9-(9-anthroyloxy)stearic acid (9-AS) and 2-(9-anthroyloxy)stearic acid (2-AS), in alternating multilayer Langmuir-Blodgett films has been studied. The 11-CU fluorescence is quenched by energy transfer to 9-AS or 2-AS as judged by steady-state and picosecond time-resolved fluorescence measurements. The fluorescence decay curves of 11-CU in the films were analyzed in the framework of several models: (1) a general model for interlayer energy transfer, (2) a two-exponential decay, (3) a Forster model for energy transfer in a two-dimensional system, and (4) a stretched-exponential decay, characteristic of Forster energy transfer in self-similar fractal-like structures. The recovered decay parameters suggest an inhomogeneous mixing of the acceptor molecules in LB films leading to a two-phase system. The phase separation during compression of the acceptor monolayers forms regions of acceptor concentration about 3 times that of the intended and regions with very low acceptor concentration.



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Denna post skapades 2012-09-24.
CPL Pubid: 163850

 

Institutioner (Chalmers)

Institutionen för fysikalisk kemi (1900-2003)

Ämnesområden

Nanovetenskap och nanoteknik
Kemi

Chalmers infrastruktur