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					            Photoluminescence properties of
                   hemicyanine dyes
               in nanosized zeolite pores

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                  Doseok Kim, Myounghee Lee, Taekyu Shim
                          Department of Physics, Sogang University

                         Hyunsung Kim, Kyung Byung Yoon
                        Department of Chemistry, Sogang University


                                  www.sogang.ac.kr/~nlopt
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     Outline
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 Photoluminescence decay lifetime measurement
 Our system: Hemicyanine / zeolite (nanoporous system)
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     - Change of PL decay lifetime vs. environment

     - Forster energy transfer

     - Determination of hyperpolarizability components of NLO molecule

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Photoluminescence from a dye molecule

 -   Absorption of a photon (very fast)
 -   Vibrational relaxation (~ps)
 -   Fluorescence parameters we can study             Cy3
      spectrum, quantum yield, lifetime, anisotropy
   Steady state PL & PL decay characteristics
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                                              low                 high concentration
                          40000



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                                  440   480   520    560    600       640   680   720                         0      2    4      6         8   10   12     14
                                                    wavelength (nm)                                                            Time (ns)


                            As the dye concentration increases,
                                          1. red-shift of PL peak                                                 nonradiative relaxation
                                          2. PL quenching
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fluorescence
               Raman
               signal
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                                     Raman
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                                          70     (a)                                 [BMIM]BF4
                 surface tension (mN/m)



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                                           0.0         0.2      0.4        0.6        0.8         1.0
                                                               mole fraction
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posted:2/28/2013
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