Doseok Kim, Myounghee Lee, Taekyu ShimDepartment of Physics, Sogang University

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

www.sogang.ac.kr/~nlopt

Photoluminescence properties of hemicyanine dyes

in nanosized zeolite pores

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Outline

- Change of PL decay lifetime vs. environment

- Forster energy transfer

- Determination of hyperpolarizability components of NLO molecule

Photoluminescence decay lifetime measurement

Our system: Hemicyanine / zeolite (nanoporous system)

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- Absorption of a photon (very fast)- Vibrational relaxation (~ps)- Fluorescence parameters we can study

spectrum, quantum yield, lifetime, anisotropy

Photoluminescence from a dye molecule

Cy3

As the dye concentration increases, 1. red-shift of PL peak

2. PL quenching nonradiative relaxation

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Steady state PL & PL decay characteristicsUse different colors for lines and symbols.Adjust the font size as you resize the graph

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fluorescence

Raman signal

Raman signal

polarizer

crossed polarizer

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