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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Particle Size-Dependent Metal-Enhanced Fluorescence of Dyes on Homogeneous Silver Colloidal Surfaces

등록일
2019년 2월 14일 16시 01분 52초
접수번호
4503
발표코드
PHYS.P-209 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 19일 (금요일) 11:00~12:30
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Daedu Lee, Junghyun Song, Yoonsoo Pang*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
Metal-enhanced fluorescence (MEF) has been extensively studied in many disciplines due to significant increases in the emission intensity and photostability of dyes. In this study, homogeneous silver colloidal films (SCFs) with the particle diameters from ~70 to 200 nm were fabricated for fluorescence enhancements. MEF and excited state dynamics of DCM and Rh700 with SCFs were investigated by time-resolved fluorescence spectroscopy, where fluorescence enhancements were stronger where the dipolar SPR bands of SCFs overlap with the emission spectra of dyes. Although the particle size-dependence of fluorescence enhancements with SCFs mainly arises from the excitation enhancements, the emission enhancements of dyes with small quantum yields are often overestimated with an assumption of knr,mknr. We propose an improved analysis method, which is based on the fluorescence enhancements with a SCF in off-resonance with the emission bands of dyes, and the FDTD simulations for the average local electric fields. By this method, the particle size-dependent excitation and emission enhancements of Rh700 with all SCFs were precisely evaluated. The MEF of Rh700 with SCFs is mainly attributed to the excitation enhancements, but also shows a strong particle size-dependence.

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