研究目的
Investigating the reversible modulation of fluorescence intensity of CdSe/ZnS quantum dots in solutions with diarylethenes through photochromic transformations.
研究成果
The study demonstrated reversible modulation of QD fluorescence intensity in toluene solutions with photochromic diarylethenes, mainly due to fluorescence reabsorption (inner filter effect) and partially due to F?rster resonant energy transfer. The interaction between QDs and diarylethenes affects the fluorescence decay lifetime, with chemical nature and concentration of diarylethenes being key factors.
研究不足
The study is limited to toluene solutions and specific types of quantum dots and diarylethenes. The mechanism of irreversible lowering of fluorescence decay lifetime after UV irradiation is not fully understood and requires further investigation.
1：Experimental Design and Method Selection:
The study involved steady-state and time-resolved fluorescence spectroscopy methods to investigate the interaction between CdSe/ZnS quantum dots and photochromic diarylethenes in toluene.
2：Sample Selection and Data Sources:
Two types of CdSe/ZnS QDs emitting at 525 nm and 600 nm were used, along with two kinds of diarylethenes (DAE1 and DAE2).
3：2). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: SPECORD 200 spectrophotometer, SM2203 spectrofluorimeter, picosecond PDL 800B diode laser with LDH-405 and LDH-470 laser heads, PMA-182 photodetector unit, TCSPC board TimeHarp200, LEDs with maxima of emission bands at 365 nm, 514 nm, and 627 nm.
4：Experimental Procedures and Operational Workflow:
Solutions of QD in toluene were mixed with DAE to obtain the needed molar ratio. Absorption and fluorescence spectra were measured before and after UV irradiation.
5：Data Analysis Methods:
Fluorescence decay kinetics were analyzed using time-correlated photon counting (TCSPC) method and global analysis method.
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