研究目的
To develop a new approach of using series of organic dye as reference to determine quantum yield efficiencies (QYs) for semiconductor nanocrystals (Quantum Dots, QDs) with improved accuracy by considering the sensitivity of the fluorescence spectrophotometer on wavelength as well as the excitation power intensity.
研究成果
A new approach for determination QYs for QDs is reported, which is more accurate than current approach by considering instrumental sensitivity on wavelength and the excitation power intensity.
研究不足
1. PMT based spectrophotometers likely are not suitable to measure QY for the sample with red emitting colors due to the rapid decaying in sensitivity. 2. The calculated C values are not suggested for the comparison between different type spectrometers.
1：Experimental Design and Method Selection:
A series of organic dyes with known QYs were selected and used as references. The PL emissions of as-prepared dye solutions were measured in different fluorescence spectrophotometers. The excitation wavelength, reported QYs, and maximum PL emission of the dyes were considered.
2：Sample Selection and Data Sources:
Organic dyes were dissolved in absolute ethyl alcohol with concentration adjusted to the range of absorption (OD)
3：03-Freshly prepared solution was used during the experiments. List of Experimental Equipment and Materials:
Fluorescence spectrophotometers (Hitachi F4500 and Ocean Optics QE65000), UV-visible photospectrometer.
4：Experimental Procedures and Operational Workflow:
The PL emission peak integrating area (Fr) was calculated for each sample; the absorption at exciting wavelength was measured using UV-visible photospectrometer separately.
5：Data Analysis Methods:
The QY of the targeting QDs was determined using equations considering the instrumental sensitivity on wavelength and the excitation power intensity.
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