研究目的
Investigating the influence of photoluminescence from integrating sphere walls on absolute quantum yield measurements and developing correction methods.
研究成果
The study successfully developed a theoretical description and a reliable correction method for the influence of IS-wall PL on QY measurements. The PL QY of Spectrafect was estimated to decrease from 0.09 to 0.015% for excitation shift from 320 to 440 nm. The findings highlight the importance of considering IS-wall PL in QY measurements and suggest potential improvements in IS material treatment to reduce parasitic luminescence.
研究不足
The study is limited by the sensitivity of the detection system and the spectral overlap between the sample PL and the IS-wall PL. The correction method's effectiveness depends on the accurate knowledge of the IS material's reflectance spectrum.
1：Experimental Design and Method Selection:
The study involves PL-micro-spectroscopy to investigate PL from Spectralon and Spectrafect materials. Theoretical description of QY determination including effects of PL from IS walls is developed.
2：Sample Selection and Data Sources:
Samples of Spectralon and Spectrafect materials were studied. The integrating sphere used was SF-coated 4-inch universal integrating sphere from SphereOptics GmbH.
3：List of Experimental Equipment and Materials:
Equipment includes a tunable excitation source (LDLS, EQ-99X from Energetiq), monochromator (Acton SP 2150i, Princeton Instruments), spectrometer (Acton SP2300i, Princeton Instruments), and CCD camera (Spec-10:400BR, Princeton Instruments).
4：Experimental Procedures and Operational Workflow:
The setup was calibrated using a standard of spectral irradiance. Micro-PL/re?ectance imaging and spectroscopy were performed with an inverted optical microscope (Olympus IX-71).
5：1).
Data Analysis Methods:
5. Data Analysis Methods: The spectral sensitivity of the apparatus was used to convert experimental spectra into spectral radiance. The correction for the IS-related PL background was applied based on the excitation peak ratio.
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