研究目的
Investigating the relationship between the upconversion luminescence and the shell thickness of Er3+:NaYF4-NaLuF4 UCNCs in their monolayer configuration, and enhancing the UCL yield by introducing resonant Au-nanodiscs.
研究成果
The study demonstrated that the decay times of the first two excited states of Er3+ ions were essentially uninfluenced in the transition of colloidal solutions to 2D-arrangements of the UCNCs, excluding the possible opening of non-radiative decay channels. The UCL yield was further enhanced by introducing EBL-defined resonant Au-nanodiscs, with the improvement by the nanocrystal shells being greater than that of the Au-nanodiscs.
研究不足
The study notes that the absolute value of quantum yields (QY) of the UCNCs are lower for several reasons including the measurement of external QY instead of internal QY, the experiment being performed only with Er3+ ions, lower dopant concentration, and measurement for monolayers instead of concentrated colloidal solutions.
1：Experimental Design and Method Selection:
The study involved the fabrication of spin-cast self-assembled monolayers of Er3+:NaYF4-NaLuF4 (core-shell) UCNCs and the investigation of their upconversion luminescence dependence on shell thickness.
2：Sample Selection and Data Sources:
Nearly spherical,
3：7 ± 7 nm diameter 20 mol% Er3+-doped β-NaYF4 core nanocrystals were chemically fabricated, with a variety of NaLuF4 shells. List of Experimental Equipment and Materials:
High-resolution transmission electron microscope (HR-TEM), scanning electron micrographs (SEMs), spectrophotometer, spectrograph, pulsed Ti:sapphire laser.
4：Experimental Procedures and Operational Workflow:
Monolayers were developed by a drop-cast-assisted spin coating technique. Optical investigations included steady-state UCL measurements and time-resolved PL measurements.
5：Data Analysis Methods:
The decay curves were fitted to either a single-exponential decay or single-exponential decay with an initial exponential rise factor.
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