Figure 6 | Scientific Reports

Figure 6

From: Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems

Figure 6

CdS core (left), CdSe/CdS (right) raw materials of core/shell QDs (a), core/shell QRs (e) and core/crown NPLs (i) respectively. The QDs has an absorption peak at 620 nm (b), QRs at 621 nm (f) and NPLs at 554 nm (j). The TEM image of each particles shows the QDs with a diameter of 5.94 nm ± 0.46 nm (c), the QRs, with a diameter of 5.87 nm ± 0.59 nm with length of 33.10 nm ± 2.84 nm (g) and the NPLs with a length of 38.1 nm ± 5.2 nm with width of 13.6 nm ± 2.1 nm (k). The NPLs have a thickness of only 5 monolayer (≈1.5 nm). In the schematic diagrams of QDs (c), QRs (g) and NPLs (k), the red structure represents CdSe core and yellow structure represents Cds shell/crown. The spin-coated films of QDs (d), QRs (h) and NPLs (l) are about 150–190 nm thick.

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