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(a) TEM image of as-prepared CdSe/CdS/ZnS core-shell NQDs (scale bar: 50 nm). Inset shows the high resolution image of an individual NQD; (b) SEM image of a silica microbead (scale bar: ) with a closeup view showing the porous morphology (scale bar: ). (c) PL image of the dispersed microbeads (scale bar: ). Inset shows the image of WGM lasing of a single microbead (scale bar: ).
(a) TPP emission spectra recorded from an individual microbead at different excitation fluence. (b) Peak intensity is plotted as a function of the quadratic of excitation fluence. (c) Time-resolved PL traces with excitation fluence below (SPE) and above (Lasing) the lasing threshold.
Shot-dependent lasing intensity of a NQD-doped microbead and ASE from a NQD thin film. Data were recorded with the excitation fluence twice of the thresholds.
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