| Solution processed colloidal semiconductor quantum dots(QDs)have high quantum efficiencies and size tunable optical transitions,enabling various applications in optoelectronic devices.To enrich the functionality of QD-based opto-electronic devices,colloidal semiconductor QDs have been frequently coupled with optical cavities to enable emission modulation.However,it is still challenging to fully understand the interaction between the optical cavity resonance and the QD emission,especially for the planar optical microcavities.Here,we have investigated the light emission of colloidal semiconductor QDs in the planar Fabry-Perot microcavity consisted of two Ag mirrors.Our work highlights the important role of detuning as well as the microcavity quality factor in determining the coupling between colloidal semiconductor QDs and microcavities,and addresses the patterning of planar microcavity samples,paving the way for future design of microcavity coupled QD devices.Specifically,the main research contents of this thesis include:1.First,we study the modulation of QD luminescence by energy detuning.With matched QD and cavity resonances,the microcavity-coupled QD samples show significantly narrower emission linewidths and emission angular ranges due to efficient QD-cavity coupling.The linewidth and angular distribution of the microcavity-coupled QD emission are broadened with slight positive or negative energy detuning.2.By electron beam lithography,we then realized the planar patterning of the microcavity coupled QD sample,and its spectrum showed the in-plane resonant mode.3.At the same energy detuning,the microcavity-coupled QD samples show extra modulation with the further improved quality factor of the microcavity by changing the spin coating process.With higher quality factors,the microcavity-coupled QD samples show further narrowed linewidth and emission angle range.In the case of positive energy detuning,the spectrum can be further modulated into multiple peaks. |
PDF Full Text Request