Interparticle Spacing Effect among Quantum Dots with High-Pressure Regulation.

In this paper, we explore whether interparticle spacing affects steady-state and transient-state optical properties by comparing close-packed CdSe/ZnS-quantum dots (QDs) and CdSe/ZnS-QDs dispersed in polymethyl methacrylate (PMMA). High-pressure is an effective physical means to adjust the interparticle spacing of QDs, which may artificially expand the application of QDs further. The results under high-pressure indicate that it is the reduced interparticle spacing rather than the enhanced quantum confinement effect with volume compression that has a stronger effect on exciton relaxation of CdSe/ZnS-QDs. This work is hoped to help us further understand the effect of interparticle spacing among QDs in various integrated environments.