期刊
ACS NANO
卷 9, 期 4, 页码 3942-3950出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn507310f
关键词
quantum dot; nanocrystal; assembly; quantum dot solid; multiexciton emission; whispering gallery mode; Auger recombination
类别
资金
- NanoNextNL, a micro- and nanotechnology consortium of the Government of The Netherlands
- European Research Council under the European Union [291667]
- European Research Council (ERC) [291667] Funding Source: European Research Council (ERC)
Semiconductors are indispensable as the active light-emitting element in many optoelectronic devices. However, even the purest bulk semiconductors suffer from considerable nonradiative recombination leading to low photoluminescence efficiencies. Zero-dimensional quantum dots show a much better carrier-to-photon conversion caused by confinement of the excitons but suffer from nonradiative recombination when assembled into a solid, due to exciton energy transfer. Here, we report on the shape-dependent optical properties of self-assembled supraparticles composed of CdSe/multishell nanocrystals. All supraparticles show stable and bright photoluminescence in ambient up to high excitation intensities. When the supraparticles are deposited on a silicon surface their spherical shape is deformed due to drying. In addition to single-exciton emission, we observe bright emission from multiexciton states at high excitation powers. In contrast, supraparticles that retain their perfectly spherical shape show a spectrum with sharp Mie whispering gallery modes, while multiexciton emission is absent.
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