Why do Si quantum dots with stronger fast emission have lower external photoluminescence quantum yield?

0585820 - FZÚ 2025 RIV GB eng J - Journal Article
Popelář, Tomáš - Matějka, Filip - Kopenec, Jakub - Morselli, G. - Ceroni, P. - Kůsová, Kateřina
Why do Si quantum dots with stronger fast emission have lower external photoluminescence quantum yield?
Nanoscale Advances. Roč. 6, č. 10 (2024), s. 2644-2655. ISSN 2516-0230. E-ISSN 2516-0230
R&D Projects: GA ČR(CZ) GA23-05837S
Institutional support: RVO:68378271
Keywords : silicon quantum dots * fast emission * photoluminescence dynamics * quantum yield
OECD category: Nano-materials (production and properties)
Impact factor: 4.7, year: 2022
Method of publishing: Open access

In this publication, we quantitatively determine the ratio of fast blue and slow red photoluminescence in silicon quantum dots. We present an observation that silicon quantum dots with relatively higher fast blue photoluminescence component systematically exhibit lower external photoluminescence quantum. We explain this trend as an inherent property of the system, by presenting a model of the optical performance of an ensemble of quantum dots with widely varying optical characteristics.
Permanent Link: https://hdl.handle.net/11104/0353492