期刊
NANO LETTERS
卷 20, 期 10, 页码 7648-7654出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03187
关键词
near-infrared; downshifting; quantum yield; lanthanide-doped nanoparticles; neodymium
类别
资金
- Fonds de Recherche du Que'bec-Nature et technologies (FRQNT)
- European Commission from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska Curie grant [709270]
- projects CICECO-Aveiro Institute of Materials [UIDB/50011/2020, UIDP/50011/2020]
- FCT/MEC [POCI-01-0145-FEDER-031469]
- FEDER under the PT2020 Partnership Agreement
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Discovery Accelerator Supplement (DAS) award
- Canada Foundation for Innovation
- FRQNT
- Ministerio de Ciencia e Innovacio'n of Spain (MICIIN) under the National Program of Sciences and Technological Materials [MAT2016-75586-C4-4-P, PID2019-106383GB-C44, PID2019-107335RA-I00]
- EU-FEDER funds
- Marie Curie Actions (MSCA) [709270] Funding Source: Marie Curie Actions (MSCA)
Lanthanide-doped nanoparticles (LnNPs) are versatile near-infrared (NIR) emitting nanoprobes that have led to their growing interest for use in biomedicine-related imaging. Toward the brightest LnNPs, high photoluminescence quantum yield (PLQY) values are attained by implementing core/shell engineering, particularly with an optically inert shell. In this work, a thorough investigation is performed to quantify how an outer inert shell maintains the PLQY of Nd3+-doped LnNPs dispersed in an aqueous environment. Three relevant quantitative findings affecting the PLQY of Nd3+-doped LnNPs are identified: (i) the PLQY of core LnNPs is improved 3-fold upon inert shell coating; (ii) PLQY decreases with increasing Nd3+ doping despite the inert shell; and (iii) solvent quenching has a major influence on the PLQY of the LnNPs, though it is relatively lessened for high Nd3+ doping. Overall, we shed new light on the impact of the LnNP architecture on the NIR emission, as well as on the quenching effects caused by doping concentration and solvent molecules.
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