Journal
ACS OMEGA
Volume 5, Issue 41, Pages 26537-26544Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c03252
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Funding
- Polish National Science Center (FUGA5 Project) [UMO-2016/20/S/ST3/00277]
- Czech Science Foundation [19-00676S]
- RECOOP HST Association
- Cedars-Sinai Medical Center
- Ministry of Education, Youth and Sports [8JPL19006]
- Polish National Agency for Academic Exchange
- Polish National Science Center (Sonata Bis 3 Project) [UMO-2013/10/E/ST5/00651]
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Development of upconverting nanomaterials which are able to emit visible light upon near-infrared excitation opens a wide range of potential applications. Because of their remarkable photostability, they are widely used in bioimaging, optogenetics, and optoelectronics. In this work, we demonstrate the influence of several experimental conditions as well as a dopant concentration on the luminescence properties of upconverting nanocrystals (UPNCs) that need to be taken into account for their efficient use in the practical applications. We found that not only nanoparticle architecture affects the optical properties of UPNCs, but also factors such as sample concentration, excitation light power density, and temperature may influence the green-to-red emission ratio. We performed studies on both the single-nanoparticle and ensemble levels over a broad concentration range and found the heterogeneity in the optical properties of UPNCs with low dopant concentrations.
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