Emission Properties of Fluorescent Nanoparticles Determined by Their Optical Environment

Chung, Kelvin; Tomljenovic‐Hanic, Snjezana

doi:10.3390/nano5020895

Cited by 10 publications

(10 citation statements)

References 20 publications

(33 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the OM surrounding the biogenic SeNPs, as well as L-cysteine residues present on chemogenic SeNPs, might influence their PL emission rate. Indeed, approximating SeNPs suspended in water to encapsulated oscillating dipoles [80], and considering the refractive index (n) of Se in the visible range (532 nm; arbitrary fixed) to be n Se = 3.0, the large difference between the water refractive index (n w = 1.33) and n Se would result in a modest (or even close to zero) PL emission for bare NPs, as most of the light would be trapped inside the NPs themselves [16,80]. This limited PL emission is usually compensated by using polymers with n w < n p < n Se as a coating for NPs, which simultaneously provide steric hindrance for their thermodynamic stabilization [2] and decrease the refractive index difference between NPs and water [16,80].…”

Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 99%

“…Indeed, approximating SeNPs suspended in water to encapsulated oscillating dipoles [80], and considering the refractive index (n) of Se in the visible range (532 nm; arbitrary fixed) to be n Se = 3.0, the large difference between the water refractive index (n w = 1.33) and n Se would result in a modest (or even close to zero) PL emission for bare NPs, as most of the light would be trapped inside the NPs themselves [16,80]. This limited PL emission is usually compensated by using polymers with n w < n p < n Se as a coating for NPs, which simultaneously provide steric hindrance for their thermodynamic stabilization [2] and decrease the refractive index difference between NPs and water [16,80]. PL emission of SeNPs can be also promoted by their chemical interaction with the biomolecules of the OM (proteins, lipids, and carbohydrates) [6,57] or L-cysteine residues, determining, for instance, the generation of dipole-dipole or ionic-dipole interactions between biomolecular functional groups e.g., amine or thiol groupsand Se at the NP surface [81].…”

Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 99%

See 1 more Smart Citation

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

et al. 2020

View full text Add to dashboard Cite

AbstractVarious technological and biomedical applications rely on the ability of materials to emit light (photoluminescence [PL]), and, among them, metal nanoparticles (NPs) and semi-conductor Quantum Dots (QDs) represent ideal candidates as sensing probes and imaging tools, portraying better PL features than conventional organic dyes. However, the knowledge of PL behavior of semiconductor NPs – i.e., selenium; SeNPs – is still in its infancy, especially for those synthesized by microorganisms. Considering the essential role played by biogenic SeNPs as antimicrobial, anticancer, and antioxidant agents, or food supplements, their PL properties must be explored to take full advantage of them as eco-friendly and versatile tools. Here, PL features of SeNPs produced by the Se-tolerant Stenotrophomonas maltophilia SeITE02 strain, compared with chemogenic ones, are investigated, highlighting the PL dependency on the NP size. Indeed, PL emission shifted from indigo-blue (emission wavelength λem 400–450 nm) to green-yellow (λem 480–570 nm) and orange-red (λem 580–700 nm) for small (ca. 50 nm) and big (ca. 100 nm) SeNPs respectively, revealing the versatility of an environmental bacterial isolate to synthesize diverse PL probes. Besides, biogenic SeNPs show PL lifetime comparable to those of the most used fluorophores, supporting their potential application as markers for (bio)imaging.

show abstract

Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 99%

Section: Photoluminescence Properties and Lifetime Measurements Of Bimentioning

confidence: 99%

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This has been explored for dipole emission within an NP in a generalised refractive index distribution [57] and experimentally tested with PMMA coatings of a nanodiamond, containing single emitters, on a Si substrate [58]. Furthermore, the removal and redeposition onto a Si substrate compromises the ability to address the same emitters.…”

Section: Optical Characterisation Of Zno Nps Deposited On a Silicon Smentioning

confidence: 99%

Room-temperature single-photon emission from zinc oxide nanoparticle defects and their in vitro photostable intrinsic fluorescence

et al. 2016

Self Cite

View full text Add to dashboard Cite

Zinc oxide (ZnO) is a promising semiconductor that is suitable for bioimaging applications due to its intrinsic defect fluorescence. However, ZnO generally suffers from poor photostability. We report room-temperature single-photon emission from optical defects found in ZnO nanoparticles (NPs) formed by ion implantation followed by thermal oxidation in a silica substrate. We conduct a thorough investigation into the photophysics of a particularly bright defect and identify other single emitters within the NPs. Photostability was observed when the NPs were removed from the growth substrate and taken up by skin cells for in vitro imaging.

show abstract

“…To verify this hypothesis, Tb 3+ /PET-TEG/Phen with different concentrations was prepared in DMF from 0.002 mol/L to 0.01 mol/L to investigate the fluorescence behaviour. It can be seen that there are four fluorescence emission peaks [31], with the strongest fluorescence emission peak being the 5 D 4 -7 F 5 transition. With the increasing concentration, the fluorescence intensity increased.…”

Section: Characterization Of Fluorescence Propertiesmentioning

confidence: 99%

Fluorescent SiO2@Tb3+(PET-TEG)3Phen Hybrids as Nucleating Additive for Enhancement of Crystallinity of PET

Zhang¹,

Wang²,

Li³

et al. 2020

Polymers

View full text Add to dashboard Cite

A hybrid polymer of SiO2@Tb3+(poly(ethylene terephthalate)-tetraglycol)3 phenanthroline (SiO2@Tb3+(PET–TEG)3Phen) was synthesized by mixing of inorganic SiO2 nanoparticles with polymeric segments of PET–TEG, whereas PET–TEG was achieved through multi-step functionalization strategy. Tb3+ ions and β-diketonate ligand Phen were added in resulting material. The experimental results demonstrated that it was well blended with PET as a robust additive, and not only promoted the crystallinity, but also possessed excellent luminescence properties. An investigation of the mechanism revealed that the SiO2 nanoparticles functioned as a crystallization promotor; the Tb3+ acted as the fluorescent centre; and the PET–TEG segments played the role of linker and buffer, providing better compatibility of PET matrix with the inorganic component. This work demonstrated that hybrid polymers are appealing as multifunctional additives in the polymer processing and polymer luminescence field.

show abstract

Emission Properties of Fluorescent Nanoparticles Determined by Their Optical Environment

Cited by 10 publications

References 20 publications

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

Tunable photoluminescence properties of selenium nanoparticles: biogenic versus chemogenic synthesis

Room-temperature single-photon emission from zinc oxide nanoparticle defects and their in vitro photostable intrinsic fluorescence

Fluorescent SiO2@Tb3+(PET-TEG)3Phen Hybrids as Nucleating Additive for Enhancement of Crystallinity of PET

Contact Info

Product

Resources

About