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Themed collection Metal Complexes and Nanoparticles for Energy Upconversion

20 items
Editorial

Metal complexes and nanoparticles for energy upconversion

Welcome to this issue of Dalton Transactions featuring the themed issue “Metal complexes and nanoparticles for energy upconversion”.

Graphical abstract: Metal complexes and nanoparticles for energy upconversion
Perspective

Molecular-based upconversion in homo/heterogeneous liquids and in micro/nanostructured solid materials

A step-by-step investigation to move TTA-UC from homogeneous solutions to nanostructured solid materials for new technological perspectives.

Graphical abstract: Molecular-based upconversion in homo/heterogeneous liquids and in micro/nanostructured solid materials
Perspective

Using lead chalcogenide nanocrystals as spin mixers: a perspective on near-infrared-to-visible upconversion

This perspective highlights recent advances in the field of PbS NC-sensitized near-infrared-to-visible upconversion based on triplet–triplet annihilation in rubrene.

Graphical abstract: Using lead chalcogenide nanocrystals as spin mixers: a perspective on near-infrared-to-visible upconversion
Perspective

Current progress in the controlled synthesis and biomedical applications of ultrasmall (<10 nm) NaREF4 nanoparticles

This review primarily introduces new progress in preparation strategies of ultrasmall (<10 nm) NaREF4 upconversion nanoparticles, and their use in imaging and drug delivery.

Graphical abstract: Current progress in the controlled synthesis and biomedical applications of ultrasmall (<10 nm) NaREF4 nanoparticles
Perspective

Near infrared harvesting dye-sensitized solar cells enabled by rare-earth upconversion materials

Dye-sensitized solar cells (DSSCs) have been deemed as promising alternatives to silicon solar cells for the conversion of clean sunlight energy into electricity.

Graphical abstract: Near infrared harvesting dye-sensitized solar cells enabled by rare-earth upconversion materials
Perspective

Prospects for efficient solar energy upconversion using metalloporphyrins as dual absorber-upconverters

Can metalloporphyrins be used in a dual absorber-upconverter capacity to improve photovoltaic efficiency?

Graphical abstract: Prospects for efficient solar energy upconversion using metalloporphyrins as dual absorber-upconverters
Frontier

Upconversion in photodynamic therapy: plumbing the depths

Upconversion photodynamic therapy uses sequential multiphoton absorption by transition metal nanoparticles (NaYF4/Yb3+/Er3+) to allow FRET excitation of traditional visible light-absorbing photosensitizers by deeply penetrating near infrared light (810 nm or 980 nm).

Graphical abstract: Upconversion in photodynamic therapy: plumbing the depths
Frontier

Bringing upconversion down to the molecular scale

After bulk solids and nanoparticles, examples of upconversion are now emerging at the discrete molecular scale in solution.

Graphical abstract: Bringing upconversion down to the molecular scale
Communication

Hybridizing semiconductor nanocrystals with metal–organic frameworks for visible and near-infrared photon upconversion

Solid upconverters consisting of semiconductor nanocrystals and metal–organic frameworks (MOFs) show NIR-to-visible TTA-UC with large anti-stokes shifts.

Graphical abstract: Hybridizing semiconductor nanocrystals with metal–organic frameworks for visible and near-infrared photon upconversion
Communication

Yb3+-sensitized upconversion and downshifting luminescence in Nd3+ ions through energy migration

A core–shell–shell nanostructure composed of NaGdF4:Yb/Tm@NaGdF4:Nd@NaYF4 is developed to realize Yb3+-sensitized upconversion and downshifting luminescence in Nd3+ ions.

Graphical abstract: Yb3+-sensitized upconversion and downshifting luminescence in Nd3+ ions through energy migration
Communication

Exploiting coumarin-6 as ancillary ligands in 1,10-phenanthroline Ir(III) complexes: generating triplet photosensitisers with high upconversion capabilities

A series of new Ir(III) complexes incorporating 3-(2-benzothiazolyl)-7-(diethylamino)coumarin (coumarin 6) and ethynylpyrene (EP) functionalised 1,10-phenanthroline (phen) were developed.

Graphical abstract: Exploiting coumarin-6 as ancillary ligands in 1,10-phenanthroline Ir(iii) complexes: generating triplet photosensitisers with high upconversion capabilities
Paper

Fabrication of single-chain nanoparticles through the dimerization of pendant anthracene groups via photochemical upconversion

Visible light is used to drive the intramolecular dimerization of anthracenes on a methacrylic polymer to form single-chain nanoparticles.

Graphical abstract: Fabrication of single-chain nanoparticles through the dimerization of pendant anthracene groups via photochemical upconversion
Paper

A temperature sensor based on the enhanced upconversion luminescence of Li+ doped NaLuF4:Yb3+,Tm3+/Er3+ nano/microcrystals

In this paper, fluorescent and optical temperature sensing bi-functional Li+-doping NaLuF4:Ln (Ln = Yb3+,Tm3+/Er3+) nanocrystals were synthesized via a simple hydrothermal method using oleic acid as a capping ligand.

Graphical abstract: A temperature sensor based on the enhanced upconversion luminescence of Li+ doped NaLuF4:Yb3+,Tm3+/Er3+ nano/microcrystals
Paper

Facile preparation of multifunctionalisable ‘stealth’ upconverting nanoparticles for biomedical applications

Hide and Seek. Alendronate-modified upconverting nanoparticles display high colloidal stability, protein corona resistance, bright upconversion luminescence (800 nm excitation), and contain multifunctionalisation sites.

Graphical abstract: Facile preparation of multifunctionalisable ‘stealth’ upconverting nanoparticles for biomedical applications
Paper

Up-conversion monodispersed spheres of NaYF4:Yb3+/Er3+: green and red emission tailoring mediated by heating temperature, and greatly enhanced luminescence by Mn2+ doping

Mn2+ doping resulted in greatly enhanced luminescent intensity and red shift of emission color. Elevating the temperature induced color tunable emission.

Graphical abstract: Up-conversion monodispersed spheres of NaYF4:Yb3+/Er3+: green and red emission tailoring mediated by heating temperature, and greatly enhanced luminescence by Mn2+ doping
Paper

Plasmon-enhanced triplet–triplet annihilation upconversion of post-modified polymeric acceptors

Plasmonic enhancement of TTA-UC is demonstrated on an easily adaptable polymer platform containing silver nanoparticles and various covalently attached chromophores.

Graphical abstract: Plasmon-enhanced triplet–triplet annihilation upconversion of post-modified polymeric acceptors
Paper

Exploiting the benefit of S0 → T1 excitation in triplet–triplet annihilation upconversion to attain large anti-stokes shifts: tuning the triplet state lifetime of a tris(2,2′-bipyridine) osmium(II) complex

The triplet state lifetime of an Os(bpy)3 complex showing strong S0 → T1 absorption was prolonged 30-fold by attaching Bodipy chromophores.

Graphical abstract: Exploiting the benefit of S0 → T1 excitation in triplet–triplet annihilation upconversion to attain large anti-stokes shifts: tuning the triplet state lifetime of a tris(2,2′-bipyridine) osmium(ii) complex
Paper

Controllable synthesis of lanthanide Yb3+ and Er3+ co-doped AWO4 (A = Ca, Sr, Ba) micro-structured materials: phase, morphology and up-conversion luminescence enhancement

The combination of CDs can mainly maintain the morphologies of AWO4:Yb3+,Er3+ but prominently increase their up-conversion luminescence performance.

Graphical abstract: Controllable synthesis of lanthanide Yb3+ and Er3+ co-doped AWO4 (A = Ca, Sr, Ba) micro-structured materials: phase, morphology and up-conversion luminescence enhancement
Open Access Paper

Stimuli-responsive protection of optically excited triplet ensembles against deactivation by molecular oxygen

The temperature-responsive protection of optically created organic triplet ensembles against deactivation by molecular oxygen was realized.

Graphical abstract: Stimuli-responsive protection of optically excited triplet ensembles against deactivation by molecular oxygen
Paper

NIR/blue light emission optimization of NaY1−(x+y)YbxF4:Tmy upconversion nanoparticles via Yb3+/Tm3+ dopant balancing

A data driven approach provides better understanding of the role of dopant balancing in the upconversion process and presents an effective strategy to enhance the optical properties of upconversion nanoparticles.

Graphical abstract: NIR/blue light emission optimization of NaY1−(x+y)YbxF4:Tmy upconversion nanoparticles via Yb3+/Tm3+ dopant balancing
20 items

About this collection

Energy upconversion is the process in which a high energy excited state is populated upon the absorption of two or more photons of lower energy. This themed issue gathers the most recent and significant advances in upconversion systems based on energy transfer between lanthanide ions or sensitised triplet–triplet annihilation and explores possible applications across a broad range of fields including photovoltaic devices, photocatalysis, sensing, bioimaging and photodynamic therapy.

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