Themed collection Editor’s Choice: Progress in singlet fission and photon upconversion
Enhancing the intermolecular singlet fission efficiency by controlling the self-assembly of amphipathic tetracene derivatives in aqueous solution
Introduction of the carboxyl group onto tetracene can change the singlet fission mechanism and increase the singlet fission yield in its nanoparticles.
An add-on organic green-to-blue photon-upconversion layer for organic light emitting diodes
Deep-blue emission from a green OLED is obtained by adding a thin gelled upconversion layer and additional dichroic filters.
Color tunable upconversion luminescent perovskite fluoride with long-/short-lived emissions toward multiple anti-counterfeiting
A color-tunable UC luminescent perovskite fluoride KCdF3:Yb3+,Mn2+,Ln3+ with both long and short emission lifetimes has been demonstrated, showing high potential for multiple anti-counterfeiting with high throughput authentication rate.
Highly sensitive optical ratiometric thermal sensing based on the three-photon upconversion luminescence of Y2O3:Yb3+,Er3+ nano-thermometers
The highest relative thermal sensitivity for Er3+-based thermometers is reported following 980 nm laser excitation.
Measurement of the triplet exciton diffusion length in organic semiconductors
We develop a methodology to measure the diffusion of dark triplet excitons in organic semiconductor thin films using a phosphorescent sensitizer-based approach that explicitly quantifies quenching efficiency by varying sensitizer concentration.
Impact of molecular conformation on triplet-fusion induced photon energy up-conversion in the absence of exothermic triplet energy transfer
Control over the brightness of photon energy up-conversion luminescence is gained by tuning the molecular conformation of the emitter species.
Dual-mode color tuning based on upconversion core/triple-shell nanostructure
Temperature/power dual-mode color manipulation is achieved in an upconversion core/triple-shell nanostructure.
Trap-induced conversion from singlet fission to intersystem crossing via in situ heating of rubrene-based organic light-emitting diodes
An in situ heating method was used to investigate the effect of high temperature on the magneto-electroluminescence (MEL) of rubrene-based organic light-emitting diodes.
Growth, morphology and structure of mixed pentacene films
This work investigates the evolution of structure and morphology of pure and co-evaporated thin films, as a function of pentacene concentration in a solid host of p-terphenyl.
A novel strategy for markedly enhancing the red upconversion emission in Er3+/Tm3+ cooperated nanoparticles
A novel core–shell structured nanocrystal with energy trapping centers of Tm3+ ions doped in the Er3+-hosted core zone and Yb3+ ions doped in the shell portion is innovated to achieve super-bright red upconversion emission upon low 980 nm laser excitation.
Optimization of energy transfer in a polymer composite with perylene chromophores
Luminescent solar concentrators based on molecular dyes are a promising approach to light collection.
Pure red upconversion luminescence and optical thermometry of Er3+ doped sensitizer-rich SrYbInO4 phosphors
The structure, upconversion luminescence properties and optical thermometry application of Er3+ doped sensitizer-rich SrYbInO4 phosphors have been investigated.
Aggregation-free sensitizer dispersion in rigid ionic crystals for efficient solid-state photon upconversion and demonstration of defect effects
Accommodation of ionic sensitizers into emitter ionic crystals allows aggregation-free sensitizer dispersion and efficient photon upconversion.
Confining excitation energy of Er3+-sensitized upconversion nanoparticles through introducing various energy trapping centers
Various energy trapping centers are employed to simultaneously suppress concentration quenching and tune luminescence output through efficiently confining the excitation energy in Er3+-sensitized upconversion nanoparticles.
Singlet exciton fission in a linear tetracene tetramer
Efficient iSF was achieved within this tetracene tetramer with the triplet state quantum yield as high as 128% and a lifetime >100 μs in solution.
About this collection
This first in a series of Journal of Materials Chemistry C Editor’s Choice collections focusses on progress in singlet fission and photon upconversion.
Journal of Material Chemistry C’s Associate Editor Kasper Moth-Poulsen (Chalmers University of Technology, Sweden) introduces this Journal of Materials Chemistry C Editor’s Choice collection:
“Singlet fission and photon upconversion are two exciting photochemical processes. Singlet fission is the process of splitting one excited state into two exited triplets and charge carrier states. Photon upconversion combines two low energy photons into one high energy photon.
Both processes have the potential to enhance the efficiency of solar-driven photochemical process radically and e.g., increase the energy efficiency beyond the Shockley-Queisser limit from ≈ 33%¹ found in single-junction solar cells to 42%² and 51%³, respectively. Several other applications are explored where photons that are lower in energy than the active molecule’s absorption onset are used to drive photochemical processes. These include exciting new developments in bioimaging,4 photodynamic therapy5 and photoredox catalysis.6
Here, I have selected a series of papers published during recent years in Journal of Materials Chemistry C on the topics of singlet fission and photon upconversion, following both the molecular and rare-earth nanoparticle-based upconversion schemes.”
1) Shockley, W.; Queisser, H. J., J Appl Phys 1961,32, 510-519.
2) M. C. Hanna, A. J. Nozik, J. of App. Phys. 2006, 100, 074510.
3) T. Trupke, A. Shalav, B. S. Richards, P. Wurfel, M. A. Green, Solar Energy Mat. Solar Cells 2006, 90, 3327-3338.
4) Liu Q, Yang T, Feng W, Li F, J. Am. Chem. Soc 2012, 134, 5390
5) Askes SHC, Kloz M, Bruylants G, Kennis JTM, Bonnet S, Phys. Chem. Chem. Phys 2015, 17, 27380
6) Ravetz, B. D.; Pun, A. B.; Churchill, E. M.; Congreve, D. N.; Rovis, T.; Campos, L. M., Nature 2019,565, 343-346