Themed collection Singlet fission and photon upconversion

Upconversion photoluminescence is a nonlinear effect where multiple lower energy excitation photons produce higher energy emission photons.

A method for video-rate display with optimized single UCNP brightness by integrating the full emission intensity over excitation time and lifetime.

Nanocomposite NaYF₄:Nd,Yb@Yb@Yb,Er@Y with Nd³⁺ in the core and Er³⁺ in the shell to shorten the emitter (Er³⁺)–photosensitizer distance to achieve better Förster resonance energy transfer (FRET) for better-performing photo-nanotheranostic materials.

Phonon-assisted single-photon upconversion was first discovered in a new 6-pentaceneone crystal, which can be mechanically exfoliated layer by layer.

Convenient design of fully Yb-based upconversion nanoparticles enables control of their luminescence characteristics and enhances super-resolution imaging performance.

We resolve a long standing discrepancy between various reports on the effect of the magnetic field on up-converted luminescence.

In light of recent developments on Yb³⁺-based upconverting rare-earth nanoparticles (RENPs), we have systematically explored the spectral features of LiYbF₄:RE³⁺/LiYF₄ core/shell RENPs doped with various amounts of Tm³⁺, Er³⁺, or Ho³⁺.

A photovoltaic system that combines photon upconversion-assisted luminescence solar concentrators and perovskite solar cells is demonstrated.

Streptavidin-PEG-neridronate-UCNP nanoconjugates enable the specific detection of tumor markers on the surface of cancer cells with outstanding signal-to-background ratio.

We demonstrated for the first time low-threshold whispering-gallery mode upconversion lasing through five-photon absorption enhanced by on-chip microcavities at room temperature.

Quantitative intramolecular FRET from a porphyrazine to pentacene enhances singlet fission with triplet quantum yields up to 200% ± 20% in benzonitrile.

Microlens arrays are applied as spatial light modulators to manipulate the distribution of excitation light fields in order to overcome the high excitation-intensity threshold of upconversion nanoparticles, taking advantage of their nonlinear response to excitation irradiance.

Exceptional enhancement in both upconversion and downconversion near-infrared emission has been realized in the developed ferroelectric photonic nanocomposite.

Coating with an inert shell is considered an efficient approach for enhancing the emission and improving the luminescence quantum yield of lanthanide-doped upconversion nanoparticles.

Upon photoexcitation, self-assembled PDI nanocrystals (S₁S₀) in the form of rods of 70 nm width and 1 μm length are subject to a symmetry breaking charge separation (SBCS) as the first step in the singlet fission (SF) sequence.

Feeling the plasmonic heat: the photothermal effect in gold nanostars enhances the emission intensity of small-size upconverting nanocrystals.

The interplay on enhancing and quenching effects between Er³⁺ and Yb³⁺ dopant clusters in self-sensitized core@shell nanoparticles is studied.

Photon management enables the manipulation of the number of input photons by conversion of two or more light quanta into one (upconversion) or vice versa (quantum cutting).

The development of rare-earth doped upconversion nanoparticles (RE-UCNPs) in various applications is fuelling the demand for nanoparticles with highly enhanced upconversion luminescence (UCL).

A method is delineated for the management of nonlinear spectral profile and luminescence lifetime in upconversion nanoparticles by manipulating the energy distributors.