Jacopo Pedrini

Università degli Studi di Milano-Bicocca | UNIMIB · Department of Materials Science

The latest trend in solar cell technology is to develop photon managing processes that adapt the solar emission to the spectral range at which the devices show the largest intrinsic efficiency. Triplet–triplet annihilation-assisted photon upconversion (sTTA-UC) is currently the most promising process to blue-shift sub-bandgap photons at solar irrad...

Intracellular pH is a key parameter in many biological mechanisms and cell metabolism and is used to detect and monitor cancer formation and brain or heart diseases. pH-sensing is typically performed by fluorescence microscopy using pH-responsive dyes. Accuracy is limited by the need for quantifying the absolute emission intensity in living biologi...

Long-life excimer-like structures Metal quantum clusters have ideal properties for medical applications such as imaging. The challenge is to prolong their transient properties for the fabrication of useful devices. Santiago-Gonzalez et al. arranged gold clusters in a supramolecular lattice held together by hydrogen bonding and showed that this mate...

The photon upconversion based on triplet–triplet annihilation (TTA) is a mechanism that converts the absorbed low-energy electromagnetic radiation into higher energy photons also at extremely low excitation intensities, but its use in actual technologies is still hindered by the limited availability of efficient annihilator moieties. We present her...

The conversion of low‐energy light into photons of higher energy based on sensitized triplet–triplet annihilation (sTTA) upconversion is emerging as the most promising wavelength‐shifting methodology because it operates efficiently at excitation powers as low as the solar irradiance. However, the production of solid‐state upconverters suited for di...

Photon up-conversion based on triplet-triplet annihilation (TTA) exploits the annihilation of optically dark triplets of an organic emitter to produce high-energy singlets that generate the high energy emission. In recently proposed hybrid systems, the annihilating triplets are indirectly sensitized by light-harvesting semiconductor colloidal nanoc...

Materials for nanophotonic devices ideally combine ease of deposition, very high refractive index, and facile pattern formation through lithographic templating and/or etching. In this work, we present a scalable method for producing high refractive index WS2 layers by chemical conversion of WO3 synthesized via atomic layer deposition (ALD). These c...

In triplet-triplet annihilation based upconversion, high-energy photons are generated through the annihilation of fluorophores triplets, populated via energy transfer from a light-harvesting sensitizer. However, the absorption band of common sensitizers is narrow, limiting the fraction of recoverable photons. We overcome this issue using a third ch...

Up-conversion (UC) of low-energy photons into high-energy light can in principle increase the efficiency of solar devices by converting photons with energies below the energy absorption threshold into radiation that can be utilized. Among up-conversion mechanisms, the sensitized triplet-triplet annihilation based up-conversion (sTTA-UC) is the most...

Lead halide perovskite nanocrystals (NCs) are emerging as optically-active materials for solution-processed optoelectronic devices. Despite the technological relevance of tracing rational guidelines for optimizing their performances and stability beyond their intrinsic resilience to structural imperfections, no in-depth study of the role of selecti...

As demonstrated by F. Meinardi, L. Beverina, and co-workers with 3T3 cells under a standard aerated environment on page 8447, sensitized triplettriplet annihilation based photon up-conversion greatly improves the scope and applicability of fluorescence bioimaging. Anti-Stokes detection at low powers eliminates background autofluorescence and limits...

A crucial limit of solar devices is their inability to harvest the full solar spectrum. Currently, sensitized up-conversion based on triplet-tripled annihilation (STTA-UC) in bi-component organic systems is the most promising technique to recover sub-bandgap photons, showing good efficiencies also at excitation intensities comparable to the solar i...

Sensitized triplet–triplet annihilation based photon up-conversion (TTA-UC) greatly improves the scope and applicability of fluorescence bioimaging by enabling anti-Stokes detection at low powers, thus eliminating the background autofluorescence and limiting the potential damage of the living tissues. Here the authors present a facile, one-step pro...

Metal quantum clusters have ideal properties for medical applications such as imaging. The challenge is to prolong their transient properties for the fabrication of useful devices. Santiago-Gonzalez et al. arranged gold clusters in a supramolecular lattice held together by hydrogen bonding and showed that this material can be used for imaging of fi...

The technological application of the sensitized up-conversion based on triplet-triplet annihilation (TTA) requires the transition from systems operating in liquid solutions to solid-state materials. Here, we demonstrate that the high up-conversion efficiency reported in hyper-cross-linked nanoparticles does not originate from a residual mobility of...