The performance of photovoltaic (PV) solar cells can be adversely affected by the heat generated from irradiation. To address this issue, a hybrid device featuring energy storage and cooling layer integrated with silicon-based PV cell has been developed. This employs molecular thermal (MOST) system to convert store high-energy photons—typically underutilized due thermalization losses—into chemical energy. Simultaneously, it effectively cools through both optical effects conductivity. Herein,...

Organic ultralong room temperature phosphorescence (RTP), or organic afterglow, is a unique phenomenon, gaining widespread attention due to its far-reaching application potential and fundamental interest. Here, two laterally expanded 9,10-dimesityl-dihydro-9,10-diboraanthracene (DBA) derivatives are demonstrated as excellent afterglow materials for red blue-green light emission, which traced back persistent thermally activated delayed fluorescence RTP. The lateral substitution of polycyclic...

In this work, we report on the synthesis and photophysical investigation of a new star-shaped triazine-carbazole derivative 2,4,6-tris(3-(3,6-di-tert-butyl-9H-carbazol-9-yl)phenyl)-1,3,5-triazine. Comparative study properties newly synthesized emitter along with its para-substituted isomer 2,4,6-tris(4-(3,6-di-tert-butyl-9H-carbazol-9-yl)phenyl)-1,3,5-triazine was performed. While para-linkage caused higher oscillator strength lowest energy absorption band high fluorescence quantum yield,...

Carrier mobility is one of the crucial parameters determining electronic device performance. We apply light-induced transient grating technique to measure independently carrier diffusion coefficient and lifetime, reveal impact additives on transport properties in wet-cast CH3NH3PbI3 (MAPbI3) perovskite films. use high excitation regime, where length carriers controlled purely by not lifetime. demonstrate a four-fold increase due reduction localization center density additives; however,...

Abstract Incoherent photon upconversion (UC) mediated by triplet‐triplet annihilation (TTA) offers multiple implementation pathways, from bio‐related applications to energy harvesting in photovoltaics. Despite its potential, TTA‐UC efficiency the near‐infrared (NIR) range is notably low, particularly solid‐state systems. Rubrene ( Rub ), a key annihilator this spectral range, faces significant concentration quenching, primarily due singlet fission (SF). To mitigate issue, herein, cyano (CN)...

Triplet-triplet annihilation photon upconversion (TTA-UC) systems hold great promise for applications in energy, 3D printing, and photopharmacology. However, their optimization remains challenging due to the need precise tuning of sensitizer annihilator concentrations under oxygen-free conditions. This study presents an automated, high-throughput platform discovery TTA-UC systems. Capable performing 100 concentration scans just two hours, generates comprehensive maps critical parameters,...

Singlet fission is detrimental to NIR-to-vis photon upconversion in the solid rubrene (Rub) films, as it diminishes photoluminescence efficiency. Previous studies have shown that thermally activated triplet energy transport drives singlet with nearly 100% efficiency closely packed Rub crystals. Here, we examine separation and recombination a function of intermolecular distance crystalline films t-butyl substituted (tBRub) derivative. The increased altered molecular packing tBRub cause...

Organic single crystals (SCs) expressing long-range periodicity and dense molecular packing are an attractive amplifying medium for the realization of electrically driven organic lasers. However, amplified spontaneous emission (ASE) threshold (1–10 kW/cm2) SCs is still significantly higher compared to those amorphous neat or doped films. The current study addresses this issue by investigating ASE properties rigid bridging group-containing bifluorene SCs. Introduction bridges in bifluorenes...

N,N'-disubstituted indigos are photoswitchable molecules that have recently caught the attention due to their addressability by red-light. When alkyl and aryl groups utilized as N-substituents, thermal half-lives of Z isomers can be tuned independently while maintaining advantageous red-shifted absorption spectra. To utilize these in real-world applications, it is immense importance understand how molecular structures well environment influence switching properties. this end, we probed...

Two new twisted intramolecular charge transfer (TICT) donor-π-acceptor compounds were designed by combining a well-known electron acceptor naphthalimide unit with classic donor dimethylaniline through two types of different rigid linkers. The combined steady-state and time-resolved spectroscopy molecules in solvents polarities comparison to solid-state solvation experiments doped polymer matrixes allowed distinguishing between conformation determined processes. photophysical measurements...

Singlet–Triplet energy exchange is an area of active research due to its role in optoelectronic devices and photodynamic therapy. Large spin–orbit coupling (SOC) difficult achieve simple hydrocarbon structures limiting the intersystem crossing (ISC) rates. A new approach enhance via helical molecular orbitals investigated oligoyne-bridged bifluorenes. Transient absorption studies showed a singlet-to-triplet ISC rate up 6 ns–1 resulting 0.84 triplet yield. Density functional calculations...

Organic single crystals offering numerous advantages due to their long‐range molecular order are considered a promising gain medium for realization of electrically‐pumped organic lasers provided amplified spontaneous emission (ASE) threshold is sufficiently low. Unfortunately, ASE thresholds such typically more than one magnitude higher (in the range tens kW cm −2 ) as compared those amorphous neat/doped films. Here, this issue addressed by rationally designing bifluorene‐based compounds...

Peripheral linking of rubrene emitters is found to deliver enhanced TTA efficiency <italic>vs.</italic> core linking. This provides valuable insight for their rational modification towards improved NIR-to-vis photon upconversion in the solid state.

Abstract Organic single crystals with long‐range molecular order ensure enhanced carrier mobility and stability as well emission outcoupling, which makes them attractive gain medium for electrically pumped organic lasers. Unfortunately, effects of excitonic coupling introduce losses degrading optical performance in crystals, hence higher lasing thresholds are observed compared to amorphous films. Here, crystal doping strategy is investigated a method avoid pronounced reabsorption...

A supramolecular chiral hydrogen-bonded tetrameric aggregate possessing a large cavity and tetraarylporphyrin substituents was assembled using alternating 4H- 2H-bonds between ureidopyrimidinone isocytosine units, respectively. The aggregation mode rationally shifted from social to narcissistic self-sorting by changing urea substituent size only. H-bonded tetramer forms strong complex with C60 guest, at the same time undergoing remarkable structural changes. Namely, adjusts guest via...

Exciton diffusion is considered to be of prime importance for controlling the recombination zone in organic light emitting devices. This particularly relevant lasers based on single crystals, where undesirable exciton-exciton annihilation at high concentrations inevitable. Here, exciton studied bifluorene crystals specifically designed laser applications, therefore featuring exceptionally low threshold amplification. The non-destructive induced transient grating (LITG) technique capable...

A ratiometric fluorescence cation sensor based on an asymmetrically functionalized donor–acceptor–donor′ purine derivative is presented.

Perylenediimide (PDI) compounds with no substituents in their core are widely used as the active units of thin-film organic lasers. Recently, bay-substituted PDIs (b-PDIs) bearing two sterically hindering diphenylphenoxy groups at 1,7-bay positions have received great attention because they show red-shifted emission respect to bay-unsubstituted PDIs, while maintaining high photoluminescence (PL) quantum yields and low amplified spontaneous (ASE) thresholds even doping rates. However, ASE...

Tin iodide perovskite CH3NH3SnI3 is often considered as a replacement for toxic lead halide perovskites. not only suitable production of solar cells, but also it emits in the near-infrared spectral region, which unique among metal On downside, layers tend to be high unintentional p-type doping, significantly limits cell efficiency. other hand, little known how this doping could affect optical and electrical properties important light-emitting applications. Here, we present an study carrier...

Recently, various 9,9′-bianthryl (BA) compounds demonstrated promising performances in blue OLEDs as charge transport and emissive materials. However, the emission of is dual character where highly excitonic locally excited state (LE) accompanied by internal transfer process (ICT), which induces a significant reduction radiative decay rate well low quantum yield. In this work, we address possibility to control ICT proportion LE introducing conjugated aromatic substitutions parallel...

Simultaneous fast energy funnelling between the neighbouring sheets and slower carrier exciton in-plane diffusion revealed in quasi-2D perovskites.

Low oxygen levels are critical for a long range of chemical transformations carried out in both flow and batch chemistry. Here, we present an inline continuous degassing system based on gas-permeable membrane inside vacuum chamber achieving monitoring ppm-level concentrations solutions. The presence was monitored with molecular probe continuously running UV-vis spectrometer. An automated setup discovering optimal reaction conditions minimal devised. parameters tested were: rate, pressure,...