With the challenging aim to obtain efficient white emission from a single low-molar-mass organic emitter, four phenothiazine boronic ester derivatives (H-PTZ-Bpin, CHO-PTZ-Bpin, CN-PTZ-Bpin and PhCN-PTZ-Bpin) were synthesized by incorporating different...

A series of donor−acceptor alternating copolymers with M n ≤ 12,000 g mol −1 and moderate polydispersity (Đ = 1.5− 2.5) were synthesized via RAFT copolymerization of styrene-based donor monomers and maleimide-type acceptor monomers in the presence of S-dodecyl-S′-(α,α′-dimethyl-α″-acetic acid)trithiocarbonate as a chain transfer agent. It was shown that synthesized alternating copolymers were characterized by high thermal stability (T d5 = 375−465 °C), and most of them exhibited exciplex emission via the through-space charge-transfer (TSCT) mechanism and displayed aggregation-induced emission. The color of the emission of synthesized copolymers largely depended on the nature of the acceptor monomer and could be changed from blue to orange depending on the copolymer structure. These copolymers in solid state demonstrated delayed fluorescence in the range between 0.35 and 6.2 μs and moderate photoluminescence quantum yield (2.12−6.32%) in air. Multicolor host-free solutionprocessable TADF OLEDs using synthesized alternating copolymers as emitters were fabricated, which showed good stability of electroluminescence spectra at different voltages. The highest external quantum efficiency of 7.84% was reached for the green emitting device.

COVID-19 pandemic and the confusion of the world at the beginning of the epidemic affected many aspects of the life and health care. In this regard, organ donation as a vital approach for life saving in patients on the waiting list was influenced too. This essential treatment requires the provision of vital organs from the brain death cases, which is a sensitive, accurate and lengthy process. This process begins with the identification of Glasgow Coma Scale (GCS) cases less than five and is followed by organ harvesting and assignment to waiting list patients. Organ donation and factors related to its process have been fluctuated during three specific time periods, including the first and second year of the epidemic with the year before the epidemic. This decrease in the number of donations has been felt worldwide and it has been reported that this number has decreased significantly even in the amount of blood donation. Numerous barriers to the treatment system during the epidemic, limitations of surgeries except in emergencies, asymptomatic patients, and many unknown aspects of the disease have shown that the policies and approaches of procurement centers need to be changed to continue efforts in this situation. New protocols (according to the needs of these days) should be developed and implemented according to the conditions ahead.

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