Themed collection Journal of Materials Chemistry C Lunar New Year collection 2022

Free deformable, stretchable soft electronic devices are targeted by utilizing alkyl-π functional molecular liquids.

Perovskite LEDs represent a promising avenue for high efficiency and low-cost devices with excellent properties. The perovskite material's impact on lighting and advanced applications needs to be recognized to allow its entry to next-generation display technology.

This review highlights the important role of fullerene derivatives in several emerging research directions beyond OPV and summarizes recent progresses in the development of fullerene derivatives to boost device performance in these new fields.

This review summarizes recent advances in developing high-efficiency upconversion nanoparticles and nanomaterials for photovoltaic application.

This review summarizes the recent advances in low-cost materials for OSCs from the aspects of the synthetic method, active materials, interfacial materials and processing solution.

In this review, we summarized the recent progress in a humidity sensor for human body related humidity detections (including respiratory behavior, speech recognition, skin moisture, non-contact switch, and diaper monitoring).

Due to the increasing market demand for Mxene-based devices, van der Waals heterostructures based on 2D materials have increased rapidly worldwide during the last decade due to their wide range of demand in the fields of optoelectronics, catalysis, and energy storage devices.

This review summarizes the progress in solution-processed perovskite/organic hybrid photodetectors in terms of fundamental operation principles, material combinations and device architectures. The challenges and possible solutions are also analyzed.

This review summarizes recent developments in room temperature phosphorescent carbon dots, including their preparation strategies, luminous mechanism, and applications.

This review surveys the current developments of intrinsic stretchable polymer semiconductors, including backbone and side-chain engineering, polymer blending, fabrication processes and their next-generation biomimicking applications.

Two wide-bandgap copolymer donors with reduced synthesis cost offered decent PCEs up to 15.25% in organic solar cells.

A quaternary IR-NLO thioantimonate, K₂Ag₃Sb₃S₇, designed using an aliovalent-cation-substitution-induced (ACSI) strategy based on the centrosymmetric K₂Sb₄S₇ is reported.

Donor–donor′–acceptor molecules where the donor′ bridges the donor and acceptor have different possible interaction pathways for charge transfer.

All-polymer photomultiplication type photodetectors were built based on PMBBDT:N2200 (100 : 3, w/w) as photoactive layers, which can be applied in optical switch systems without any current pre-amplifier.

We present a high-performance blue phosphorescent organic light-emitting diode exhibiting a low operating voltage (4.1 V), high external quantum efficiency (23.4%, at 500 cd m⁻²) with a low efficiency roll-off (4.7%), and a long operation lifetime (time at which the luminance reaches 95% of its initial value, LT95 = 232 h).

A simple one-pot synthesis of stable red-emitting perovskite nanocrystals involved the addition of Cs-oleate, formamidinium bromide (FABr) and organic ammonium iodide salts (LnI, n = 1–5) to a hot flask containing oleic acid, oleylamine and PbI₂.

Efficient blue thermally activated delayed fluorescent emitters based on organic boron-acceptor are developed with high external quantum efficiencies and finely tuned CIE coordinates.

The effects of alkyl side units in double-cable conjugated polymers on the photovoltaic performance of single-component organic solar cells were systematically studied.

The intrinsically positive Seebeck coefficient of ionic material was successfully converted into negative by using PEDOT:PSS electrodes, offering a useful method for the development of a thermally chargeable supercapacitor with n-type polarity.

Two pairs of constitutional isomeric TADF dopants (35CzBPym and 25CzBPym; 35tCzBPym and 25tCzBPym) containing benzoyl pyrimidine (BPym) as an acceptor and carbazoles (Czs) as donors were designed for high-efficiency OLEDs.

Two platinum complexes PBSNND and AtFNND have been used to achieve high efficiency (EQE_max of 12.9% and 13.7%) hybrid white OLEDs with an ultrathin and singly doped phosphorescence emitting layer, respectively.

Time-resolved fluorescence anisotropy measurements and molecular dynamics simulations are used to study the energy transfer among dopant molecules in the emitting layer of organic light emitting diodes.

The nonlinear optical properties of a vanadium-based MXene, V₂C, were investigated at 1.9 μm wavelength both theoretically and experimentally.

This work proves that the amount of PbBr₂ is crucial for CsPbBr₃ superstructure formation although an excess of PbBr₂ prevents superstructure formation.

In order to solve the shortcomings of the complex manufacturing process and high cost of flexible pressure sensors, a low-cost and eco-friendly flexible pressure sensor is achieved using a simple do-it-yourself (DIY) approach.

Salt-percolated hydrogels show excellent anti-freezing and anti-drying abilities, high conductivity at ultralow temperatures (−78.5 °C), and excellent thermal and strain sensing performance, which can monitor various physiological signals.

Chemically stable SrO_1+x surface oxide with c(6×2) superstructure is formed, creating space charge layer and surface band bending effects on undoped SrTiO₃ (001), under elevated oxygen pressure and temperature conditions.

Conductive hydrogels are promising material candidates in artificial skin and muscles, flexible and implantable bioelectronics, and tissue engineering.

Greatly enhanced dielectric charge storage capabilities are achieved in composites via introducing ultra-thin FePO₄ nanosheets and designing bilayer structures.

Engineering the electronic properties of SnTe through Bi and Sb co-doping to improve the thermoelectric performance.

High-performance OPVs with relatively thick active layers are essential for large-scale production. A PCE of 15.63% is achieved by the optimized ternary OPVs with 300 nm thick active layers by combining the superiorities of two binary thick-film OPVs.

Regioregular yet near-amorphous indacenodithiophene-based polymers exhibit superior deformability as well as high mobility values up to 1.67 cm² V⁻¹ s⁻¹.

A series of multi-resonance ultra-pure-green TADF emitters based on bridged diarylamine derivatives is successfully developed for high efficiency and narrow emission OLEDs which exhibit a high EQE over 20% and narrow FWHM of less than 50 nm.

Future artificial lighting devices ought to be efficient, economical, environmentally benign and free of rare metals like iridium.

A series of donor–coumarin dyads exhibit dual emission with thermally activated delayed fluorescence which emerges from the π–π* and intramolecular charge-transfer transition states.

A novel method for the fabrication of high-temperature, lightweight, flexible and transparent Ni-based heaters via the laser digital patterning process of solution-processed NiO_x nanoparticle thin films on colorless polyimide has been developed.

We report a series of Cr³⁺-doped olivine phosphors with tunable luminescence from 940 to 1100 nm. They have promising applications in the field of food processing for both qualitative identification and quantitative analysis.

Cu₂O/MoS₂ hybrids are used for the low-operating temperature detection of NH₃. A sensing response of 872% is achieved for the M-5 sensor, displaying an improvement compared with bare Cu₂O (103%). The selectivity is also increased for M-5 sensor.

Transparent ionic conductive hydrogel sensor is fabricated by one-pot polymerization, which shows high stretchability and reliable sensitivity. Therefore, it can detect subtle human activities, such as pulse, speaking, and facial expressions.

Efficiency roll-off is a significant issue in blue light-emitting diodes (LEDs), but its origin still remains controversial.

Charge-transfer based molecular conductors have attracted great attention in recent years, but have been rarely explored in the field of electromagnetic materials.

Mechanically strong and thermostable composites are prepared for thermal management based on soft liquid metal and rigid aramid nanofibers.

Commensurate Lithium doping of two-dimensional lead halide perovskites leads to improved scintillation properties, with enhanced light yield, narrower energy resolution, higher radiation hardness and faster scintillation decay.

In this work, Janus monolayers are predicted for a new 2D MA₂Z₄ family by means of first-principles calculations. The predicted MSiGeN₄ (M = Mo and W) monolayers exhibit dynamic, thermodynamic and mechanical stability, and they are indirect band-gap semiconductors.

High-performance optoelectronic synaptic transistors are reported with a long-term memory by using organic–inorganic halide perovskites and oxide semiconductors.

We report the synthesis, morphology and photo-memory device applications of a block copolymer (BCP) consisting of poly(9,9-dioctylfluorene) (PFO) and polystyrene (PS).

A novel Eu_0.07Gd_0.03-MOF with high water stability, which can serve as ratiometric fluorescence sensor for “color-change-recover” detection of Fe³⁺ and ascorbic acid in an aqueous environment.

Molecular design approach for the simultaneous achievement of high efficiency and long lifetime in the long wavelength region.

This paper presents the synthesis of grain size-controlled 2D perovskite films for high-performance photodetectors by combining solvent engineering and hot casting.

GdAl₃(BO₃)₄:Cr³⁺ is used to fabricate a NIR-pc-LED that shows promise for plant lighting and applications in the nondestructive analysis of agricultural products.