Themed collection Journal of Materials Chemistry C HOT Papers

Hybrid perovskites containing organic cations with an extended conjugated system are an upcoming class of hybrid semiconductors for optoelectronics. We review the opportunities and challenges associated with these versatile materials.

This perspective summarizes the recently encouraging progress of asymmetric fused ring electron acceptors and tries to show a picture of the relationship between the asymmetric molecular structure, energy loss and device performance.

This paper systematically reviews the preparation technologies, research progress, and typical applications of perovskite material-based memristors.

This review systematically introduces and discusses the recent advances and progress in wearable electrochromic devices with optical modulation from the visible to infrared range.

Improvement in the synthesis of copper halide perovskites is fundamental in applications of different areas including LEDs, energy harvesting, detection, etc., and further highlights the direction for future research.

Carbon-rich macrocycles and carbon nanoribbons act as unusual optical materials in the free form or when combined with other guests.

Alkali metals have been used to obtain high-performance perovskite light-emitting diodes. In this review, we present an overview of the advances in alkali metal ions applied in PeLEDs. Challenges and the outlook are presented for their future applications.

Bi-doped gallium oxide thin films were prepared via van der Waals printing technology and exhibit excellent optoelectronic detection performance.

Bubble-free bilayer graphene has been fabricated by directly dry-laminating the clean backsides of two single graphene layers with designed asymmetric transfer media.

Versatile chewed gum composites with liquid metal were constructed by the stretch-knead-roller coating method for the high-value utilization of discarded gum waste.

A new nonbenzenoid acepleiadylene derivative (APD-DPP) has been synthesized, exhibiting NIR absorption and a higher charge mobility than its pyrene-based isomers. These features have enabled its application in high-performance NIR photodetectors.

The chiroptical properties of an asymmetric poly(diphenylacetylene) are related to the degree of polymerization, being opposite for polymers and oligomers.

Interlayer interactions are proved to be essential in determining the accurate active site of metal–benzenehexathiol (M–BHT) for hydrogen evolution and Mo–BHT is predicted to be a new promising member of the family of highly active M–BHT catalysts.

OECTs capable of undergoing a reversible modulation of ON current by up to 30% via irradiation with UV and visible light were realised via blending of a mixed ionic–electronic polymer (pgBTTT) and a photoswitching spiropyran derivative (OEG-SP).

The Förster resonance energy transfer (FRET) process has been utilized to construct host–guest systems with stimuli-responsive room-temperature phosphorescence (RTP).

This paper proposes a strategy for the large-scale preparation of stretchable silver inks, which can be applied to fabricate a conformal on-skin electrode array via screen printing for a stable human–machine interface.

We devised single-EML SP-WOLEDs with luminescent gold(III) emitters featuring high EQE_max of 12.72%, CIE coordinates of (0.40, 0.40), and CRI of 93, which is among the best values for the single-EML SP-WOLEDs with CRI > 90 reported in the literature.

A new donor–acceptor type circularly polarized luminescence material has been developed, and a dihedral angle engineering strategy has been demonstrated for the first time to significantly amplify the luminescence dissymmetry factors.

Modulating the helical pitch by simply playing with steric effects in a series of helically flexible BODIPY dimers allows easy tuning of the luminescence dissymmetry factors associated with their circularly polarized emissions.

Boosting organic room-temperature phosphorescence performance through luminescence sensitization involving multi-step energy transfer.

A PAM/gelatin/TA-CNT hydrogel with skin temperature-triggered adhesion and excellent sensing properties.

In this work, nitrogen-doped reduced graphene oxide/hollow nickel–magnesium ferrite composite aerogel was prepared, which had a unique three-dimensional porous network structure, broadband and high-efficiency microwave absorption performance.

A superior self-healing organohydrogel with multi-environmental stability for direction-recognition and information transmission under humid environments and low-temperature conditions.

Cu-doped MnBi crystals adopt a new type of high-temperature phase of the well-known permanent magnet, MnBi. The magnetic diagram demonstrates the evolution of magnetic orders along with increasing concentration of Cu in such a system.

Synergistic effect of reduced off-centering displacements of B-site cations, enhanced antiferrodistortive and decreased AFE domain size leads to significantly enhanced E_AF of ≥45 kV mm⁻¹ and W_rec of ∼5.5 J cm⁻³ in NaNbO₃-based lead-free ceramics.

Using the electrically tunable nature of graphene in the mid-IR range, a one-to-many mapping strategy between the metasurface and spectral signals is presented for ultrasensitive molecular fingerprint detection and refractive index sensing.

Ferroelectric ceramics have low energy storage performance due to their nearly square hysteresis loops and low dielectric breakdown strength, which affects their practical applications for high-power energy storage capacitors.

An artificial skin that simulates not only the mechanical performance but also the conductive behavior of natural skin is developed based on a zwitterionic polyurethane ionogel, which could be used as wearable sensors.

An external quantum efficiency of 6.7% and a long operational lifetime of 136 h at 1000 cd m⁻² were simultaneously realized for organic light-emitting diodes based on the deep-blue boron emitter (B-N-S-3), owing to the reduced intersystem crossing rate of the emitter.

PBCz-FBTz with fluoro-substituents exhibits superior hole transport properties and passivation effects to PBCz-BTz. The devices employing PBCz-FBTz as dopant-free hole-transporting material show a champion PCE of 20.71% with excellent stability.

Amide solvents were used as terminal coordinated molecules to tune the pore sizes of Ca-MOFs, achieving the pore size controllable fluorescence sensing performance towards trinitrophenol (TNP).

Piezochromism of BaCuSi₄O₁₀ and BaCuSi₂O₆ during compression, and the evolution of near-infrared luminescence with pressure.

Gold nanoparticles are known for their red or violet colours in transmission related to the localized plasmon resonance. They can sometimes generate an orange colour in reflection. These properties make them a new type of colouring pigment.

The prepared coating had good superhydrophobic and photothermal de-icing properties. It could be applied to personal thermal management, oil–water separation and solar-steam generation.

Two non-fullerene acceptors containing naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole) moieties with fluorinated and chlorinated dicyanomethylidene-indan-1-one units as the flanking end-groups were developed and used for constructing organic solar cells.

The non-radiative recombination caused by perovskite and its relevant interfaces greatly impedes further improvement of the efficiency and stability of PSCs, hindering their further commercialization.

A multifunctional vertical organic phototransistor for smart optoelectronic applications has been demonstrated by precisely engineering the current path.

The bimetallic Ln-MOFs exhibit temperature dependent luminescent behavior, proving that chemical components would affect the ratiometric luminescent temperature sensing performance.

A MOF/hydrogel film-based array sensor is prepared and exhibits excellent ability to recognize three nitrophenol isomers.

The lead-free double-perovskite Cs₄CuSb₂Cl₁₂ is used for Q-switched mode-locking an Yb-doped fiber laser with ∼1 μm NIR modulation, high pulse-energy operation and low saturation power, showing huge potential for integration into photonic devices.

Incorporation of a benzothiadiazole moiety into a thiophene and naphthalene diimide-based copolymer improves electron mobility, conductivity and stability in the doped state.

Using a sensor material consisting of a conductive polymer and Ag nanoparticles, an ultra-flexible temperature-insensitive strain sensor is developed with a minimum bending radius of 0.14 mm and temperature coefficient of resistance of 0.11% K⁻¹.

Direct and trap-assisted recombination of electrons and holes is suppressed by applying tensile strain in lead halide perovskites containing halogen vacancies.

“Molecular asymmetry” for spiro host development led to synergy between functional group and asymmetric core in electronic and steric effects, rendering ∼100% photoluminescence quantum yield and top-rank efficiencies of 69.3 lm W⁻¹ and 22.9% from the single-emissive-lay TADF WOLEDs.

Monolayer Ru(OH)₂ is an FV semiconductor with a high Curie temperature, and it also exhibits topological phase transition behavior under strain.

Molecular-based multifunctional material [2-methyl-1,5-pentanediamine][BiCl₅] has interesting properties, such as phase transition, piezoelectric, second harmonic generation, dielectric relaxation, semiconductor and so on.

In this work, we have synthesized Ca₃Ti₂O7:Pr³⁺, Er³⁺ phosphors with PL, LPL, PSL, UCL, and ML phenomena. Based on the skillful cooperation of PSL and UCL, dynamic anti-counterfeiting technology has been realized by modulating the 980 nm laser.

This work reports highly efficient B/N/O-participated multi-resonance thermally activated delayed fluorescence emitters with a simple peripheral decoration strategy, enabling electroluminescence device with external quantum efficiency up to 36.5%.

Gallium nitride (GaN) is a third-generation wide bandgap semiconductor well-suited for power electronics and ultraviolet optoelectronics.

Lattice anharmonicity induced ultra-low lattice thermal conductivities, high Seebeck coefficients, and optimum electrical thermal conductivities lead to a high figure of merits in n-type and p-type ternary chalcogenides LiMTe₂ (M = Al, Ga).

A novel photothermal conversion cocrystal of TMBZ-TCNB exhibiting 59.46% photothermal efficiency under 808 nm laser radiation. The TMBZ-TCNB-PU interfacial evaporator shows an evaporation efficiency of 63.49% under 1 kW m⁻²  radiation.

Non-halogenated solvent additive DMN induces nucleation and crystal growth of Y6 molecules twice during the LBL blade-coating process, promoting the crystallization and nanoscale phase separation and leading to enhanced PCE of LBL blade-coated OSCs.

A perovskite-coated silver nanofilm substrate realizes high sensitivity detection of probe molecules.

The parallel and vertical intercalations of the layered PbI₂ in CsPbI₃ result in type-I and type-II band alignments, respectively. The deep-level states caused by certain defects in PbI₂ are not active recombination centers.

The MoS₂ nanotubes assembled from MoS₂ nanosheets are wrapped in rGO. The NC-MoS₂@rGO is endowed with ultrahigh capacity, high cycle stability and rate capability. Addition of graphene has a positive effect on battery performance by DFT calculation.

The textile-based electrophoretic display has been created and exhibited high contrast ratio, a low voltage, and good stability. The static display clothing and a dynamic display wristband watch show the potential for truly wearable displays.

The influence of non-intrinsic factors on the charge–discharge performance of energy storage ceramic capacitors is studied, and an ideal test standard for charge–discharge of energy storage ceramic capacitors is proposed.

By introducing local energy clusters within the NaGdF₄ lattice, the optimal Er³⁺, Ho³⁺ and Tm³⁺ doping concentrations were increased to 8, 8, and 2 mol%, respectively. The UC intensity was enhanced approximately 54.3 times by doping Ca²⁺.

Ti³⁺ self-doped BaTiO₃ has been successfully developed as a multifunctional sensor, demonstrating outstanding performance in detecting light intensity, force, and temperature.

Beyond steric effect, non-conjugated functional groups play a crucial role in triplet manipulation of heterocylce aromaticity hot exciton material. A series of new blue-emitting molecules were successfully fabricated with high luminous efficiency.

Synthesis of thirteen diversely functionalized NDIs/PDIs and their radical anions are shown with a large increase in the radical anion stability with the extent of thionation, and hold promise as new open-shell NIR absorbers and redox-catalysts.

The phase transition mechanism of KCMP crystals was revealed and an efficient second harmonic generation output was achieved using emerging additional periodic phase technology.

Nitrogen-doped reduced graphene oxide/ferroferric oxide/iron/carbon composite aerogels were prepared, which had a unique three-dimensional porous network structure and excellent dual-band electromagnetic absorption performance.

This work exploits the synergistic effect of multiphase coexistence and local structural heterogeneity to achieve high piezoelectricity in relaxor ferroelectric materials.

Hierarchical silicalite-1 co-templated by carbon nanotube and tetrapropylammonium hydroxide was used to confine CsPbBr₃ PQDs, showing multiple functions for optical thermometry, fingerprint identification, Fe³⁺ detection and anti-counterfeiting.

A soft structure with continuously variable stiffness and fast response was designed. Varying the electric field strength (0 to 4.5 kV mm⁻¹), the rate of stiffness variation is over 1500%. The response time to load change is within 65 ms.

The strategic incorporation of pendant acridan units to the multiple resonance framework expedited the reverse intersystem crossing process, deriving a set of high-performance deep-blue emitters with external quantum efficiencies up to 28.7%.

The electron-donating/withdrawing abilities of the peripheral groups and the steric hindrance effects should be two key optimization parameters in constructing high-performance CP-MR-TADF materials.

By switching the aggregated state of the solid from the crystalline to the amorphous form, the gated transformation of photochromism was realized and can be interconverted, demonstrating a new strategy for the regulation of photochromism.

Thin film sputtering syntheses make new cation disordered Mg–W–N phases. Annealing the films drives cation ordering, which matches the phase produced by bulk synthesis.