In the rare-earth tritelluride series (RTe3), light members (R = La-Sm) host a unidirectional charge-density-wave (CDW) order, whereas heavy members (R = Tb-Tm) develop both unidirectional and bidirectional CDW orders. Upon chemical doping, both subsets exhibit superconductivity concomitant with suppression of the CDW order(s). In contrast, although pressure-induced superconductivity has been widely reported in the heavy members, its existence in the light members has remained unclear. Here, we establish a comprehensive pressure-temperature phase diagram of the lightest member, LaTe3, using electrical transport, synchrotron x-ray diffraction, and Raman spectroscopy in diamond anvil cells up to 55.8 GPa, revealing two distinct superconducting phases. The first emerges as the CDW is strongly suppressed and rapidly reaches an optimal TC similar to 1.5 K near the CDW collapse at similar to 11 GPa, followed by only a weak decrease of TC over the broad pressure range of 11-36 GPa. The second appears above similar to 31 GPa in conjunction with a Cmcm-to-Pmmm structural transition, marked by an abrupt increase of TC from similar to 1.4 to similar to 2.5 K that then increases gradually up to 52.1 GPa.

We present a comprehensive study of EuTe4 single crystals using axis-resolved magnetization, electrical transport, electron spin resonance, and Raman spectroscopy at ambient pressure, complemented by high-pressure measurements up to 47.3 GPa. At ambient pressure, EuTe4 is determined as an A-type antiferromagnet (T-N similar to 7.1 K) with localized Eu2+ spins pointing along the a axis and aligning ferromagnetically within the basal plane and antiferromagnetically along the c axis. A spin-flop transition occurs below T-N at approximately 3/8 of the saturation magnetization when the magnetic field is applied along the a axis, the easy magnetization direction. Pronounced negative magnetoresistance accompanies this field-driven spin reorientation, reminiscent of the giant magnetoresistance effect in artificial magnetic superlattices. The pressure-temperature phase diagram reveals a semiconductor-to-metal transition with the suppression of CDW-related resistivity hysteresis near 4 GPa, a change in the T-N evolution at similar to 11 GPa, and an antiferromagnetic-to-nonmagnetic transition near 22 GPa, likely associated with pressure-induced lattice modulations. These results provide crucial insight into the interplay among charge, spin, and lattice degrees of freedom in layered EuTe4.

Here, we report the structure-property relationship in pressurized 4Ha-TaSe2 single crystals. Electrical transport and low-temperature Raman spectroscopy measurements indicate a charge density wave (CDW) transition at TCDW 120 K under ambient pressure. High-pressure transport experiments reveal a competitive relationship between superconductivity (SC) and CDW in 4Ha-TaSe2. Under compression, the CDW order is progressively suppressed and vanishes abruptly at a critical pressure Pc of 19 GPa. In contrast, the superconducting transition temperature is gradually enhanced from Tc 3.1 K at ambient pressure to an optimal Tc 7.8 K at Pc, followed by a slow reduction up to 83.7 GPa. Synchrotron x-ray diffraction experiments show that the pristine hexagonal structure remains stable under pressure, while the dimensionality transforms from quasi-2D to quasi-3D near Pc. Simultaneously, Raman vibrational modes exhibit significant anomalies around Pc, including changes in Raman intensity and pressure coefficients of normal in-plane modes, as well as in a two-phonon mode. Thus, the collapse of the CDW near Pc and the domelike superconducting phase diagram could be related to a dimensional crossover in the crystal structure. These findings not only establish the pressure-temperature phase diagram of 4Ha-TaSe2 polytype but also facilitate the systematic understanding of the interplay between SC and CDW across the transition-metal dichalcogenides family of materials.

Multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters are promising candidates for high-definition organic light-emitting diodes (OLEDs) and display, yet their long triplet state lifetime and slow reverse intersystem crossing (RISC) processes always lead to severe device efficiency roll-off. Herein, a synergistic phenylphosphine oxide/sulfide-locking/ heavy-atom strategy is proposed to rigidify the boron/nitrogen-fused MR-TADF frameworks and strengthen their spin–orbit coupling (SOC) effect. Four green emitters, BNPXZ-PO, BNPXZ-PS, BNPTZ-PO, and BNPTZ-PS, are constructed from 3,6-di-tert-butylcarbazole paired with phenoxazine or phenothiazine moieties. The meta-linked P=O/ PS unit and heavy-atom effect boost SOC and restrain vibrational relaxation, resulting in high kRISCs of up to 1.98 × 105 s−1 and photoluminescence efficiencies reaching 93%. Corresponding OLEDs show impressive performances, achieving maximum external quantum efficiencies (EQEmaxs) spanning 24.8–30.8%. Further TADF-sensitized devices realize elevated EQEmaxs of up to 35.2% with suppressed efficiency roll-off. Notably, BNPTZ-PS incorporating PS and phenothiazine segments affords the optimal photophysical and device characteristics. These results demonstrate that integrating phosphorus-locking motifs with moderate heavy-atom engineering represents an effective molecular design strategy to concurrently accelerate exciton upconversion, boost device efficiency and alleviate efficiency roll-off for MR-TADF emitters.

The efficiency of photocatalysis is severely constrained by rapid charge carrier recombination. Combining piezocatalysis in conjunction with photocatalysis constitutes a potent approach to enhance catalytic efficiency. In this work, a facile Bi2O3/Bi2WO6 heterojunction was constructed, which exhibits superior piezo-photocatalytic activity. Furthermore, the underlying synergistic mechanism was elucidated. The morphology and structure of the material were characterized using XRD, SEM, TEM, and XPS, while its piezoelectric properties were confirmed by piezoresponse force microscopy (PFM) analysis. Under simultaneous ultrasound and visible light irradiation, the Bi2O3/Bi2WO6 composite achieved a remarkable 97.82 % degradation efficiency for sulfadiazine (SDZ) within 40 min, with a degradation rate constant (k) of 0.0859 min-1. This rate is 8.59 and 4.11 times higher than that of individual piezocatalysis (k = 0.010 min-1) and photocatalysis (k = 0.0209 min-1), respectively. Scavenger experiments and electron paramagnetic resonance (EPR) analyses confirmed that the synergy between the piezoelectric field and band bending, induced by the combined light and ultrasound irradiation, effectively promotes the charge separation, transfer, and evolution of key active species, namely superoxide radicals (& sdot;O2-) and holes (h+). This study highlights the crucial role of the piezoelectric field in enhancing photocatalytic performance and provides a deeper understanding of the synergistic piezophotocatalytic mechanism.

The rare-earth intermetallic compound NdCuSb2 possesses an antiferromagnetic (AFM) order below T N = 3.78 K, with magnetic moments aligned along the b axis. Here, we systematically investigate the pressure evolution of the structural and electronic properties of a NdCuSb2 single crystal up to 53.4 GPa. With initial increasing pressure, T N decreases rapidly and eventually vanishes above P C = 3.5 GPa, indicating the complete suppression of the pristine AFM state. Upon further compression to 6.0 GPa, a new anomaly, T*, around 4 K is observed and shows a monotonous increment with pressure, suggesting the appearance of a new phase. Based on high-pressure XRD and Raman scattering measurements, the lattice structure remains very stable under pressure. Since the magnetoresistance curve exhibits a crossover from positive to negative above P C, we propose that the new phase possesses a different spin structure and marks the occurrence of a pressure-driven magnetic phase transition. In addition, the pressure evolutions of the residual resistivity ratio (RRR), n, A, and resistance values show abnormal behaviors around P C, further manifesting the occurrence of this magnetic phase transition.

Phosphorescent iridium(III) complexes have emerged as desirable organic light-emitting diode (OLED) materials. However, most of them exhibit broad emission spectra, which weakened the color purity of displays. In this work, four Ir(III) complexes (4-fpyICz)2Ir(tmd), (4-fpymICz)2Ir(tmd), (4-tpyICz)2Ir(tmd), and (4-tpymICz)2Ir (tmd) using main ligands of 4-(indolo[3,2,1-jk]carbazol-2-yl)furo[3,2-c]pyridine, 4-(indolo[3,2,1-jk]carbazol-2yl)furo[2,3-d]pyrimidine, 4-(indolo[3,2,1-jk]carbazol-2-yl)thieno[3,2-c]pyridine, and 4-(indolo[3,2,1-jk]carbazol-2-yl)thion[2,3-d]pyrimidine incorporating rigid indolo[3,2,1-jk]carbazole (ICz) unit and an ancillary ligand of 2,2,6,6-tetramethyl-3,5-heptanedione (tmd), were synthesized. In dichloromethane, these Ir(III) complexes exhibit green to yellow emission, peaking at 521-561 nm with relative narrow full width at half maximum (FWHM) bands of 32-48 nm, respectively, and the doped films show high photoluminescence quantum yields of up to 89 %. The OLEDs based on these four emitters exhibit good performance characteristics, with maximum external quantum efficiencies of up to 24.6 % and low efficiency roll-offs. This study reveals the practicality of incorporating rigid ICz group and nitrogen heterocyclic ring into the main ligands as a feasible strategy for Ir(III) complexes with narrow emission for efficient OLEDs with low efficiency roll-offs.

In many charge-density-wave (CDW) materials, superconductivity emerges as CDW order collapses, producing a dome-shaped phase diagram commonly associated with quantum criticality or direct competition between the two orders. Here, a distinct pressure-tuned case is identified in NdSeTe2, where the superconducting dome is fully embedded within a persistent CDW state. Electrical resistivity measurements reveal a conventional superconducting dome with a maximum transition temperature of TC ≈ 1.8 K near PC ≈ 2.6 GPa, where long-range CDW signatures disappear from transport. In striking contrast, high-pressure, low-temperature Raman spectroscopy uncovers short-range CDW correlations that remain hidden to resistivity, emerge beyond PC, and persist up to ∼10.0 GPa, spanning the entire superconducting dome. Synchrotron X-ray diffraction detects no structural transition up to 32.4 GPa, indicating that the CDW evolution is electronic in origin. These results establish an unusual phase diagram in which superconductivity develops within a persistent short-range CDW background, offering new insight into pressure-tuned collective states in low-dimensional quantum materials.

Chiral luminescence materials and their application in biological sensors, mechanoluminescence, triboluminescence, radioluminescence, X-ray scintillation, and circularly polarized organic light-emitting diodes have attracted widespread attention due to their circularly polarized luminescence properties. Among the chiral luminescence materials, phosphorescent complexes with noble metals have been widely investigated, benefiting from their ability to harvest both singlet and triplet excitons in devices. However, although phosphorescent manganese(II) complexes are highly cost-effective and exhibit good luminescence properties and low toxicity, the development of chiral Mn(II) complexes has been slow. This review mainly focuses on the molecular design strategies, photophysical and chiroptical properties, and applications of chiral Mn(II) complexes in different fields while discussing recent progress, challenges and outlook in this area.

Chalcohalides compounds represent a promising class of optoelectronic materials. Among them, QSeI (Q = In, Ga, Al) stands out due to its one-dimensional van der Waals structure and helical chain configuration. In this study, we investigate the pressure-tunable optical and electronic properties of InSeI. Optical absorption measurements reveal a rapid narrowing of the band gap at a rate of-0.1 eV/GPa, followed by a sharp collapse of 0.4 eV above 4.1 GPa. Meanwhile, the sample exhibits a striking color change from yellow to black, indicative of pronounced piezochromic behavior. Electrical transport measurements uncover an insulator-to-metal transition at 37.8 GPa, followed by the emergence of superconductivity with a critical temperature (Tc) of similar to 5.8 K. Synchrotron x-ray diffraction and Raman spectroscopy reveal that pressure-induced amorphization occurs at relatively low pressures, involving primarily intrachain disorder, which accounts for the abrupt band-gap reduction and coloration change. Upon further compression, the tubular framework collapses, and long-range disorder gives rise to a possible polyamorphic transformation, leading to metallization and superconductivity. The tunable tubular-chain structure and associated polyamorphism make InSeI a promising platform for optoelectronic application, such as optical switches, broadband absorbers, and pressure-sensitive photonic devices, and provide a fertile ground for exploring polyamorphic superconductivity in low-dimensional chalcohalide systems.

Chiral phosphorescent manganese (Mn(II)) complexes hold application promise in circularly polarized organic light-emitting diodes (CP-OLEDs) and three-dimensional (3D) display technologies due to their CP luminescence properties, but that simultaneously exhibit both high dissymmetry factors (gPL) and photoluminescence quantum yields (PLQYs) remain rare. In this study, we report planar chiral Mn(II) enantiomers, R/S-PhCyPO-MnBr2 and R/S-DPhPO-MnBr2, based on [2.2]paracyclophane phosphine oxide ligands, which demonstrate green photoluminescence with high PLQYs of 90

SrAl4, which possesses a BaAl4-type tetragonal structure (I4/mmm, No. 139), exhibits both a charge density wave (CDW) order and a topological semimetal state at ambient pressure. Here, the electronic and structural properties of SrAl4 were systematically investigated with pressure up to 49.4 GPa through electrical transport, X-ray diffraction (XRD), and Raman scattering measurements, as well as theoretical calculations. With increasing pressure, the T CDW is monotonically decreased, and the CDW state is eventually suppressed to zero temperature at similar to 10 GPa based on the linear extrapolation. At ambient pressure, three Raman vibrational modes are identified, which are assigned to B 1g (230.9 cm-1), E g 2 (302.7 cm-1), and A 1g (357.4 cm-1), respectively. Upon compression to P C = 19.0 GPa, the original Raman modes all disappear, and simultaneously, four new peaks emerge, which indicate the occurrence of a structural transition. Combined with XRD and theoretical calculations, the C2/m phase is believed to be the most plausible crystal structure of SrAl4 above P C. In addition, the residual resistance ratio as well as magnetoresistance shows abrupt changes across P C, which further manifest the structural transition (I4/mmm -> C2/m) of SrAl4 under high pressure.

In this work, we have systematically investigated the structural, vibrational, and electrical transport properties of topological semimetal ZrP2 under pressure using synchrotron x-ray diffraction (XRD), Raman spectroscopy, electrical resistance, and Hall-effect measurements, in combination with theoretical calculations. The XRD data show that while no evident structural transitions occur with pressures up to 43.1 GPa, the lattice-parameter ratio (a/b) reveals a diplike anomaly at PC 25 GPa. Concomitantly, one Raman-active phonon mode ( 113.3 cm-1) becomes increasingly softening with pressure and then beyond PC shows a hardening behavior, at various fixed temperatures from 300 K down to 10 K. This soft mode can be assigned to the A1g mode and refers to ac-plane vibrations of Zr and P atoms with "vortexlike" eigenvectors. Strikingly, superconductivity (SC) was observed to emerge around PC, with the onset critical temperature of 0.6 K increasing gradually to 1.3 K at the highest measured pressure of 49.5 GPa. In addition, a hole-to electron-dominated carrier-type crossover takes place again around Pc, involving the Fermi-level crossing of higher-energy electron-like pockets along the P-Y path. Analysis suggests that the emergence of SC may be triggered by the phonon-softening related enhancement of ionic polarizability. The present system thus can serve as an ideal platform to study the interplay of phonon softening and SC.

Three heteroleptic cyclometalated iridium(III) complexes, namely (dpapiq)2Ir(dipdtc), (dpapqz)2Ir(dipdtc) and (qzpcz)2Ir(dipdtc), with the sulfur-containing ancillary ligand N,N-diisopropyldithiocarbamate (dipdtc) were synthesized at 60 degrees C due to the strong coordination ability between S and Ir atoms. All molecular structures were confirmed by the single crystal characterization. The introduction of electron donors with large steric as triphenylamine or 9-phenyl-9H-carbazole into the isoquinoline and quinazoline as the main ligands in the Ir(III) complexes can tune the photophysical properties, thus improving the luminous efficiency and affect the corresponding organic light-emitting diode (OLED) performance. (dpapiq)2Ir(dipdtc), (dpapqz)2Ir(dipdtc) and (qzpcz)2Ir(dipdtc) complexes show red emissions peaking at 629, 631 and 631 nm with photoluminescence efficiencies around 60 % and phosphorescence lifetimes in the range from 0.63 to 2.04 mu s, respectively. Complex (dpapiq)2Ir(dipdtc) was selected as the dopant in the OLED, which exhibits stable electroluminescence peaking at 629 nm with Commission Internationale de L'Eclairage coordinates of (0.68, 0.31) and a narrow full-width at half-maximum of 44 nm. Furthermore, the device also possesses moderate performances with a maximum external quantum efficiency of 14.5 %.

Despite its layered orthorhombic lattice structure, CuTe hosts quasi-one-dimensional (quasi-1D) charge density wave (CDW) distortions of in-plane Te chains along the a axis below TCDW similar to 346 K. This unique quasi-1D CDW manifests itself as an in-plane resistivity anisotropy, i.e., the a-axis resistivity (rho a) displays an evident humplike anomaly below TCDW while the b-axis resistivity (rho b) is featureless. Herein, we present simultaneous measurements of rho a and rho b at various pressures to 16.0 GPa, in order to trace the quasi-1D CDW's evolution and its interplay with the induced superconductivity (SC). We found no sign of SC at ambient pressure from rho a and rho b with temperatures down to as low as 0.05 K. With the application of pressure, TCDW from rho a deceases linearly yet the quasi-1D CDW character of CuTe keeps unchanged with pressures to 6.4 GPa, above which it breaks down due to the formation of an isotropic electronic interaction-driven CDW. Meanwhile, a local superconducting pairing starts to nucleate at 3.9 GPa initially within the preexisting quasi-1D CDW Te chains (along the a axis) at similar to 0.4 K. For a given higher pressure, distinct discrepancies in the zero-resistance temperature and the upper critical field are observed, both of which disappear suddenly along with the CDW transformation. Such a rare observation of the in-plane anisotropic SC interlocking with the quasi-1D CDW in pressurized CuTe has been discussed in terms of the particular fermiology, local superconducting pairing, and strong CDW fluctuations that are all rooted in the quasi-1D, chainlike arrangement of its in-plane Te atoms.

We present the pressure-temperature phase diagram of Kondo lattice compound CeAgBi2 up to 23.4 GPa, which was constructed from electrical resistivity and magnetoresistance measurements. At ambient pressure, an antiferromagnetic phase (labeled AFM-1) below T-N1 = 6.4 K is observed and four critical fields H-C1-H-C4 (3.5, 4.6, 8.1, and 10.1 T) corresponding to successive metamagnetic transitions are identified at 2 K. Combined with synergetic extreme conditions (high pressure and high magnetic field), a different antiferromagnetic phase (labeled AFM-2) is revealed above 1.6 GPa, consistent with results of a previous report. More importantly, TN2 keeps nearly unchanged over a wide pressure range (>15.0 GPa), which is quite unusual. In addition, all metamagnetic transitions observed in the AFM-2 phase are stable under pressure and persist up to the highest studied pressure of 23.4 GPa, which can be ascribed to the magnetic frustration caused by competing anisotropic magnetic interactions. Since the crystalline electric field (CEF) splitting of CeAgBi2 is much smaller than its counterparts, the admixture of CEF levels is more likely under pressure, which may be responsible for this robust AFM-2 phase.

Layered parkerite-type ternary chalcogenide Bi2Rh3Se2, featuring one-dimensional (1D) Rh-Rh chains, exhibits the coexistence of bulk superconductivity (SC) and charge-density-wave (CDW) order at ambient pressure. Here, we report an exceptional evolution of CDW and SC in pressurized Bi2Rh3Se2. Upon compression, the CDW demonstrates a dome-shaped behavior that peaks at a critical pressure Pc1 of 12 GPa, while the SC concurrently displays a valley-shaped evolution, indicating a competitive relationship between the two electronic orders. Theoretical calculations suggest that the unusual CDW evolution can be attributed to a nonmonotonic variation of the predominant Fermi surface nesting, along with an enhancement of the minority momentum-dependent electron-phonon coupling. Above Pc2 33 GPa, the valley-shaped SC plateaus at the superconducting transition temperature Tc 2.33 K, which can be attributed to a dimensional crossover from a quasi-2D to a 3D structure. Our findings demonstrate that the layered Bi2Rh3Se2 provides an ideal platform for understanding a novel competing pathway between CDW and bulk SC, where the pressure-driven dome-shaped CDW is concurrent with an anticorrelated SC.

LnSbxTe2-x-δ(Ln = lanthanide) family has recently attracted intensive research interest due to its fruitful physical properties, such as non-trivial topological state, complex magnetism, charge density wave and skyrmion phase, making it a good platform to study the interplay among topology, magnetism and electronic correlation effect. Here, we choose GdSb0.46Te1.48, evidenced as an ideal antiferromagnetic (AFM) topological semimetal, and investigate its electronic and magnetic properties under high magnetic field along three crystallographic orientations via electrical transport and magnetization measurements. Compared with previous studies, here we have revealed a series of new magnetic phases (labeled as PP-4-PP-7) through magnetoresistance measurements. Combined with the magnetization data, we conclude that these new discovered phases are also likely AFM phases while their spin configurations are different. Moreover, the rich magnetic phases of GdSb0.46Te1.48could be attributed to the strong magnetocrystalline anisotropy.