Shaolong Gong

Flexible films enable high-performance X-ray imaging and ionization detection.

Tansparent uniform scintillators fabricated via in-situ crystallization of Bmpip ₂ Cu ₂ Br ₄ and Bmpip ₂ Cu ₂ Br ₂ I ₂ in PMMA showed high X-ray spatial resolution of > 20 lp mm ⁻¹ and excellent α/β/γ detectability, ideal for imaging and radiation monitoring.

Chiral Re(I) complexes are promising materials for optoelectronics and biomedicine, yet their potential remains largely untapped. Herein, we report a pair of enantiomeric Re(I) complexes, (+/−)‐[Re(CO) ₃ (L)Br], supported by chiral dipino‐4,5‐diazafluorene‐based ligands (L). These complexes exhibit dual functionality in circularly polarized luminescence (CPL) and enantioselective cytotoxic activity. They display bright green CPL (phosphorescence) in both solution and the solid state, with | g _lum | values of 10 ⁻³ order. When employed as emitters in OLEDs, they achieve efficient green electroluminescence (λ _EL = 530 nm). Moreover, these complexes readily enter tumor cells and display pronounced enantiomer‐dependent cytotoxicity. The (+)‐isomer shows higher toxicity toward Hep2 cells (LC ₅₀ = 32.2 µ m ) than the (−)‐isomer (LC ₅₀ > 50 µ m ), while the (−)‐isomer is twice as potent against SK‐LU‐1 cells (LC ₅₀ = 12.6 µ m ) compared to its (+)‐analog. Strikingly, both enantiomers trigger profound cytoplasmic vacuolization–an unprecedented effect for Re(I) compounds. These data establish chiral Re(I) complexes as versatile candidates for advancing chiral photonics and targeted biomedical applications.

Highly efficient narrowband green emitters with a contorted double-boron framework and cyano modification enable non-sensitized OLEDs with a maximum external quantum efficiency of 36.5% and low efficiency roll-off.

Luminescent copper(I) complexes are emerging as sustainable and cost‐effective alternatives to conventional iridium(III) and platinum(II) phosphors in organic light‐emitting diodes (OLEDs). However, achieving electroluminescence efficiencies comparable to those of noble metal‐based emitters remains a formidable challenge. Here, an isomeric π‐extension strategy is adopted to develop two new Cu(I) complexes, Cu‐23BF and Cu‐43BF, by precisely tuning the fusion site of a benzofuran subunit on a carbazole ligand within a carbene‐metal‐amide (CMA) motif. Compared to the prototype complex Cu‐12BF, these new complexes exhibit more coplanar geometries, elongated molecular structures, and increased electron‐hole separation in their excited states, resulting in near‐unity photoluminescence quantum yields (up to 97%) and relatively high horizontal dipole ratios (up to 78%) in thin films. Notably, Cu‐43BF delivers a short thermally activated delayed fluorescence lifetime of 0.65 µs and a fast radiative rate on the 10⁶ s⁻¹ order, attributed to its well‐separated frontier molecular orbitals and favorable excited state ordering. As a result, the Cu‐43BF‐based OLED achieves a high external quantum efficiency of 29.4%, among the highest reported for Cu(I)‐based OLEDs. This work not only provides a practical and effective strategy for designing highly efficient Cu(I) emitters but also highlights the future direction for Cu(I)‐based OLEDs.

White organic light-emitting devices (WOLEDs) are promising for displays and lighting. However, significant challenges persist in achieving high efficiency, high color rendering index (CRI), and color stability. In this investigation, color-stable and high-efficiency WOLEDs with high CRIs were demonstrated by employing a green carbene-Cu(I)-amide complex, (MAC*)Cu(Cz), as a sensitizer in the emitting layer consisting of a blue thermally activated delayed fluorescence (TADF) emitter and a red phosphorescent emitter. Due to the rapid reverse intersystem crossing (RISC) rate of (MAC*)Cu(Cz) and the significant overlap between the photoluminescence (PL) spectrum of the sensitizer and the absorption spectrum of red phosphorescent materials, highly efficient energy transfer has been realized in the emitting layer. We ultimately achieved a current efficiency (CE) of 47.8 cd A⁻¹, a high external quantum efficiency (EQE) of 21.0%, the Commission Internationale de l’Eclairage (CIE) color coordinates of (0.38, 0.40), and high CRI of 83 for the solution-processed WOLED with only one-single white emissive layer, which outperformed any other analogs.

Organic scintillators have rapidly emerged in recent years for X‐ray scintillation and imaging, benefiting from their inherent advantages of abundant raw materials, low‐temperature processing, high mechanical flexibility, and easy of large‐scale fabrication. However, conventional organic scintillators suffer from weak X‐ray absorption and inefficient exciton utilization, limiting their commercial viability. To overcome these challenges, new‐generation organic scintillators have recently been developed with innovative emission mechanisms to ensure exciton utilization efficiency and the incorporation of heavy atoms to improve X‐ray absorption. In recent years, these advancements have led to remarkable progress in high‐performance X‐ray scintillation and imaging. Here, we present a concept article on new‐generation organic scintillators with high exciton utilization efficiency, focusing on molecular design, emission mechanisms, scintillation performance, and X‐ray imaging applications. We also discuss future development trends in organic X‐ray scintillators.