Qi Pang

Mn2+-doped two-dimensional (2D) (PEA)2PbBr4 (PEA = phenethylammonium) nanosheets were synthesized and modified with chiral l-cysteine by room-temperature antisolvent recrystallization. Under 365 nm excitation, the optimized material exhibits dual-color photoluminescence (PL), comprising host excitonic emission at 410 nm and orange Mn2+ emission at 610 nm from the 4T1→6A1 transition. l-Cysteine increases the PL quantum yield from 33% to 71% and prolongs the average lifetimes of the excitonic and Mn2+ emissions from 1.9 to 3.0 ns and from 0.16 to 0.68 ms, respectively. Variable-temperature spectroscopy yields a low thermal activation barrier of 11.2 meV for host-to-Mn2+ energy transfer. Circular dichroism and dual-band circularly polarized luminescence measurements support chirality transfer from l-cysteine to the modified perovskite. The maximum absolute luminescence dissymmetry factors, |glum|, are 0.86 × 10–3 and 1.2 × 10–4 in the excitonic and Mn2+-emission regions, respectively.

Near-infrared circularly polarized luminescence (NIR-CPL) materials are promising for advanced photonic applications, yet simultaneously achieving pronounced chiroptical activity and efficient NIR emission remains challenging. Herein, we report a pair of enantiomeric zero-dimensional chiral tin(IV) chlorides, (R/S-APD)SnCl6 (R/S-APD: R/S-3-aminopiperidine), and activate broadband visible-to-NIR CPL through heterovalent Sb3+ incorporation. The chiral host lattice transfers molecular chirality to isolated [SnCl6]2– units through asymmetric N–H···Cl hydrogen bonding. Sb3+ doping introduces low-symmetry Sb-centered emissive centers, enabling ultrabroad 500–1000 nm emission. The R and S enantiomers exhibit mirror-image CPL with luminescence dissymmetry factor (glum) values of −2.6 × 10–3 and +3.3 × 10–3, respectively. Temperature-dependent photoluminescence reveals strong electron–phonon coupling and a high exciton binding energy, supporting robust self-trapped exciton emission. The material exhibits excellent stability, retaining 79% of its emission intensity after 120 days. This work establishes a host–dopant strategy that decouples chirality transmission from emissive-state engineering, providing a pathway toward stable chiral halide emitters for NIR photonics and imaging applications.

Utilizing the circularly polarized luminescence (CPL) of scintillators offers a distinct advantage for X‐ray imaging, as it significantly reduces optical crosstalk. Herein, we propose an effective strategy of crown ether‐assisted self‐assembly combined with halogen regulation to construct two novel pairs of isostructural chiral copper(I) halide clusters: R / S ‐Br and R / S ‐I. Under X‐ray or UV light excitation, R / S ‐Br exhibits red broadband emission with a photoluminescence quantum yield (PLQY) of 77.0%, time‐resolved PL (TRPL) decay time of 35.8 µs, and scintillation light yield (LY) of 5819 photons/MeV. In contrast, R/S ‐I displays yellow‐green broadband emission with a near‐unity PLQY, TRPL decay time of 2.86 µs, and a high LY of 14389 photons/MeV. The CPL asymmetry factor of S ‐Br and R ‐I is 1.23 × 10 ⁻² and 1.72 × 10 ⁻³ , respectively. Consequently, S ‐Br‐based and R ‐I‐based LEDs, along with near‐infrared imaging systems, demonstrate exceptional chiral optical selectivity. When using an X‐ray polarization optical system, the imaging resolution of the S ‐Br scintillator increased from 9 to 20 lp/mm, while that of the S ‐I scintillator improved from 16 to 25 lp/mm, with a detection limit of 3.15 µGy/s. Besides, the relationship between optical performance and structural/heavy atom effects, along with optimization mechanisms, was clarified, offering a facile strategy for high‐resolution, color‐tunable scintillators.

Two‐dimensional hybrid organic–inorganic perovskites (2D HOIPs) are promising for chiral optoelectronics and spintronics. However, long‐range chiral amplification remains difficult because conventional chiral organic spacers mainly induce localized lattice asymmetry. Here, we report an in situ polymerization strategy to construct synergistically coupled 2D tin‐based HOIP/polydiacetylene (L‐(C _n ‐NH ₃ ) ₂ SnBr ₄ /PDA) heterostructures. By changing the alkyl‐chain length of L‐(C _n ‐NH ₃ ) ₂ SnBr ₄ ( n = 4, 10, 18), the interfacial van der Waals interactions were systematically tuned. This tuning creates a mutual chirality‐amplification feedback loop: the chiral perovskite directs asymmetric PDA polymerization, while PDA provides geometric confinement to amplify the chirality of the perovskite lattice. Among these composites, L‐(C ₁₈ ‐NH ₃ ) ₂ SnBr ₄ /PDA shows the optimal synergy, yielding a high luminescence dissymmetry factor (| g _lum |) of 3.5 × 10 ⁻² , representing a significant enhancement over the pristine L‐(C ₁₈ ‐NH ₃ ) ₂ SnBr ₄ (| g _lum | of 7.0 × 10 ⁻³ ). Furthermore, the composite also exhibits a strong nonlinear chiroptical response with a significant dissymmetry factor ( g _SHG‐CD ) of 0.503. We further demonstrate the potential applications of these materials in information encryption and flexible polarized‐light applications. This work reveals interfacial chirality transfer and provides a versatile platform for chiral optoelectronic and spintronic materials.

Carbon‐based hole‑transport‑layer‑free perovskite solar cells (C‐PSCs) have attracted significant attention due to their low manufacturing costs and great potential for enhanced stability. However, the severe interfacial non‐radiative recombination caused by hydroxyl groups on the SnO ₂ electron transport layer surface, along with the intrinsic degradation of perovskite under operational conditions, adversely affects device performance. This work proposes a multifunctional interfacial modification strategy based on bis‐[3‐(triethoxysilyl)propyl]‐disulfide (TESPD), a molecule featuring both siloxane and disulfide motifs. Through hydrolysis and condensation on the SnO ₂ surface, followed by in situ cross‐linking of their multiple terminal silane groups, the molecules form a robust 3D covalent network, thereby forming a stable self‐assembled monolayer (SAM). This stable interlayer not only passivates surface ─OH defects on SnO ₂ to suppress charge recombination but also repairs the perovskite lattice via its disulfide bond (S─S) as a redox mediator, converting Pb ⁰ and I ⁰ defects back into Pb ²⁺ and I ⁻ for in situ self‐healing. Utilizing this “static passivation–dynamic repair” synergy, the target device displays remarkable long‐term operational stability by retaining over 90% of its initial efficiency over 630 h of continuous 1‐sun illumination at 25°C in a N ₂ atmosphere. This work provides a reliable interfacial engineering strategy for efficient and stable C‐PSCs.

This work reports a thermally induced phase transformation from ionic In-1 to ionic In-2 and finally to coordinate In-3 along with improved anti-Kasha room temperature phosphorescence.

The rational design of chiral ligands for perovskite quantum dots (PQDs) and the understanding of their structure-property relationships is challenging. Herein, l/d-proline (l/d-Pro) induces a concentration-dependent coordination transition from monofunctional to bidentate mode, enabling defect passivation and chiral transfer. green chiral PQDs achieve 99.69% photoluminescence quantum yield (PLQY) and emission dissymmetry factor (g_lum) of -2.1 × 10^-3. A light-mediated halide exchange strategy enables full-visible (440-760 nm) emission tuning, enhancing |g_lum| to 7.1 × 10^-3 while maintaining high blue/red PLQYs (88.96%/91.42%) via enhanced octahedral distortion. High-performance full-color circularly polarized light-emitting diodes (CP-LEDs) and white LEDs are fabricated, providing a paradigm for chiral perovskite optoelectronic device design.

The denser asymmetric hydrogen-bonding network of chiral ( R )-α-Mn isomer greatly distorts [MnBr ₄ ] ²⁻ tetrahedra, resulting in a superior SHG-CD response compared to that of ( R )-β-Mn isomer.

Intrinsically chiral active optical materials are currently a subject of intense research. While chiral ligand modification is an effective strategy for imparting chirality to perovskite quantum dots (PQDs), it faces challenges related to a limited luminescence dissymmetry factor and stability. Herein, this work reports a one-pot synthesis of R-/S-CsPbBr₃@SiO₂ PQDs. The chiral characteristics of R-/S-CsPbBr₃@SiO₂ PQDs originate from the surface anchoring of R-/S-2-phenylglycinol (R-/S-Phe), which triggers chiral lattice distortion of the [PbBr₆]^4- octahedra and strong electronic coupling. Notably, the silica shell acts not just as a protective barrier but as a spatial confinement matrix that facilitates a higher density of chiral ligand loading, thereby amplifying the dissymmetry factor (g_lum = -1.14 × 10^-2) by nearly an order of magnitude compared to bare counterparts. The encapsulated PQDs simultaneously achieve a high photoluminescence quantum yield of 84 ± 1%, exceptional water stability, and intense circularly polarized luminescence. This work offers a strategy for enhancing the chiroptical signals in multifunctional chiral metal halides.