Yongzheng Fang

We report a Ce ³⁺ /Tb ³⁺ co-doped glass for wavelength-conversion-based detection of 193 nm ArF excimer lasers. The glass exhibits efficient Tb ³⁺ emission under deep-ultraviolet excitation through host-assisted Ce ³⁺ –Tb ³⁺ energy transfer enabled by its low-phonon-energy network. In contrast to the optimum Tb ₄ O ₇ concentration of 5 mol% under 373 nm excitation, the strongest 193 nm emission is obtained at 4 mol%, indicating a distinct excitation mechanism involving the glass host. The optimized sample displays a linear fluorescence response to incident laser power ( R ² =0.94) with a detection limit of 0.63 W, demonstrating the feasibility of real-time monitoring of low to medium power ArF excimer lasers using wavelength conversion.

Both intra-cavity and extra-cavity manipulating optical solitons are efficient methods to investigate solitons’ dynamic properties in nonlinear optical systems. In this article, we mainly simulate extra-cavity manipulating a bright-gray vector soliton at 1064 nm wavelength regime, considering the bright soliton component and gray soliton component have same or slightly different central wavelengths. Five kinds of soliton parameters (including central wavelengths) are varied based on our proposed extra-cavity manipulation physical system. Both single-parameter variation method and dual-parameter variation method are adopted in the simulation. The manipulated bright-gray vector soliton’s pulse shapes and optical spectra that in orthogonal polarizations will have unique characteristics when different parameters vary. For instance, the slightly different central wavelengths can induce obvious temporal oscillations of orthogonally polarized pulse shapes at output terminal. Our simulations effectively explore manipulating different types of optical solitons in extra-cavity manipulation systems, providing effective reference values for studying the nonlinear dynamics of extra-cavity manipulating various types of optical solitons.

2D molecular ferroelectrics have attracted much attention due to their advantages such as low cost, easy processing, and structural tunability. However, the impacts of alkyl chain length on their bandgap, ferroelectric, and photoelectric properties remain unclear. Herein, we present a novel 2D molecular ferroelectric [C ₆ N ₂ H ₁₈ ]PbI ₄ with a P c polar monoclinic structure, a direct bandgap of 2.30 eV, a room‐temperature ferroelectricity with a maximum polarization ( P _m ) of 3.5 µC cm ⁻² . Remarkable polarization‐enhanced photoelectric performance has been achieved, yielding a maximum V _oc of ∼ 0.72 V and J _sc of ∼ 5.62 µA cm ⁻² . The impacts of chain length of diverse alkylamines spacer cations on bandgap, ferroelectric, and photoelectric of the homologous APbI ₄ system (A for 1,4‐diaminobutane, 1,6‐hexamethylenediamine, and 1,8‐diaminooctane) have been systematically investigated. The elongation of alkyl chain length induces a gradual decline in P _m , while simultaneously expanding the optical bandgap and notably enhancing device stability. This work provides a new perspective for the performance optimization of 2D molecular ferroelectrics toward next‐generation optoelectronic devices.

Cs₂AgInCl₆:xSn²⁺ with orange luminescence exhibits a large Stokes shift (360 nm) and enhanced PLQY in the visible range. The fabricated WLED shows an appropriate CCT and high R_a, indicating its potential application in optoelectronic devices.

A polarization-enhanced photovoltaic effect has been achieved in a zero-dimensional room-temperature molecular ferroelectric [C₈N₂H₂₂]_1.5[Bi₂I₉].

A series of violet light excitable Sr _{(2− y )} Ba _y Y ₄ La ₄ (SiO ₄ ) ₆ O ₂ : x Eu ²⁺ phosphors with tunable luminescence for high-quality white LEDs was developed through cation regulation.