The thermal decomposition products and kinetics of two typical organic–inorganic halide perovskites, CH3NH3PbI3 (MAPbI3) HC(NH2)2PbI3 (FAPbI3), were investigated via simultaneous thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. NH3 CH3I verified as the major gases MAPbI3. Furthermore, for first time, methane (CH4) was observed a degradation product MAPbI3 at elevated temperatures. In contrast to conventional wisdom, (HCN)3 (trimerized HCN) demonstrated gaseous...

Transparent glass ceramics containing Ce³⁺–Yb³⁺codoped Y₃Al₅O₁₂nanocrystals were prepared, and demonstrated to be promising materials for spectral conversion of visible sunlight near-infrared emission.

Surface Review and LettersAccepted Papers No AccessTE-four/TM-three bifunctional splitter in terahertz band by trapezoidal surfaceYongyuan Huang, Peihong Zenga, Yuqing Xiaoa, Hongwei Zhana, Jinjie Lia, Bo Wanga, Fangteng ZhangYongyuan Zenga Search for more papers this author , Xiaoa Zhana Lia Wanga Zhang https://doi.org/10.1142/S0218625X25501288Cited by:0 (Source: Crossref) PreviousNext AboutFiguresReferencesRelatedDetailsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack...

Germanate glass, owing to its high infrared transmittance, refractive index, and excellent nonlinear optical properties, has become a key material in the field of photonics. Inducing micro-nanostructures on surface germanate glass using femtosecond lasers can impart new functionalities applications material. In this study, self-assembled nanograting structures were successfully induced by laser direct writing. The effects parameters, including energy density, scanning speed, polarization...

We report on the formation of embedded self-organized, polarization-dependent nanogratings in germanium dioxide glass induced by an 800 nm, 1 kHz femtosecond laser. Optical birefringence was observed to vary with laser polarization both cases translating sample along and perpendicular propagation direction. Raman spectroscopy indicated that irradiated area suffered a network distortion. Scanning electron microscopy images written lines reveal periodic planar nanocrack arrays are aligned...

Ultrafast sub-ps hot carrier relaxation followed by subsequent ps transport from layered 2D to 3D-like perovskite phases is demonstrated.

RF2:Bi (R = Ca and Sr) phosphors were synthesized by solid state reaction method in air their luminescence properties investigated. Broad yellow-to-orange emissions peaking at ~550 nm (CaF2:Bi) ~600 (SrF2:Bi) observed under ~260 excitation. The emission centers inRF2:Bi are Bi2+ ions, the excitation bands of can be attributed to 2P 1/2 → 2S 3/2(1) transitions respectively. promising for application lighting due broad emission.

We investigated the influence of laser-induced air breakdown on femtosecond laser ablation aluminum target using time-resolved pump-probe shadowgraphic imaging method. The early-stage plasma expanding dynamics and subsequent behaviors shockwaves material ejection plume were analyzed through shadowgraphs recorded at different time delays. dominated mechanisms clarified stages during pulses ablating aluminum, which provide very valuable information for ultrashort metals.

Topological insulator (TI) Bi2SeTe2 nanosheets with very regular hexagonal morphology were synthesized by a hydrothermal route. Open aperture (OA) z-scan method was performed to measure the saturable absorption (SA) characteristics of as-prepared TI nanosheets. The measured modulation depth, saturation intensity and nonsaturable loss sample 61.9%, 4.46 GW/cm2 4.5% respectively. An ultrafast intraband scattering time ~50 fs obtained through simulating SA curve, which indicates may be good...

Abstract Nanostructuring in glass by ultrafast laser paves the way for integrated optics. In this paper, form birefringence induced direct writing GeO 2 is systematically investigated. It shown that pulse energy maximum retardance ≈65% lower than fused silica. The scanning two times higher stationary irradiation under same processing conditions. optimum duration lies within sub‐picosecond region, i.e., typically around 500 fs, while silica it picosecond regime at 1–2 ps. A reversed...

In-volume, self-assembled, three-dimensional, periodic micro-nano structures are induced in quartz crystal by tightly focused, 500-kHz femtosecond laser pulses. With suitable pulse energy, three different types of can be observed modified regions using scanning electron microscopy. The first one with period (ΛE) ~400 nm the direction polarization, i.e. nanograting, shows indicative features similar to that fused silica. second (ΛS) scan and third (Λk) propagation both equally spaced ~1 μm,...

Carrier lifetime in flexible CH₃NH₃PbI₃ films increases with increasing tensile strain, and conversely decreases compressive strain.

In recent years, 2D materials have been widely used in optical and photonic applications such as mode lockers, switches, polarizers, modulators. As is known, many are parabolic semiconductors. The electronic states determines the material's characteristics. energy band structure with a bandgap dominates electron dynamics process associated intrinsic light absorption. Particularly, Dirac cone flat (FB) special nonparabolic structures materials. characterized by zero bandgap, FB completely...

Cr 3+ –Yb codoped transparent glass‐ceramics containing Y 3 Al 5 O 12 nanocrystals were prepared by heat treatment of as‐prepared glass sample and characterized X‐ray diffraction transmission electron microscopy. The efficient energy transfer from to Yb ions through multi‐phonon‐assisted process was confirmed the luminescence spectrum fluorescent lifetime measurements. When excited lights a solar simulator in wavelength region 400–800 nm, greatly enhanced near‐infrared emission around 1 μm...

Ultrafast electron transfer is demonstrated from correlated triplet pairs generated by singlet fission in TIPS-pentacene to the CH₃NH₃PbI₃ perovskite.

Singlet fission (SF) converts a singlet exciton into two triplet excitons and holds great potential in the photovoltaic field. The pair state is proposed to play an important role SF. However, existence character of are still ambiguous date. In this study, we directly observed ultrafast formation long-lived bound 6,13-bis(triisopropylsilylethynyl) pentacene polycrystalline film using sub-10-fs broadband transient absorption spectroscopy. has strong near-infrared region shows distinct dynamic...

Er3+-doped glass and fiber are very attractive for near-infrared (NIR) lasers photonic applications. In this work, the full width at half maximum (FWHM) of NIR fluorescence emission germanate can be broadened from 72 to 99 nm when Al2O3 was added. addition, spectroscopic properties, including absorption spectra, Judd-Ofelt intensity parameters, cross sections, gain coefficient, lifetime, Al2O3-modified were systematically investigated. What is more, silicate-clad heavily core multimaterial...

In this Letter, we have demonstrated the direct writing of polarization-dependent light attenuator inside fused silica by tailoring 1 kHz femtosecond (fs) laser induced self-organized nanogratings. Optical birefringence was observed to vary with polarization plane azimuth fs and scanning direction. The formation nanogratings confirmed electron microscopy observation. A fabricated forming a consisting nanograting lines laser. attenuation efficiency improved multilayer structure. technique may...

We report on three-dimensional (3D) precipitation of ZnO crystals inside a silicate glass by 500 kHz femtosecond pulse laser. The and distribution in are confirmed analyzed Raman spectra mapping. Mirco- luminescence is observed the laser modified region when excited or Xenon lamp. effect average power has also been investigated. possibility 3D optical data storage using phenomena demonstrated.

We report the observation of an anomalous polarization dependent process in isotropic glass induced by long time stationary irradiation a high repetition rate near-infrared femtosecond laser. Two distinctive types microstructures were at different stages. At early stage (a few seconds), dumbbell-shaped structure elongated perpendicularly to laser formed top modified region, which was later erased further irradiation. (above 30 s), bubbles filled with O2 irradiation, distributed along...