Elegant Z-scheme WO3/Au/In2S3 nanowire arrays were precisely constructed through a facile step-by-step route. Surface potential change on pristine or In2S3–Au coated WO3 single under dark and illumination detected Kelvin probe force microscopy (KPFM) technique indicates that the vectorial holes transfer of In2S3 → Au should occur upon excitation both In2S3. In such charge processes, embedded nanoparticles in heterojunction systems act as mediator for electrons conduction band valence The...

We have performed the first single-particle spectroscopic measurements on individual graphene quantum dots (GQDs) and revealed several intriguing fluorescent phenomena that are otherwise hidden in optical studies of ensemble GQDs. First, despite noticeable differences size number layers from particle to particle, all GQDs studied possess almost same spectral lineshapes peak positions. Second, with more normally brighter emitters but associated shorter lifetimes. Third, spectrum was...

An all-solid-state Z-scheme system array consisting of Fe₂V₄O₁₃/RGO/CdS was rationally designed for visible light-driving photocatalytic CO₂ reduction into CH₄.

Two-dimensional MoS2 nanosheets were in situ grown on TiO2 to form two-dimensional (2D) hybrid nanojunctions, with which compactly contact increase the interfacial area. was identified as a promising cost-effective substitute for noble metal cocatalysts such Pt, Au, and Ag, shows superior activity selectivity reducing CO2 CH3OH aqueous solution these under UV-vis light irradiation. The photo-luminescence (PL) spectra transient time-resolved PL decay measurements reveal that fast electron...

An all-solid-state Z-scheme was constructed for the photocatalytic reduction of CO₂, consisting CdS and TiO₂as photocatalysts, reduced graphene oxide as a solid electron mediator.

Here we report multilayer hollow spheres consisting of alternating ultrathin Ti0.91O2 nanosheets and CdS nanoparticles via exquisite layer-by-layer self-assembly to achieve an all solid-state Z-scheme system with 7-times enhancement the CH4-production rate relative pure spheres, due a greatly prolonged lifetime charge carriers.

High-quality one-dimensional WO3/CdS core/shell nanowire arrays used as photoanodes in photoelectrochemical (PEC) cells were for the first time prepared via a rational, two-step chemical vapor deposition process. The narrow band-gap CdS shell was homogeneously coated on entire surface of as-grown WO3 core arrays, forming coaxial heterostructures. heterostructure facilitates photogenerated electron–hole pair separation and electron transfer from to nanowires under visible light illumination....

A single-component white-emitting Sr₃LuNa(PO₄)₃F:Eu²⁺,Mn²⁺ phosphor have been synthesized and the electronic structure photoluminescence properties investigated firstly.

UV excited, green-emitting Sr₄Gd₃Na₃(PO₄)₆F₂:Ce³⁺,Tb³⁺ phosphors with zero-thermal quenching of Tb³⁺ emission have been obtained and investigated in detail.

A series of Ce3+/Tb3+ doped Li3Sc2(PO4)3 phosphors has been obtained using high temperature solid state reactions. Density functional theory (DFT) calculations the CASTEP module have given an insight into bandgap and electronic structures hosts. The phase formation crystal structure prepared samples were verified X-ray diffraction Rietveld refinement analysis. Samples singly with Ce3+ ions had intense emission centered at 350 nm under UV light irradiation, while Tb3+ exhibited a typical...

Temperature and wavelength dependence of energy transfer (ET) process between quantized states surface trap CdSe quantum dots was investigated, respectively. The experimental results demonstrate that the photoluminescence (PL) intensity decreases with respect to state emission, especially at lower temperatures. observed ET which is influenced by thermal population behavior. At same temperature, silver films can greatly enhance rate from due plasmonic coupling effect.

Photoluminescence (PL) decay dynamics of multiexcitons in semiconductor nanocrystals (NCs) are dominated by the nonradiative Auger effect, making it difficult to explore their basic optical processes such as radiative recombination and energy transfer (ET). Here we constructed a single-particle ET system attaching several acceptor dyes surface donor NC study biexcitons at single-NC level. By comparing single-exciton biexciton PL lifetimes same before after were bleached, respective could be...

In this paper, by changing the ligand-to-metal charge transfer (LMCT) band through Mo6+ substitution, excitation of our prepared NaLaMg(W,Mo)O6:Eu3+ sample had been extended largely and could match with InGaN-based LED chips successfully. Diffuse reflection spectra photoluminescence properties investigated as a function W/Mo ratio. Density functional theory calculations gave an insight into regulation on aspect structure. The quantum efficiency together thermal stability typical samples...

In pursuit of warm WLEDs, exploration novel phosphors and regulation the existing are two approaches usually used in luminescent material field. this work, we prepared green Ca2Ta2O7:Bi3+ firstly investigated their properties detail. The as-prepared exhibits intense emission 450-580 nm range under UV excitation, which matches well with chip can efficiently avoid re-absorption problem. improvement intensity thermal stability phosphor was achieved using different charge compensation methods...

In an energy transfer (ET) process, it is the optical responses of donor and acceptor materials on single-particle level that ultimately determine its overall performance. Here we conduct time-tagged, time-resolved measurements to correlate photoluminescence (PL) intensities lifetimes a semiconductor nanocrystal (NC) dye molecules linked surface. We reveal PL intensity follows exactly blinking behavior NC shows step-like quenching due photobleaching effect. The corresponding recovery has...

We have investigated the structure and luminescence properties of a novel efficient Ca₂GaAlSiO₇:Eu²⁺/Ce³⁺phosphor obtained by cation substitution for UV-WLEDs.

Because of their spiral wave front, phase singularity, zero-intensity center and orbital angular momentum, dark hollow vortex beams have been found many applications in the field atom optics such as cooling, transport guiding. In this paper, a method for generating confluent hypergeometric beam by computer-generated hologram displayed on spatial light modulator is presented. The formed interference between single ring Laguerre-Gaussian plane wave. far-field Fraunhofer diffraction optical...

Fluorescence resonance energy transfer (FRET) based on quantum dots (QDs) and dye molecules have great application potential in biochemical fields. How to achieve an efficient process has become important research topic. Pressure can be used regulate the process, but its regulation metal halide perovskite systems is rarely reported. Herein, FRET between CsPbBr3 QDs Rhodamine B (RhB) under high pressure investigated. Upon compression 1.3 GPa, rate of CsPbBr3–RhB composite reaches 0.21 ns−1...