Strong Green Emission Band Research Articles

Opto-electronic properties of Zn(1-x)VxO: Green emission enhancement due to V4+ state

Vanadium incorporation in ZnO modifies the lattice structure. The valence state of V plays an important role, controlling the oxygen content and thereby dimensions of the lattice. Both V4+ and V5+ are more electropositive than Zn2+ and reduce oxygen vacancies, resulting in lattice expansion. However, the sizes of both V4+ and V5+ are smaller than Zn2+, thereby resulting in the lattice contraction. The internal competition of increasing oxygen content and reducing effective crystal radius decides the lattice expansion and contraction. This affects the lattice strain and changes electronic levels, which modify absorption and emission processes in between the valence and conduction bands. A strong green emission band not due to oxygen vacancy but due to defects contributed by vanadium is also dependent on the oxidation state of vanadium. Bandgap also increases with the increase in the V4+ content.

Ultraviolet emission enhancement in ZnO thin films modified by nanocrystalline TiO2

In this study, nanocrystalline TiO2 modified ZnO thin films were prepared by electron beam evaporation. The structural, morphological and optical properties of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), UV-visible spectroscopy, fluorescence spectroscopy, respectively. The composition of the films was examined by energy dispersive X-ray spectroscopy (EDX). The photoluminescent spectrum shows that the pure ZnO thin film exhibits an ultraviolet (UV) emission peak and a strong green emission band. Surface analysis indicates that the ZnO thin film contains many oxygen vacancy defects on the surface. After the ZnO thin film is modified by the nanocrystalline TiO2 layer, the UV emission of ZnO is largely enhanced and the green emission is greatly suppressed, which suggests that the surface defects such as oxygen vacancies are passivated by the TiO2 capping layer. As for the UV emission enhancement of the ZnO thin film, the optimized thickness of the TiO2 capping layer is ∼16 nm. When the thickness is larger than 16 nm, the UV emission of the ZnO thin film will decrease because the TiO2 capping layer absorbs most of the excitation energy. The UV emission enhancement in the nanocrystalline TiO2 modified ZnO thin film can be attributed to surface passivation and flat band effect.

Effects of Er3+ and Pr3+ Substitution on Structural, Dielectric, Ferroelectric and Photoluminescence Properties of the BaTi0.9Zr0.1O3 Ceramic

BaTi0.9Zr0.1O3 (BZT), Ba1−xLn2x/3□x/3Ti0.9Zr0.1O3 (with x = 0.5% mol and Ln = Er3+) (BZT-Er) and Ba1−xLn2x/3□x/3Ti0.9Zr0.1O3 (with x = 0.5% mol and Ln = Pr3+) (BZT-Pr) were prepared via the conventional solid-state reaction method. X-ray diffraction showed that all these ceramics were in the single perovskite phase at room temperature (RT). The temperature dependence of dielectric behavior was investigated in the temperature range 25–225°C and exhibited a classical ferroelectric behavior. A slight decrease of the Curie temperature (TC) with Pr3+ and Er3+ substitution was observed in addition to an increase in the maximum dielectric permittivity (\( \varepsilon_{r\,\rm{max} }^{{\prime }} \)) of about 40% for the BZT-Er. At RT, the ferroelectric and piezoelectric coefficients were decreased for BZT-Pr, but were maintained for BZT-Er with a piezoelectric coefficient (d33) of 185 pC/N, a planar electromechanical coupling factor of 30%, and a remanent polarization of 11.6 μC/cm2. The Raman bands as a function of temperature confirmed the paraelectric-ferroelectric phase transition of all those ceramics. The photoluminescence spectra showed that strong red (615 nm and 645 nm) and bright green (523 nm and 545 nm) emission bands were obtained, under excitation by laser at 488 nm at RT, for BZT-Pr and BZT-Er, respectively. These multifunctional materials showed a significant technological promise in coupling device applications.

Photoluminescence quenching and enhanced spin relaxation in Fe doped ZnO nanoparticles

Cost-effective ultrasonically assisted precipitation method is utilized to synthesize Zinc oxide (ZnO) nanoparticles (NPs) at room temperature and the effect of Iron (Fe) doping on structural, optical and spin relaxation properties also presented. As-synthesized pure and Fe doped ZnO NPs possess a perfect hexagonal growth habit of wurtzite zinc oxide, along the (101) direction of preference. With Fe doping, ‘c/a’ ratio and compressive lattice strain in ZnO NPs are found to reduce and increase, respectively. Raman studies demonstrate that the E1 longitudinal optical (LO) vibrational mode is very weak in pure which remarkably enhanced with Fe doping into ZnO NPs. The direct band gap energy (Eg) of the ZnO NPs has been increased from 3.02 eV to 3.11 eV with Fe doping. A slight red-shift observed with strong green emission band, in photoluminescence spectra, is strongly quenched in 6 wt.% Fe doped ZnO NPs. The field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) reveals spherical shape of ZnO NPs with 60–70 nm, which reduces substantially on Fe doping. The energy dispersive X-ray spectrum and elemental mapping confirms the homogeneous distribution of Fe in ZnO NPs. Moreover, the specific relaxation rate (R2sp = 1/T2) has been measured using Carr-Purcell-Meiboom-Gill (CPMG) method and found to be maximum in 6 wt.% Fe doped ZnO NPs. Further, the correlation of structural, optical and dynamic properties is proposed.

Upconversion luminescence of (Lu,M)NbO4:Yb3+,Er3+ (M: Al3+, Ga3+)

The effects of substitution of Al3+ and Ga3+ ions on the upconversion luminescence of (Lu,M)NbO4:Yb3+,Er3+ (M: Al3+, Ga3+) were studied for the first time. Under infrared (980nm) radiation, the upconversion spectra consisted of strong green and weak red emission bands, which were assigned to the transition of the 2H11/2/4S3/2 and 4F9/2 levels, respectively, to the ground state (4I15/2) of the Er3+ ions through an energy transfer process from Yb3+ to Er3+. A two-photon upconversion process was involved in the upconversion emission of (Lu,M)NbO4:Yb3+,Er3+. Substitution of Al3+ and Ga3+ ions increased the green (red) emission intensity to approximately 120% (120%) and 135% (130%), respectively. These behaviors were explained in terms of the crystal field asymmetry and energy transfer probability.

Self-assembly of lanthanide(iii) coordination polymers from a bifunctional 2-(pyridin-2-yl)-1H-imidazole-4,5-dicarboxylate ligand with the assistance of oxalate: syntheses, structures, luminescence, and magnetic properties

Based on a bifunctional 2-(pyridine-2-yl)-1H-4,5-imidazole-dicarboxylic acid ligand, a novel family of lanthanide coordination polymers with formulas [Ln(HPIDC)(C2O4)0.5(H2O)]n (Ln = La, 1; Ce, 2) and [Ln2(HPIDC)(C2O4)2(H2O)3]n·2nH2O (Ln = Pr, 3; Nd, 4; Sm, 5; Eu, 6; Gd, 7; Tb, 8; Dy, 9; Ho, 10; Er, 11), (H3PIDC = 2-(pyridine-2-yl)-1H-imidazole-4,5-dicarboxylic acid & H2C2O4 = oxalic acid) has been prepared under hydro-solvothermal conditions and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, and thermogravimetric analysis. Notably, the ligands adopt the same μ3-kN,O:kO′,O′′:kO′′′ conformation in all compounds, which brings about two types of isostructural lanthanide coordination polymers. Namely, 1 and 2 crystallize in the monoclinic space group P21/n and are composed of [Ln2(COO)2] dinuclear subunits with networks having the symbol (63·82·10)2(63)2(8). Meanwhile, 3–11 crystallize in the monoclinic space group P21/c and are constructed with tetranuclear [Ln4(COO)4] subunits with networks having the symbol (103)2(104·122)(10)2. The photoluminescence measurement indicates that Eu(III) and Tb(III) coordination polymers show very strong reddish-orange and green emission bands with CIE chromaticity coordinates (0.612, 0.325) and (0.284, 0.523) and quantum yields of 54.3% & 34.7%, respectively. The magnetic properties of 3 and 7–11 are investigated, and the results indicate a ferromagnetic interaction between Gd(III) magnetic centers in complex 7 and antiferromagnetic interactions in other complexes.

Synthesis of Microwave Sol–Gel Derived NaCaLa(WO4)3:Ho3+/Yb3+ Phosphors and Their Spectroscopic Properties

Ho3+/Yb3+ co‐doped NaCaLa1−x(WO4)3 ternary tungstates with the proper concentrations of doping for Ho3+ and Yb3+ (x = Ho3+ + Yb3+, Ho3+ = 0, 0.05, 0.1, and 0.2, and Yb3+ = 0, 0.2, and 0.45) were precisely synthesized using the sol–gel method assisted by the microwave technique; their upconverted spectroscopic properties were studied in detail. The particles provided well‐crystallized morphology with a homogeneous and fine morphology, showing the grain sizes of 2–5 µm. After the low excitation at 980 nm, the NaCaLa0.7(WO4)3:Ho0.1/Yb0.2 and NaCaLa0.5(WO4)3:Ho0.05/Yb0.45 ternary tungstates provided strong upconverted yellow emissions, which are based on a strong green emission band of 545 nm and a strong red emission band of 655 nm. The optimal Yb3+:Ho3+ ratio was obtained to be 9:1, as indicated by the composition‐dependent quenching effect of Ho3+ ions. The Raman spectra for the doped ternary tungstates showed the presence of strong peaks at higher frequencies, which were superimposed by strong Ho3+ luminescence lines. The dependence of pump power and Commission Internationale de L'Eclairage (CIE) chromaticity of the upconverted emission intensity was investigated in detail.

Luminescence of Er<sup>3+</sup>/Nd<sup>3+</sup> Co-Doped Lithium Niobate Tellurite Glass

Achieving tuneable photoluminescence via controlled co-doping of rare earth ions in lithium niobate based glasses are challenging. A series of Er3+/ Nd3+ co-doped tellurite glasses of composition (70-x-y) TeO2 – 15 Li2CO3 – 15 Nb2O5 – (x) Er2O3 – (y) Nd2O3 with x = 0; 1.0 mol % and 0 ≤ y ≤ 1.0 mol % are prepared using melt quenching technique. The influence of co-dopants on the emission properties is analyzed and discussed using partial energy level diagram of rare earth ions. The dopants concentration dependent physical properties such as refractive index, molar volume, density, polarizability and molar refractions are determined. The down-converted luminescence spectra for 2G9/2 à4I9/2 transition reveal a strong green emission band centred at 497 nm is attributed to the energy transfer from erbium to neodymium ion. The emission spectra exhibit five prominent peaks centred at 497, 539, 553, 616 and 634 nm corresponding to the transitions from 2H11/2, 4S3/2 and 4F9/2 excited states to the ground state of Er3+ ion and the transitions from 2G9/2, 2G7/2, 2H11/2 and 4F9/2 excited states to ground state of Nd3+ ion. The highest intensity is achieved for x = y = 1.0 mol%. The excellent luminescence response suggests that our glasses may be nominated for solid state lasers and other photonic applications.

Up-conversion Luminescence, Temperature Dependence and Ferroelectric Properties in Ho3+ and Yb3+ Co-Doped Bi3TiNbO9 Multifunctional Ceramics

Bi3TiNbO9 (BTN) is an important member of the Aurivillius bismuth layer-structured ferroelectric compounds, consisting of [Bi2O2]2+ layers between which [BiTiNbO7]2- layers are inserted. Ho3+ and Yb3+ co-doped Bi3TiNbO9 (BTN) ceramics were synthesized by a conventional solid state reaction method and their up-conversion (UC) luminescence and the ferroelectric properties were investigated. A strong green emission band centered at 547 nm, two weak red emission bands centered at 657 nm and 758nm were obtained under a 980 nm laser excitation at room temperature. With the increasing of Yb3+ content, the intensity of the up-conversion luminescence increased initially and then decreased due to concentration quenching. The fluorescence intensity ratio of green UC emission centered at 547 nm and red UC emission centered at 657 nm was studied as a function of temperature in a range of 123 - 573K, and the result showed a quite good linear variation of the two emissions with temperature, which indicates that Ho3+/Yb3+ co-doped Bi3TiNbO9 multifunctional ceramic is a promising candidate for applications in optical temperature sensors.

Synthesis of Ba2SiO4:Eu(2+) by a Hybrid Process and Its Luminescent Properties.

Ba2SiO4:Eu(2+) powders were prepared using a sol-gel-combustion (hybrid) process with tetraethyl orthosilicate (TEOS) and colloidal silica (C-SiO2) as Si sources. The effects of the silicon sources and preparation conditions on phase formation and luminescent properties were investigated. The B2S:Eu(2+) powders synthesized with TEOS were composed of the irregular particles, whereas C-SiO2 was more conducive to uniform particle distribution for the Ba2SiO4:Eu(2+) powders, leading to the enhancement of the emission intensity. The photoluminescence spectra of the synthesized powders exhibited broad excitation bands spanning 250 to 450 nm, and strong green-emission bands, whose intensities and positions were heavily dependent on the concentration of Eu(2+) and Sr(2+) substituted for Ba(2+) in Ba2SiO4.

Up-conversion luminescence and optical thermometry characterization of Ho<sup>3+</sup>/Yb<sup>3+</sup> co-doped SrBi<sub>4</sub>Ti<sub>4</sub>O<sub>15</sub> ferroelectric ceramics

Ho3+/Yb3+co-doped SrBi4Ti4O15 (SBT) ferroelectric ceramics were synthesized by conventional solid-state reaction method and their structural, up-conversion luminescent and dielectric properties were investigated in this study. The substitution of Ho3+ ion was fixed as 0.06 mol-1 and the amount of Yb3+ was 0 ≤ x ≤ 0.3. A strong green emission band centered at 547 nm, two weak red emission bands centered at 659 nm and 759nm were obtained under a 980 nm laser excitation at room temperature. With the increasing of Yb3+ content, the intensity of the up-conversion luminescence increased initially and then decreased due to concentration quenching. The green and red up-conversion emissions in the ceramics were two-photon processes. The fluorescence intensity ratio of green UC emission centered at 547 nm and red UC emission centered at 659 nm was studied as a function of temperature and the result showed a quite good linear variation of the two emissions with temperature, which indicates that Ho3+/Yb3+ co-doped SrBi4Ti4O15 multifunctional ceramic is a promising candidate for applications in optical temperature sensors.

Effects of Eu3+ and Tb3+ Activator Ions on the Properties of SrSnO3 Phosphors

SrSnO3 phosphor powders were synthesized with two different contents of activator ions Eu3+ and Tb3+ using thesolid-state reaction method. The structural, morphological, and optical properties of the phosphors were investigated using X-ray diffractometry, field-emission scanning electron microscopy, and fluorescence spectrophotometry, respectively. All thephosphors showed a cubic structure, irrespective of the type and the content ratio of activator ions. For Eu3+-doped SrSnO3phosphors, the intensity of the 620nm red emission spectrum resulting from the 5D0→7F2 transition of Eu3+ was stronger thanthat of the 595nm orange emission signal due to the 5D0→7F1 transition in the range 0.01-0.05mol of Eu3+, but the ratio ofthe intensity was reversed in the range 0.10-0.20mol of Eu3+. The variation in the emission intensity indicates that the sitesymmetry of the Eu3+ ions around the host crystal was changed from non-inversion symmetry to inversion. For the Tb3+-dopedSrSnO3 phosphors under excitation at 281nm, one strong green emission band at 550nm and several weak bands wereobserved. These results suggest that the optimum red and green emission signals can be realized when the activator ion contentfor Eu3+- or Tb3+-doped SrSnO3 phosphors is 0.20mol and 0.15mol, respectively.

Co-Doped ZnO Nanoparticles: Structural, Morphological, Optical, Magnetic and Antibacterial Studies

Un-doped and Co-doped ZnO nanoparticles (NPs) with different weight ratios (0.5, 1.0, 1.5, and 2.0 wt% of Co) were synthesized by a facile and rapid microwave-assisted combustion method using urea as a fuel. The prepared NPs were characterized by X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray analysis (EDX), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy and vibrating sample magnetometry (VSM). XRD patterns refined by the Rietveld method indicated that Co-doped ZnO had a single pure phase with wurtzite structure suggesting that Co2+ ions would occupy Zn2+ ionic sites within the ZnO crystal lattice. Interestingly, the morphology was found to convert substantially from grains to nanoparticles with close-packed periodic array of hexagonal-like shape and then into randomly distributed spherical NPs with the variation of Co-content. The optical band gap estimated using DRS was found to be red-shifted from 3.22 eV for the un-doped ZnO NPs then decrease up to 2.88 eV with increasing Co-content. PL spectra showed a strong green emission band thus confirming the formation of pure single ZnO phase. Magnetic studies showed that Co-doped ZnO NPs exhibited room temperature ferromagnetism (RTFM) and that the saturation magnetization attained a maximum value of 2.203 × 10−3 emu/g for the highest Co-content. The antibacterial studies performed against a set of bacterial strains showed that the 2.0 wt% Co-doped ZnO NPs possessed a greater antibacterial effect.

Up-conversion luminescence of Er3+ and Yb3+ co-doped CaBi2Ta2O9 multifunctional ferroelectrics

Er 3+ and Yb 3+ co-doped CaBi 2 Ta 2 O 9 (CBT)-based bismuth layered-structure oxides were synthesized by a simple solid-state reaction method. Their up-conversion (UC) luminescence, dielectric and ferroelectric properties were investigated. Two strong green emission bands centered at 526 and 547 nm and a weak red emission band centered at 658 nm were obtained under a 980 nm laser excitation at room temperature. These emission bands originated from the radiative relaxation of Er 3+ from 2 H 11/2, 4 S 3/2, and 4 F 9/2 levels to the ground state 4 I 15/2, respectively. At the meantime, the fluorescence intensity ratio (FIR) variation of two green UC emissions at 526 and 547 nm has been studied as a function of temperature in the range of 153–603 K. The maximum sensor sensitivity obtained was 39 × 10-4 K-1 at 590 K, which indicated that Er 3+/ Yb 3+ co-doped CBT ceramic is a promising candidate for applications in optical high temperature sensor.

Synthesis and luminescence of BiPO4:Ln3+ (Ln = Ce3+, Tb3+) phosphors

BiPO4:Ce3+ and BiPO4:(Ce3+, Tb3+) powders were synthesized by the method of precipitation. The X-ray diffraction patterns show that BiPO4:Ce3+ and BiPO4:(Ce3+, Tb3+) samples have pure hexagonal phases. The transmission electron microscopy results show that the synthesized samples are nanoparticles. Ethylene glycol plays an important role in the formation of nanoparticles. The excitation spectrum of BiPO4:Ce3+ sample shows the transition from the ground 2F5/2 state to the excited 5d states of the Ce3+ ions. The emission spectrum exhibits a strong band centered at 352 nm originating from the 5d → 4f transitions of the Ce3+ ions. The emission spectrum of the BiPO4:(Ce3+, Tb3+) sample contains both a weak emission band of the Ce3+ ions and strong green emission bands of the Tb3+ ions. The excitation and emission spectra show that there are energy transfers between Ce3+ and Tb3+ ions in the BiPO4:(Ce3+, Tb3+) sample. The energy transfers between Ce3+ and Tb3+ ions improve the emission efficiency of BiPO4:(Ce3+, Tb3+) sample.

CdS microflowers and interpenetrated nanorods grown on Si substrate: Structural, optical properties and growth mechanism

CdS semiconductor with different morphologies have been achieved by simple thermal evaporation of CdS powder at 1050 °C in a flowing Ar atmosphere. The products were characterized by X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy and Photoluminescence. microflowers and interpenetrative nanorods of CdS were formed on catalyst free Si wafers at a temperature of 700 °C and 600 °C respectively. The flower like structures are composed of many interleaving nanorods which have the uniform diameter of about 700 nm and a well crystalline structure with [0001] as growth direction. The interpenetrative nanorods are found to be bounded with six side facets. X-ray diffraction studies revealed the hexagonal structure in both the products. The formation mechanism of microflowers and interpenetrated nanorods was discussed on the basis of nucleation growth kinetics. Room temperature photoluminescence spectra showed a strong green emission band (at ∼510 nm) from the CdS flower like structures, but on the other hand a red emission shoulder along with strong green emission band was observed for interpenetrative nanorods. These CdS micro/nanostructures with abundant morphologies may find applications in various micro/nanodevices, and the kinetics-driven morphology might be exploited to synthesize similar structures of other functional II–VI semiconductors.

Near‐Infrared and Upconversion Luminescence in Er:Y2O3 Ceramics under 1.5 μm Excitation

Results of the spectroscopic characteristics and upconversion luminescence in Er3+ doped yttria (Y2O3) transparent ceramics prepared by a modified two‐step sintering method are presented. The near‐infrared (1.5 μm) luminescence properties were evaluated as a function of Er3+ concentration. Judd–Ofelt intensity parameters, radiative rates, branching ratios, and emission lifetimes were determined and compared with results reported for Er3+‐doped Y2O3 single crystal and nanocrystals. Following pumping at 1.532 μm, weak blue (~0.41 μm, 2H9/2 → 4I15/2), strong green (~0.56 μm, 2H11/2, 4S3/2 → 4I15/2), and red (~0.67 μm, 4F9/2 → 4I15/2) emission bands were observed as well as weak near‐infrared emissions at 0.8 μm (4I9/2 → 4I15/2) and 0.85 μm (4S3/2 → 4I13/2) at room temperature. The upconversion luminescence properties under ~1.5 μm pumping were further investigated through pump power dependence and decay time studies. Sequential two‐photon absorption leads to the 4I9/2 upconversion emission, whereas energy‐transfer upconversion is responsible for the emission from the higher excited states 2H9/2, 2H11/2, 4S3/2, and 4F9/2. The enhanced red emission with increasing Er3+ concentration most likely occurred via the cross‐relaxation process between (4F7/2 → 4F9/2) and (4I11/2 → 4F9/2) transitions, which increased the population of the 4F9/2 level.

Structural, Optical And Magnetic Properties Of (Fe, Ag) Co-doped ZnO Nanostructures

The (Fe, Ag) co-doped ZnO nanostructures are developed through chemical precipitation method at various percentages of Fe. The X-ray diffraction studies suggest that all the as-synthesized (Fe, Ag) doped ZnO nanopowders have single phase wurtzite structure with no secondary phases. However, the positions of diffracted peaks slightly shifted towards lower (2θ) angles. Photoluminescence studies reveal that 1 mol% of Fe doped ZnO sample has the best ultra violet (UV) emission properties than the other samples. On the other hand, 5 mol% of Fe doped ZnO nanopowders consists of strong green emission band, which belongs to oxygen interstitial defect states. Magnetization analysis shows that 5 mol% of Fe doped ZnO nanopowders have highest room temperature ferromagnetism (RTFM) than the RTFM of other samples. The observed RTFM in co-doped ZnO nanopowders is discussed with the help of structural and emission studies. The results strongly suggest the future development of efficient luminescence and magnetic materials at normal laboratory temperatures with (Fe, Ag) co-doped ZnO nanostructures.

Mushroom-like ZnO Nanostructures Grown on Tungsten Substrate

In this work, we have developed a facile but efficient method to prepare mushroom-like Zinc oxide (ZnO) nanostructures with a flat cap in the diameter of around 1m, by thermal evaporation of the mixture of ZnS and carbon powder on a tungsten substrate. The mushroom-like nanostructures were characterized by using advanced techniques such as scanning electron microscope (SEM), X ray diffraction (XRD) and Raman spectroscopy. The optical properties of such product were also investigated by photoluminescence spectroscopy, revealing a strong green emission band emerged, which may be attributed to the oxygen vacancies and various surface states. Finally the formation and growth mechanisms for the mushroom-like ZnO nanostructures were proposed and discussed. Keywords: Nanostructures, optical property, thermal evaporation, ZnO.

Surfactant-free hydrothermal synthesis and optical properties of ZnS solid microspheres

In this report, ZnS solid microspheres have been successfully obtained through a surfactant-free hydrothermal method. The obtained ZnS solid microspheres were characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). The SEM results reveal that the diameter of ZnS solid microspheres is from several hundreds of nanometers to about 2µm. Optical properties of the ZnS solid microspheres were investigated by UV–vis absorption spectrum and room temperature photoluminescence (PL) spectrum. UV–vis absorption spectrum shows that the ZnS solid microspheres have a strong absorption peak centered at 337nm. Room temperature PL spectrum shows that the as obtained ZnS solid microspheres have an obviously strong green emission band at 522nm. At the same time, the formation mechanism of the ZnS microsphere was proposed based on the experimental process.