The Low-Temperature Synthesis and Optical Properties of Near-White Light Emission Nanophosphors Based on Manganese-Doped Zinc Sulfide

Abstract

Manganese-doped zinc sulfide as a nano scale phosphor has been prepared via a solid-state reaction employing zinc acetate, manganese acetate and thioacetamide (TAA). At a synthesis temperature of 100-300 C, the structure of 2 mol % Mn 2þ -doped ZnS nanoparticles was cubic, as identified from X-ray diffraction (XRD) patterns. Four temperatures were adopted to synthesize 2 mol % Mn 2þ -doped ZnS with particle sizes ranging from 3.9 to 7.0 nm. According to the quantum size effect, the increases in ZnS band-gap energy (calculated from photoluminescence excitation spectra and the Brus formula) were examined, and similar tendencies were obtained in the results of the two methods. From the photoluminescence (PL) spectra, two emission bands (blue-light emission and orange-light emission) were observed. The blue-light emission band resulted from the energy level of the ZnS matrix, and the orange-light emission band was assigned to the 4 T 1 ! 6 A 1 transition of a Mn 2þ ion in a ZnS matrix. By controlling the synthesis temperature, the ratio of the two light-emission intensities was tuned by increasing the excitation surface of ZnS matrix material. According to Commission Internationale de L'clairage (CIE) coordinates, a near-white-light emission was observed by this simple and rapid method.

Properties of thin ZnS:Mn films sprayed by improved method: The role of Mn2+ ion concentration

“…Proper accommodation of Mn atoms at substitutional sites is essential to generate Mn 2+ luminescent centers; Zn vacancies would be filled by Mn atoms. The ∼2.10 eV emission band is attributed to 4 T 1 → 6 A 1 transition within 3d shell of Mn 2+ ion [11,52,53]. The intensity of the PL of the thin films peaked at ∼2.53 eV is maximum initially and then decreases, while the intensity of the PL peaked at ∼2.10 eV initially increases rapidly to the maximum and then decreases slowly with the increase in Mn concentration.…”

One-step synthesis of ZnO nanosheets: a blue-white fluorophore

“…These include ‘magic-sized’ CdSe [1] and a large variety of other materials in nano-particulate format, including CdSeS [2], Mn-doped ZnS [3], Mn-doped ZnSe [4], Ce 3+ -doped Y 3 Al 5 O 12 [5], doped YVO 4 :Ln 3+ , and silica-coated YVO 4 :Ln 3+ , where Ln 3+ = Eu 3+ , Dy 3+ , or Tm 3+ [6] mixtures of rare earth phosphors [7] and rare earth-doped GdF 3 [8]. In addition, another class of coating materials currently attracting attention is that of wide band-gap semiconductors such as Ga 2 O 3 [9], In 2 O 3 [10], and ZnO.…”

Synthesis and Characterization of Co²⁺ Ions Doped ZnS-CdS Composite Nanopowder

“…A sharp ye llo w e missio n at 532 nm (2.33eV) is attrib uted to the characteristic of cobalt [40]. A red emiss ion at 680nm (1.87eV) confir ms the CdS peak [41] and the sharp and most inte nse peak at 735nm (1.69eV) gives orange-red emiss io n in the NIR regio n [42,[43][44][45]. In general, the role of surface quality, sur face defects of the compos ite mater ial is ver y important in ter ms of emiss ion characteristics towards the optical applicatio n. The stoic hio metr ic defects at electronic leve ls are influe nced by photoluminescence in II-VI semico nductors.…”