Optical properties of Sm-doped ZnS nanocrystals

Synthesis and properties of transition metals and rare-earth metals doped ZnS nanoparticles

“…Huang et al [77] fabricated the single layer LED used the ZnS:Cu 2+ nanocrystals/polymer composite, the device had low turn on voltage and the blue electroluminescent was observed at room temperature. Kushida and Kurita et al [52,53] discovered a new kind of optical data storage. Dinsmore et al [55] prepared the ZnS:Mn 2+ copped with ZnO nanoparticle with high cathodoluminescence (CL) intensity.…”

“…A few papers reported on the luminescence of rare-earth ions absorbed on the nanocrystalline semiconductor surface [35] or nanocrystalline semiconductor absorbed on rare-earth containing species [67,68] and Bol et al [39] used the old and new synthesis methods to prepare ZnS:Eu 3+ , CdS:Eu 3+ , ZnS:Tb 3+ , and ZnS:Er 3+ nanocrystalline, their results has shown that the rare-earth ions were not incorporated in the ZnS host lattice. Kushida and Kurita et al [52,53], discovered a new kind of optical memory effect in Sm doped ZnS nanocrystals, they explained the results by assuming that Sm is divalent in their in their samples. However, Liu et al [38] detected that the characteristic emission of Tb 3+ ions in ZnS:Tb 3+ sample is in part excited by the absorption of ZnS nanomatrix, which indicates the energy transfer between Tb 3+ and nanometer ZnS.…”

“…So, a major goal is to characterize the surface states and to control them chemically [4,5,29]. Recently, methods have been developed to cap the surfaces of the nanoparticles with organic or inorganic groups so that the nanoparticle is stable against agglomeration, some particular passivators has been used such as polyethylene glycol (PEG) and pyrocatechol violet (PV) [30], acrylic acid (AA) [31], methacrylic acid (MA) [18,[32][33][34][35][36][37][38], mixture of poly(oxyethylene)5nonylphenol(NP-5) and poly(oxyethylene)9nonylphenol-(NP-9) [39,40], sodium polyphosphate (PP) [32][33][34]39,[41][42][43][44][45][46][47][48], poly(vinylalcohol) (PVA) [32,33,49,50], poly(vinylbutryral) (PVB) [32,33,51], pentafluorothio-phenol [52,53], poly(acrylic acid) (PAA) [31], dioctylsulfosuccinate sodium salt (AOT) [54,55], thioglycerol (TG) [56], mercaptoethanol [57], dodecyl benzene sulfonic acid sodium salt (DBS) [58]. Suitable surfactants not only against agglomeration but also improve some optical properties of the nanoparticles.…”

Synthesis and Characterization of PVP capped Er and Cu codoped ZnS Nanoparticles

“…Zinc sulfide (ZnS) as an important wide-band gap (3.6 eV) semiconductor has been used as a key material in ultraviolet light-emitting diodes and injection lasers, flat-panel displays, electroluminescent devices and infrared windows [1,2]. The rapid advancement in nanotechnology and biotechnology, particularly the development of new methods for materials synthesis, force towards the controlled synthesis, optical properties, magnetic properties and bio-applications of rare-earth ions doped materials on the nano-scale.…”

Analysis of the effect of annealing on the photoluminescence spectra of Cu+ ion implanted ZnS nanoparticles

“…By taking advantage of developments in preparation methods, both transition metal ions and rare earth ions have been doped into ZnS nanoparticles. Examples include ZnS:Mn [10][11][12], ZnS:Ag [18], ZnS:Ni [19], ZnS:Co [20], ZnS:Sm [21], ZnS:Eu [22], ZnS:Tb [23] and ZnS:Cu [14][15][16][17], the last one being the focus of the present study. Nanosized ZnS:Cu finds extensive applications in electroluminescent devices [4] and this material is identified as a good cathode ray tube (CRT) phosphor [14].…”