Luminescence properties of blue–red emitting multilayer coated single structure ZnS/MnS/ZnS nanocomposites

Manganese Sulfide (MnS) Nanocrystals: Synthesis, Properties, and Applications

“…In this manner, the synthesis of MnS NCs would not rely on the complex redox chemistry to produce sulfide anions from elemental sulfur. For instance, hydrated sodium sulfide has been employed in the synthesis of ZnS@MnS@ZnS heterostructures by co-precipitation with metal acetates in a hydroalcoholic medium (see Section 2.1.2) [6]. However, inorganic sulfides are poorly soluble in apolar solvents, which limits their application in solvothermal synthesis.…”

“…Aiming at improving the optical properties of these MnS@ZnS nanosystems, ZnS@MnS@ZnS heterostructures were synthesized by a three-step hydroalcoholic co-precipitation protocol [6]. To a solution of Zn(II) acetate dihydrate (25 mmol) in an ethanol/water 1:1 mixture, a hydroalcoholic solution of Na 2 S (25 mmol) was added dropwise and a white precipitate formed.…”

“…The PL of β-MnS nanosystems received some attention. The photoluminescence excitation (PLE) spectra, obtained by monitoring the intensity of the PL while varying the excitation wavelength, showed several well-resolved peaks attributed to the transition from the ground 6 A 1 state to the excited states of Mn 2+ ions. Interestingly, the 6 A 1 → 4 T 2 (4D) transition undergoes a shift at temperatures below the Néel temperature of the bulk material revealing the strong correlation between the energy of the Mn-internal optical transitions and the magnetic transition from the paramagnetic state to the antiferromagnetic state.…”

“…Manganese(II) sulfide (MnS) is a p-type semiconductor with a wide bandgap (E g = ~3 eV) [1] that undergoes a transition to an antiferromagnetically (AFM) ordered phase below room temperature [2]. These features attracted interest for the potential applications of nanosized MnS in the field of short wavelength optoelectronics [3][4][5], or as a photoluminescent component [6], photoreduction catalysts [7], and contrast agent for magnetic resonance imaging (MRI) [8,9]. The optical properties of MnS have also raised considerable interest in protobiology since it is deemed to have played a key role (along with ZnS in mixed haloes formed around primeval sub-aerial hot springs) in the prebiotic photosynthesis development, thanks to its ability to photoreduce CO 2 [7].…”

Preparation of metal sulfide mixtures in montmorillonite by solid–solid reactions

“…A large number of surface defects, instability during prolonged light irradiation (Jia et al, 2011), as well as low quantum yield (Rajeshwar et al, 2001) have been proposed as drawbacks, which limit the optical applications. To overcome the limitation of the semiconductors, synthetic effort has been devoted to control the structure and particle size using a variety of methods such as mixing of semiconductors (Ge et al, 2011;Viswanath et al, 2014) and doping foreign metal ion (Yang et al, 2012;Labiadh et al, 2013), surface capping as well as immobilization on effective media or supports including polymer, layered inorganic solids and so forth (Kotov et al, 1993;Dékány et al, 1995Dékány et al, , 1999aSzabó et al, 2003;Maity et al, 2006;Miao et al, 2006;Nascimento et al, 2012;Praus et al, 2013;Soltani et al, 2013;Sharma and Gosavi, 2014). Besides the preparation of single metal sulfide, metal sulfide mixtures have been studied because the combination of characteristic of each metal sulfide provided the modified properties due to newly created electronic structure and/or morphology (Hsu et al, 2005;Zheng et al, 2009;Raubach et al, 2012).…”