Enhancement of luminescent properties of ZnS:Mn nanophosphors by controlled ZnO capping

Abstract

To establish a reliable procedure for the characterization of luminescence from nanomaterials, the cathodoluminescence CL observation conditions, such as the packing density of particles and the electron beam energy for irradiation, were examined by using ZnO nanoparticles. The evolutions of the intensities and peak position with the accelerating voltage are strongly affected by the packing density of particles. For the low-density specimen, the band edge emission reaches a maximum at 4 kV where the excitation of each nanoparticle becomes the most effective. On the other hand, the position of band edge emission does not shift for low-density specimen while it changes for high-density specimen. Such artifact may bring serious modifications to the CL data. This work suggests that the specimen preparation and the optimum excitation conditions are the keys for the reliable CL characterization of nanomaterials.

Photoluminescence and field emission properties of ZnS:Mn nanoparticles synthesized by rf-magnetron sputtering technique

“…Recently, ZnS nanobelts synthesis via chemical bath deposition (CBD) within the self-organized pores of PVA was reported by us [19]. The luminescence properties of doped ZnS have also been studied by different workers [20][21][22][23][24][25][26][27][28][29][30][31][32] synthesized via different routes. But to our knowledge there is no reports on the preparation of Mn doped ZnS nanoparticles via rf-magnetron sputtering technique and also the finding of its field emission property.…”

Photophysical and photoluminescence properties of co-activated ZnS:Cu,Mn phosphors

“…It is widely used as the active layer of both alternating and direct current thin film electroluminescence (TFEL) device and powder type EL device [14]. PL properties of single-metal-activated ZnS:Cu and ZnS:Mn phosphors are studied extensively [6,7,[15][16][17][18]. ZnS:Cu shows green and/or blue broad bands centered at $520 and 440 nm, respectively [19], while ZnS:Mn phosphor usually exhibits single-band emission with a maximum at about 580 nm [20].…”

Luminescence Enhancement of ZnS:Cu Nanocrystals by Zinc Sulfide Coating with Core/Shell Structure

“…The semiconductor NCs, passivated by inorganic materials with wide bandgap, have been developed and shown dramatically enhanced properties [24]. Enhanced luminescence properties has been observed in ZnS/SiO 2 NCs [25], CdSe/ZnS NCs [6], ZnS:Mn/ZnO NCs [26], and ZnS:Mn/Zn(OH) 2 NCs [27]. However, until now, there is few research on passivated ZnS:Cu materials.…”