Abstract
Mn-doped ZnS nanocrystals based on low dopant concentrations (0–2%) and coated with a shell of Zn(OH)2 have been prepared via soft template and precipitation reaction. The results indicate that the ZnS:Mn nanocrystal is cubic zinc blende structure and its diameter is 3.02 nm as demonstrated by XRD. Measured by TEM, the morphology of nanocrystals is a spherical shape, and their particle size (3–5 nm) is similar to that of XRD results. Photoluminescence spectra under ultraviolet region shows that the volume ratio of alcohol to water in the template has a great effect on the luminescence properties of ZnS:Mn particles. Compared with unpassivated ZnS:Mn nanocrystals, ZnS:Mn/Zn(OH)2 core/shell nanocrystal exhibits much improved luminescence and higher absolute quantum efficiency. Meanwhile, we simply explore the formation mechanism of ZnS:Mn nanocrystals in alcohol and water system and analyze the reason why alcohol and water cluster structures can affect the luminescent properties of nanoparticle.
Highlights
The preparation and characterization of II–VI nanoscale semiconductor compounds have attracted much attention over the past few years due to their fundamental properties [1] and applications, mostly as tunable emitters for biomedical labeling [2], light emitting diodes (LED), lasers, and sensors [3,4,5]
Mn-doped ZnS nanocrystals based on low dopant concentrations (0–2%) and coated with a shell of Zn(OH)2 have been prepared via soft template and precipitation reaction
We focus on preparation of stabilized Mn-doped ZnS nanocrystals by soft template method and coated Zn(OH)2 shells through precipitation reaction
Summary
The preparation and characterization of II–VI nanoscale semiconductor compounds have attracted much attention over the past few years due to their fundamental properties [1] and applications, mostly as tunable emitters for biomedical labeling [2], light emitting diodes (LED), lasers, and sensors [3,4,5]. ZnS has attracted more attention due to its interesting optical, electric properties, and large quantum efficiencies depending on its size. It can be used as a higher band gap material to passivate other quantum semiconductor heterostructure to increase their quantum yields [13]. The properties of the photoluminescent and electroluminescent materials could be greatly affected by doping concentration of Mn. The Mn ion, used as a dopant in many luminescent materials, has a d5 configuration that exhibits a broad emission peak, and its position strongly depends on the host lattice, which lies on the change in strength of crystal field with host. To obtain nanometer-sized particles, a variety of methods have been proposed, including microemulsion method [14], sol–gel processing [15], competitive reaction chemistry method [16], and aqueous chemical method [17]
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