Luminescent and Magnetic Properties in Semiconductor Nanocrystals with Radial-Position-Controlled Mn²⁺ Doping

Abstract

Colloidal nanocrystals (NCs) with radial-position-controlled doping were synthesized to study the effect of the binding symmetry around Mn2+ dopant. For the four samples ZnSe:Mn/ZnSe, ZnSe/ZnS(2 ML):Mn/ZnS(2 ML), ZnSe/ZnS(1 ML):Mn/ZnS(2 ML), and ZnSe:Mn/ZnS(2 ML), which were in sequence of binding asymmetry around Mn2+ dopant, their photoluminescent (PL) peak showed gradual red-shift (579 to 599 nm) and the PL lifetime became monotonously shorter (0.57 to 0.31 ms), while, as indicated in the electronic paramagnetic resonance spectra, the hyperfine splitting constant became larger (67.9 to 68.4 G) and the g factor became smaller (2.0076 to 2.005). The relation between the luminescent and magnetic properties of the Mn-doped NCs was discussed.

Long-lived and Well-resolved Mn2+ Ion Emissions in CuInS-ZnS Quantum Dots

“…Figure 2(d) presents a typical EPR spectrum of the as-synthesized Mn 2+ -doped CIS-ZnS QDs. The hyperfine coupling constant (A) of 63 Gauss calculated from Figure 2(d), is very close to Mn 2+ embedded in ZnS NC matrix (64.5 Gauss)29, suggesting that the Mn 2+ ions have been successfully incorporated into the QDs. However, the broadening of the peak, rather than the six clear hyperfine splittings, is expected due to the complex environment of the Mn in the presence of copper192021.…”

The Photoluminescent and Magnetic Properties of Mn2+ Ions at the Interface of Core/Shell Mn-Doped Nanocrystals

“…Our previous work has investigated the relationship between crystal filed and covalency by Mn-doped NCs with different binding symmetry [8]. To a certain degree, this structure-dependent result clarified the relationship mentioned above.…”

“…Nanocrystals (NCs) have been wildly studied due to the properties different from bulk materials [1][2][3]. Researchers focus on doped NCs for some excellent performances compared with un-doped NCs [4][5][6][7][8]. As one kind of doped NCs, Mn-doped NCs have gain great attention due to their Photo Luminescent (PL) properties and been used for devices manufacturing [9,10].…”

“…The values of superfine splitting constant (A) of EPR spectra can evidence the position of Mn 2+ ions [12,19,20]. Additionally, the EPR spectra also demonstrate the covalency between the anion and cation [8,21]. Larger value of A suggested weaker covalency [12,20,21].…”

Optical, electrochemical and thermal properties of Mn2+ doped CdS nanoparticles

“…Previous EPR studies reveal that if Mn 2? ions are present in the core region, hyperfine splitting constant value would be around 65G [38][39][40]. The present value of hyperfine splitting (71G) suggests that Mn 2?…”