Synthesis of Highly Emissive Mn-Doped ZnSe Nanocrystals without Pyrophoric Reagents

Abstract

Manganese-doped zinc selenide quantum dots (Mn:ZnSe d-dots) with high optical quality, pure dopant emission with 40-60% photoluminescence quantum yield, were synthesized with air-stable and generic starting materials, namely zinc (manganese) fatty acid salts with corresponding free fatty acids, Se powder, fatty amine, and octadecene. The pyrophoric, highly toxic, and expensive organophospines were eliminated from the existing synthetic protocols for high quality Mn:ZnSe d-dots, which changed the reaction profile substantially mainly because of the enhanced reactivity of elemental Se with the presence of fatty amines. The reaction temperatures for two key processes involved in "nucleation-doping", namely, formation of MnSe nanoclusters and their overcoating by the host, were both reduced. Multiple injection techniques were employed to realize balanced diffusion of the Mn ions in the d-dots. The resulting d-dots were found to be in zinc-blende crystal structure, with optimal spherical shape, nearly monodispersed, and controlled in their Mn:Zn ratio.

Optical down-conversion in doped ZnSe:Tb3+nanocrystals

“…The asgrown ZnSe nanocrystals were puried by successive precipitation and decantation cycles for at least two times using acetone and hexanes following the standard literature method. 5 Finally, the puried nanocrystals were suspended in hexanes for further characterization.…”

Simulation-Based Optical Spectra Analyses and Synthesis of Highly Monodispersed Mn-Doped ZnSe Nanocrystal

“…28 On account of their potential applications, Mn:ZnSe d-dots, clusters have been investigated via theoretical calculations 29,30 and experiments. [1][2][3][4][31][32][33] Many scholars have investigated it through di®erent approaches. Singh et al 29 study¯rst-principles theoretical analysis of transition-metal doping of ZnSe quantum dots.…”

“…Peng's group 3 conducted Mn:ZnSe ddots using nucleation-doping strategy which was TBPSe used as selenium precursor. Recently, Se-ODE solution in various forms was explored to eliminate the toxic and environmental malign Seorganophosphine precursor; Peng et al 33 synthesized Mn:ZnSe d-dots by using Se-ODE as a replacement for TBPSe. Zeng et al…”

Synthesis, characterization and optical properties of cobalt and lanthanide doped CdS nanoparticles

“…A considerable interest has been paid to doped nanoparticles with suitable optically active impurities such as transition metal ions and trivalent rare earth ions as it creates new possibilities for property modification and application of nanoparticles [13][14][15][16][17][18][19][20]. These dopant impurities play an important role in changing the electronic structures and transition probabilities of the host material.…”

“…These dopant impurities play an important role in changing the electronic structures and transition probabilities of the host material. Doped nanoparticles are expected to offer a new class of nanomaterials with properties different from bulk materials such as high quantum luminescence efficiency [13,14], high temperature stability [17], long luminescence lifetimes [18] and dopant dependent tunable emission [20]. There have been a few reports on Mn doped CdS with green-yellow-orange luminescence [21] and orange-red luminescence in Cu doped CdS nanoparticles [22,23].…”