Synthesis, optical properties, and superlattice structure of Cu(I)-doped CdS nanocrystals

Abstract

High quality Cu͑I͒-doped CdS ͓CdS:Cu͑I͔͒ nanocrystals were synthesized by thermolysis of metal acetylacetonate complexes in n-dodecanethiol. The optical emission of the doped nanocrystals was observed to change from surface trap-dominant emission to Cu͑I͒-dominant emission with respect to the reaction time and the doping levels of Cu͑I͒ ions in CdS particles. The maximum photoluminescence quantum yields of the CdS:Cu͑I͒ nanocrystals could reach 15.8%. More interestingly, these doped nanocrystals could self-assemble into highly ordered superlattices depending on the doping levels of the Cu͑I͒ ions. A possible explanation for the formation of the CdS:Cu͑I͒ nanocrystal superlattices is dipole-dipole interactions between the adjacent nanocrystals.

One-pot aqueous synthesis of composition-tunable near-infrared emitting Cu-doped CdS quantum dots as fluorescence imaging probes in living cells

“…have been reported, but none of them has been used as living cellular imaging agents so far. 20,[22][23][24][25] They were mostly synthesized in organic solvents such as octadecene (ODE) and trioctylphosphine (TOP), and were prepared via a strategy of growth-doping or surface-doping. The process of phase transfer and purification for further application in biological field could lead to quenching of the photoluminescence (PL) of the d-dots because the dopant center is located close to the surface of the particles.…”

Schottky junction UV photodetector based on CdS and visible photodetector based on CdS:Cu quantum dots

“…For the Cu doped CdS sample red shift is clear as absorption starts at ~350 nm. The red shift in the absorption peak is strongly associated with the doping levels of Cu ions in the lattice of CdS [7]. Band gap has been assessed by using the Tauc's relation [8] hνα= A (hν-E a ) ½ (1) Where A is a constant, E a is band gap of the nanoparticles.…”

Growth of Green and Blue Luminescent Cu Doped CdS Nanorods and Their Optical Structural Characterization

“…Among various II-VI inorganic semiconductor nanocrystals, CdS nanoparticles are proved to be the most versatile materials as their wide applications in optoelectronic devices like thin-film light emitting devices, solar cells and biological labels. CdS quantum dots have been prepared by different researcher using various techniques such as chemical bath deposition, molecular beam epitaxy, spray pyrolysis, physical vapor deposition and sol-gel method [3][4][5]. Sol-gel method includes atom-level mixing reported to be more suitable to synthesize quantum dots.…”

“…Thermal, photochemical stability and emission activity can be improved by modifying the properties of semiconductor [4]. However very few works have been reported on copper doped CdS [5,6], even with small quantities of Cu have ability to tune the band gap of CdS nanocrystals which result in additional emission centers depending on their concentration and variations in the Photoluminescence (PL) and photoconductive properties make them suitable for wide range of applications such as light emitting displays and optical sensors [7][8][9]. In this paper we have reported high quality Cu:CdS nanocrystals by the sol-gel method.…”