Tuning luminescence of 3d transition- metal doped quantum particles: Ni+2: CdS and Fe+3: CdS

AUTOR(ES)

Taheri, S. M., Yousefi, M. H., Khosravi, A. A.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2010-09

RESUMO

The room- temperature photoluminescence of Cd1- xMxS (M=Ni, Fe) nanoparticles were investigated. Compared with the photoluminescence of CdS which peaks at 475 nm, the photoemission of CdS:Fe nanoparticles was peaking at 537 nm because of Fe acting as luminescent centers. On the other hand, the green emission (503 nm) of CdS:Ni attributed to the ¹T2g(D)→ ³A2g(F) raditive transition. With the increase of the Ni+2 concentration, photoluminescence intensity is increased while by Fe replacement with Cd ions, PL intensity is decreased. Relative to bulk crystals, due to the quantum confinement effect the band gap of CdS clusters is significantly blue- shifted with decreasing cluster size. CdS nanoclusters present a mixed hexagonal/cubic structure and with increasing doping concentration the peaks position of doped CdS shifts to higher angle.

Documentos Relacionados

• NANOCOMPÓSITOS BASEADOS EM QUANTUM DOTS DE CdS E CdS:Cu SUPORTADOS EM MERCAPTOPROPILSÍLICA:síntese, caracterização e aplicação em fotocatálise.
• Acid Leaching-Based Synthesis of CdS Yellow Ceramic Pigment with Discarded Ni-Cd Batteries
• Surface properties of CdS nanoparticles
• 3D Shape analysis using 1D, 2D and 3D wavelets
• Room temperature measurements of the 3D orientation of single CdSe quantum dots using polarization microscopy