Optical properties of Mn-doped ZnS semiconductor nanoclusters synthesized by a hydrothermal process
2010; Elsevier BV; Volume: 33; Issue: 3 Linguagem: Inglês
10.1016/j.optmat.2010.09.008
ISSN1873-1252
AutoresTrần Thị Quỳnh Hoa, Nguyen Ngoc Long, S. McVitie, Hoang Nam Nguyen, Le Van Vu, Ta Dinh Canh, Nguyen Ngoc Long,
Tópico(s)Copper-based nanomaterials and applications
ResumoUndoped and Mn-doped ZnS nanoclusters have been synthesized by a hydrothermal approach. Various samples of the ZnS:Mn with 0.5, 1, 3, 10 and 20 at.% Mn dopant have been prepared and characterized using X-ray diffraction, energy-dispersive analysis of X-ray, high resolution electron microscopy, UV–vis diffusion reflection, photoluminescence (PL) and photoluminescence excitation (PLE) measurements. All the prepared ZnS nanoclusters possess cubic sphalerite crystal structure with lattice constant a = 5.408 ± 0.011 Ǻ. The PL spectra of Mn-doped ZnS nanoclusters at room temperature exhibit both the 495 nm blue defect-related emission and the 587 nm orange Mn2+ emission. Furthermore, the blue emission is dominant at low temperatures; meanwhile the orange emission is dominant at room temperature. The Mn2+ ion-related PL can be excited both at energies near the band-edge of ZnS host (the UV region) and at energies corresponding to the Mn2+ ion own excited states (the visible region). An energy schema for the Mn-doped ZnS nanoclusters is proposed to interpret the photoluminescence behaviour.
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