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Hoa, Tran Thi Quynh; The, Ngo Duc; McVitie, Stephen; Nam, Nguyen Hoang; Vu, Le Van; Canh, Ta Dinh; Long, Nguyen Ngoc
Optical materials, January 2011, 2011-01-00, 20110101, Letnik: 33, Številka: 3Journal Article
Undoped 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±0.011Ǻ. The PL spectra of Mn-doped ZnS nanoclusters at room temperature exhibit both the 495nm blue defect-related emission and the 587nm 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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