Efficient manganese luminescence induced by Ce3+-Mn2+ energy transfer in rare earth fluoride and phosphate nanocrystals.

Yun Ding,Ding-Fei He,Min Li,Xue-Feng Yu,Pan Wang,Liang-Bo Liang,Liang Xu

doi:10.1186/1556-276x-6-119

Abstract

Manganese materials with attractive optical properties have been proposed for applications in such areas as photonics, light-emitting diodes, and bioimaging. In this paper, we have demonstrated multicolor Mn2+ luminescence in the visible region by controlling Ce3+-Mn2+ energy transfer in rare earth nanocrystals [NCs]. CeF3 and CePO4 NCs doped with Mn2+ have been prepared and can be well dispersed in aqueous solutions. Under ultraviolet light excitation, both the CeF3:Mn and CePO4:Mn NCs exhibit Mn2+ luminescence, yet their output colors are green and orange, respectively. By optimizing Mn2+ doping concentrations, Mn2+ luminescence quantum efficiency and Ce3+-Mn2+ energy transfer efficiency can respectively reach 14% and 60% in the CeF3:Mn NCs.

Highlights

The preparation of fluorescent nanomaterials continues to be actively pursued in the past decades
The above absorption peaks’ wavelength of the CeF3:Mn NCs are in good agreement with those reported for Synthesis of CePO4:Mn nanocrystals In a typical procedure, x mL of 0.2 M MnCl2 and (12-x) mL of 0.2 M CeCl3 were mixed
Morphology and structure Both the CeF3:Mn and the CePO4:Mn NCs were synthesized by effective hydrothermal processes

Summary

Introduction

The preparation of fluorescent nanomaterials continues to be actively pursued in the past decades. Great efforts have been devoted to Mn2+-doped semiconductor nanocrystals [NCs] due to their efficient sensitized luminescence [6,7]. Compared with the undoped materials, the Mn2+-doped semiconductor NCs often have higher fluorescence efficiency, better photochemical stability, and prolonged fluorescence lifetime. UV light excitation, both the CeF3:Mn and CePO4:Mn show bright Mn2+ luminescence in the visible region. Their fluorescence output colors, are quite different owing to different host crystal structures. The above absorption peaks’ wavelength of the CeF3:Mn NCs are in good agreement with those reported for Synthesis of CePO4:Mn nanocrystals In a typical procedure, x mL of 0.2 M MnCl2 and (12-x) mL of 0.2 M CeCl3 were mixed. The photoluminescence [PL] and PL excitation [PLE] spectra were recorded by a Hitachi F-4500 fluorescence spectrophotometer with a Xe lamp as the excitation source

Results and discussion

Conclusions

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