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

Ding Y, Liang LB, Li M, He DF, Xu L, Wang P, Yu XF - Nanoscale Res Lett (2011)

Bottom Line: Manganese materials with attractive optical properties have been proposed for applications in such areas as photonics, light-emitting diodes, and bioimaging.CeF3 and CePO4 NCs doped with Mn2+ have been prepared and can be well dispersed in aqueous solutions.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Luoshi Road, Wuhan 430072, China. yxf@whu.edu.cn.

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.

No MeSH data available.


PLE and PL spectra. PLE and PL spectra of CeF3:Mn (a) and CePO4:Mn (b) NCs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211164&req=5

Figure 4: PLE and PL spectra. PLE and PL spectra of CeF3:Mn (a) and CePO4:Mn (b) NCs.

Mentions: Figure 4a schematically depicts the Ce3+-Mn2+ energy transfer process in the CeF3:Mn NCs, which efficiently induces a bright green luminescence under UV irradiation at RT. The RT PL emission spectra (with excitation wavelength λex = 260 nm) of the CeF3:10%Mn NCs contain not only the strong Mn2+ emission at 498 nm but also the Ce3+ emission at 325 nm. As known, the Mn2+ 6A1g(S)-4Eg(D) and 6A1g(S)-4T2g(D) absorption transition is respectively at 325 and 340 nm [18]; both of these absorption bands are overlapped by the Ce3+ emission. This overlap facilitates the energy transfer from Ce3+ to Mn2+, resulting in the characteristic 4T1g(G)-6A1g(S) emission of Mn2+ [25,26]. Such Ce3+-Mn2+ energy transfer is induced by the electric dipole-quadrupole interaction between the Ce3+ sensitizers and Mn2+ acceptors [19]. Furthermore, in Figure 4a, only the RT excitation peak ascribed to the Ce3+ 4f-5d transition can be observed at 260 nm, while the Mn2+ characteristic peaks cannot be witnessed because the Mn2+ absorption transitions are forbidden by spin and parity for electric dipole radiation as T > 200 K [27]. Since the RT Mn2+ luminescence is very difficult to be found in the transition-metal concentrated materials like MnF2 [27], the Ce3+-Mn2+ energy transfer offers an efficient route for obtaining Mn2+ RT luminescence in nanomaterials.


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

Ding Y, Liang LB, Li M, He DF, Xu L, Wang P, Yu XF - Nanoscale Res Lett (2011)

PLE and PL spectra. PLE and PL spectra of CeF3:Mn (a) and CePO4:Mn (b) NCs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211164&req=5

Figure 4: PLE and PL spectra. PLE and PL spectra of CeF3:Mn (a) and CePO4:Mn (b) NCs.
Mentions: Figure 4a schematically depicts the Ce3+-Mn2+ energy transfer process in the CeF3:Mn NCs, which efficiently induces a bright green luminescence under UV irradiation at RT. The RT PL emission spectra (with excitation wavelength λex = 260 nm) of the CeF3:10%Mn NCs contain not only the strong Mn2+ emission at 498 nm but also the Ce3+ emission at 325 nm. As known, the Mn2+ 6A1g(S)-4Eg(D) and 6A1g(S)-4T2g(D) absorption transition is respectively at 325 and 340 nm [18]; both of these absorption bands are overlapped by the Ce3+ emission. This overlap facilitates the energy transfer from Ce3+ to Mn2+, resulting in the characteristic 4T1g(G)-6A1g(S) emission of Mn2+ [25,26]. Such Ce3+-Mn2+ energy transfer is induced by the electric dipole-quadrupole interaction between the Ce3+ sensitizers and Mn2+ acceptors [19]. Furthermore, in Figure 4a, only the RT excitation peak ascribed to the Ce3+ 4f-5d transition can be observed at 260 nm, while the Mn2+ characteristic peaks cannot be witnessed because the Mn2+ absorption transitions are forbidden by spin and parity for electric dipole radiation as T > 200 K [27]. Since the RT Mn2+ luminescence is very difficult to be found in the transition-metal concentrated materials like MnF2 [27], the Ce3+-Mn2+ energy transfer offers an efficient route for obtaining Mn2+ RT luminescence in nanomaterials.

Bottom Line: Manganese materials with attractive optical properties have been proposed for applications in such areas as photonics, light-emitting diodes, and bioimaging.CeF3 and CePO4 NCs doped with Mn2+ have been prepared and can be well dispersed in aqueous solutions.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Luoshi Road, Wuhan 430072, China. yxf@whu.edu.cn.

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.

No MeSH data available.