Synchrotron radiation investigations of the Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials

稀土学报(英文版), 2009, 27(4): 529-538. doi: 10.1016/S1002-0721(08)60283-5

^1, , ^2, , ^3, , ^4, , ^5, , ^6, , ^7, , ^8,

1.Department of Chemistry,University of Turku,FI-20014 Turku,Finland

2.Department of Chemistry,University of Turku,FI-20014 Turku,Finland

3.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Turku University Centre for Materials and Surfaces (MatSurf),Turku,Finland

4.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Graduate School of Materials Research (GSMR),Turku,Finland

5.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Turku University Centre for Materials and Surfaces (MatSurf),Turku,Finland

6.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Graduate School of Materials Research (GSMR),Turku,Finland

7.Department of Chemistry,University of Turku,FI-20014 Turku,Finland

8.Institute of Physics,Academy of Sciences of the Czech Republic,CZ-16253 Prague 6,Czech Republic

基金项目: the European Community-Research Infrastructure Action under the FP6 Structuring the European Re-search Area Programme(RII3-CT-2004-506008 (IA-SFS)) the Turku University Foundation,Jenny and Antli Wihuri Foundation(Finland) and the Academy of Finland(117057/2006) The help of Dr.Gregory Stryganyuk (HASYLAB) as well as Dr.Stefan Carlson and Dr.Katarina Noren (MAX-lab) during the synchrotron measurements is gratefully ac-knowledged the Integrated Infrastructure Initiative Mobility Agreements(112816/2006/JH ,116142/2006/JH,123976/2007/TL) The DFT calculations were carried out using the supercomputing resources of the CSC IT Center for Science (Espoo,Finland)

Synchrotron radiation investigations of the Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials

Tuomas Aitasalo ^1, , Jukka Hassinen ^2, , Jorma Hd(o)ls(a) ^3, , Taneli Laamanen ^4, , Mika Lastusaari ^5, , Maria Malkam(a)ki ^6, , Janne Niittykoski ^7, , Pavel Novák ^8,

1.Department of Chemistry,University of Turku,FI-20014 Turku,Finland

2.Department of Chemistry,University of Turku,FI-20014 Turku,Finland

3.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Turku University Centre for Materials and Surfaces (MatSurf),Turku,Finland

4.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Graduate School of Materials Research (GSMR),Turku,Finland

5.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Turku University Centre for Materials and Surfaces (MatSurf),Turku,Finland

6.Department of Chemistry,University of Turku,FI-20014 Turku,Finland;Graduate School of Materials Research (GSMR),Turku,Finland

7.Department of Chemistry,University of Turku,FI-20014 Turku,Finland

8.Institute of Physics,Academy of Sciences of the Czech Republic,CZ-16253 Prague 6,Czech Republic

Keywords： strontium magnesium disilieate

The electronic and defect energy level structure of polycrystalline Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials were studied with thermoluminescence and different synchrotron radiation spectroscopies (UV-VUV emission and excitation,X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption fine structure (EXAFS)).Special attention was paid on the effect of the R3+ co-dopants on the persistent luminescence properties of the materials.Theoretical calculations using the density functional theory (DFT) were carried out simultaneously with the experimental work.The experimental band gap energy (Eg) value of ca.7.1 eV agreed very well with the DFT value of 6.7 eV.The variation of the Eg value was attempted to relate with the trap structure as well as with the different properties of the R3+ co-dopants.The trap level energy distribution depended strongly on the R3+ co-dopant except for the shallowest trap energy above the room temperature remaining practically the same,however.The different processes in the mechanism of persistent luminescence from Sr2MgSi2O7:Eu2+,R3+ were assembled and their contributions discussed.

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