Print Email Facebook Twitter Electronic structure and site occupancy of lanthanide-doped (Sr, ca)3(Y, lu)2Ge3O12 garnets Title Electronic structure and site occupancy of lanthanide-doped (Sr, ca)3(Y, lu)2Ge3O12 garnets: A spectroscopic and first-principles study Author Luo, H. (TU Delft RST/Fundamental Aspects of Materials and Energy) Ning, Lixin (Anhui Normal University) Dong, Yuanyuan (Anhui Normal University) bos, A.J.J. (TU Delft RST/Luminescence Materials) Dorenbos, P. (TU Delft RST/Luminescence Materials) Date 2016 Abstract Photoluminescence excitation (PLE) and emission spectra (PL) of undoped (Sr, Ca)3(Y, Lu)2Ge3O12 as well as Eu3+- and Ce3+-doped samples have been investigated. The PL spectra show that Eu3+ enters into both dodecahedral (Ca, Sr) and octahedral (Y, Lu) sites. Ce3+ gives two broad excitation bands in the range of 200−450 nm. First-principle calculations for Ce3+ on both dodecahedral and octahedral sites provide sets of 5d excited level energies that are consistent with the experimental results. Then the vacuum referred binding energy diagrams for (Sr, Ca)3(Y, Lu)2Ge3O12 have been constructed with the lanthanide dopant energy levels by utilizing spectroscopic data. The Ce3+ 5d excited states are calculated by first-principles calculations. Thermoluminescence (TL) glow curves of (Ce3+, Sm3+)-codoped (Sr, Ca)3(Y, Lu)2Ge3O12 samples show a good agreement with the prediction of lanthanide trapping depths derived from the energy level diagram. Finally, the energy level diagram is used to explain the low thermal quenching temperature of Ce3+ and the absence of afterglow in (Sr, Ca)3(Y, Lu)2Ge3O12. To reference this document use: http://resolver.tudelft.nl/uuid:f28605e8-78df-4443-89f5-2102fc42f510 DOI https://doi.org/10.1021/acs.jpcc.6b09077 Embargo date 2017-11-25 ISSN 1932-7447 Source The Journal of Physical Chemistry C, 120 (50), 28743-28752 Part of collection Institutional Repository Document type journal article Rights © 2016 H. Luo, Lixin Ning, Yuanyuan Dong, A.J.J. bos, P. Dorenbos Files PDF Luo_et_al_J_Phys_Chem_C_1 ... ersion.pdf 2.18 MB Close viewer /islandora/object/uuid:f28605e8-78df-4443-89f5-2102fc42f510/datastream/OBJ/view