Print Email Facebook Twitter Luminescent properties and energy level structure of CaZnOS:Eu2+ Title Luminescent properties and energy level structure of CaZnOS:Eu2+ Author Budde, B (Student TU Delft) Luo, H. (TU Delft RST/Fundamental Aspects of Materials and Energy) Dorenbos, P. (TU Delft RST/Fundamental Aspects of Materials and Energy) van der Kolk, E. (TU Delft RST/Fundamental Aspects of Materials and Energy) Date 2017 Abstract In this work it is shown that CaZnOS:Eu2+ has no Eu2+ emission even at low temperature. The observed and earlier reported red emission originates from a CaS:Eu2+ impurity phase. By means of washing the as-prepared samples with diluted nitride acid, we were able to remove the CaS impurity phase and study the Eu2+ emission in the pure CaZnOS phase. A clear relation was found between the red emission intensity, the CaS XRD line intensities and the nitric acid solution washing time, with zero intensity after prolonged washing. A so-called VRBE (vacuum referred binding energy)-diagram was constructed showing the energy of the 4fn and 4fn-15d1 states of the divalent and trivalent rare earth ions as dopants in CaZnOS with respect to the vacuum energy. This diagram shows that the 5d-levels of Eu2+ are located in the conduction band, which explains the absence of 5d→4f emission. By comparing the VRBE diagram with diagrams of other related compounds like CaO, CaS, ZnO and ZnS it becomes clear that the Eu2+ luminescence quenching is caused by a low lying conduction band, typical for Zn-based compounds. Subject CaZnOSEnergy levelEu To reference this document use: http://resolver.tudelft.nl/uuid:cde5be5d-9bdd-476d-8cc8-8c8d4ffe8429 DOI https://doi.org/10.1016/j.optmat.2017.04.045 Embargo date 2019-05-08 ISSN 0925-3467 Source Optical Materials, 69, 378-381 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2017 B Budde, H. Luo, P. Dorenbos, E. van der Kolk Files PDF Manuscript_Revised.pdf 529.48 KB Close viewer /islandora/object/uuid:cde5be5d-9bdd-476d-8cc8-8c8d4ffe8429/datastream/OBJ/view