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Title: | Can europium atoms form luminescent centres in diamond: A combined theoretical-experimental study | Authors: | VANPOUCKE, Danny E.P. NICLEY, Shannon RAYMAKERS, Jorne MAES, Wouter HAENEN, Ken |
Issue Date: | 2019 | Publisher: | ELSEVIER SCIENCE SA | Source: | DIAMOND AND RELATED MATERIALS, 94, p. 233-241 | Abstract: | The incorporation of Eu into the diamond lattice is investigated in a combined theoretical experimental study. The large size of the Eu ion induces a strain on the host lattice, which is minimal for the Eu-vacancy complex. The oxidation state of Eu is calculated to be 3+ for all defect models considered. In contrast, the total charge of the defect-complexes is shown to be negative: -1.5 to -2.3 electron. Hybrid-functional electronic-band structures show the luminescence of the Eu defect to be strongly dependent on the local defect geometry. The 4-coordinated Eu substitutional dopant is the most promising candidate to present the typical Eu3+ luminescence, while the 6-coordinated Eu-vacancy complex is expected not to present any luminescent behaviour. Preliminary experimental results on the treatment of diamond films with Eu-containing precursor indicate the possible incorporation of Eu into diamond films treated by drop-casting. Changes in the PL spectrum, with the main luminescent peak shifting from approximately 614 nm to 611 nm after the growth plasma exposure, and the appearance of a shoulder peak at 625 nm indicate the potential incorporation. Drop-casting treatment with an electronegative polymer material was shown not to be necessary to observe the Eu signature following the plasma exposure, and increased the background luminescence. | Notes: | [Vanpoucke, Danny E. P.; Nicley, Shannon S.; Raymakers, Jorne; Maes, Wouter; Haenen, Ken] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Vanpoucke, Danny E. P.; Nicley, Shannon S.; Raymakers, Jorne; Maes, Wouter; Haenen, Ken] IMEC VZW, IMOMEC, B-3590 Diepenbeek, Belgium. [Nicley, Shannon S.] Univ Oxford, Dept Mat, Oxford, England. | Keywords: | Diamond; Eu; Doping; Defects; DFT; Density functional theory; Electronic structure; Phonons; Photoluminescence;Diamond; Eu; Doping; Defects; DFT; Density functional theory; Electronic structure; Phonons; Photoluminescence | Document URI: | http://hdl.handle.net/1942/29652 | ISSN: | 0925-9635 | e-ISSN: | 1879-0062 | DOI: | 10.1016/j.diamond.2019.02.024 | ISI #: | 000467511300030 | Rights: | 2019 Elsevier B.V. All rights reserved.T | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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