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Title: | Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles | Authors: | Devesa, Susana Rodrigues, Joana Teixeira, Sílvia Soreto Rooney, Aidan P Graça, Manuel P F Cooper, David Monteiro, Teresa Costa, Luís C |
Keywords: | erbium niobate; sol–gel; PL; PLE; TRPL | Issue Date: | 8-Mar-2021 | Publisher: | MDPI | Project: | UID/CTM/50025/2019 UID/FIS/04564/2020 POCI-01-0145-FEDER-028755 Horizon 2020 ASCENT EU project (Access to European Nanoelectronics Network—Project n.º 654384 |
Serial title, monograph or event: | Nanomaterials | Volume: | 11 | Issue: | 3 | Abstract: | Tetragonal Er0.5Nb0.5O2 and monoclinic ErNbO4 micro- and nanoparticles were prepared by the citrate sol-gel method and heat-treated at temperatures between 700 and 1600 °C. ErNbO4 revealed a spherical-shaped crystallite, whose size increased with heat treatment temperatures. To assess their optical properties at room temperature (RT), a thorough spectroscopic study was conducted. RT photoluminescence (PL) spectroscopy revealed that Er3+ optical activation was achieved in all samples. The photoluminescence spectra show the green/yellow 2H11/2, 4S3/2→4I15/2 and red 4F9/2→4I15/2 intraionic transitions as the main visible recombination, with the number of the crystal field splitting Er3+ multiplets reflecting the ion site symmetry in the crystalline phases. PL excitation allows the identification of Er3+ high-energy excited multiplets as the preferential population paths of the emitting levels. Independently of the crystalline structure, the intensity ratio between the green/yellow and red intraionic transitions was found to be strongly sensitive to the excitation energy. After pumping the samples with a resonant excitation into the 4G11/2 excited multiplet, a green/yellow transition stronger than the red one was observed, whereas the reverse occurred for higher excitation photon energies. Thus, a controllable selective excited tunable green to red color was achieved, which endows new opportunities for photonic and optoelectronic applications. | URI: | https://hdl.handle.net/10316/105288 | ISSN: | 2079-4991 | DOI: | 10.3390/nano11030660 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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