Preparation and characterization of YAG microspheres doped with Eu2+/Eu3+ for broad band emission
Achieving full-spectrum lighting is a major challenge for phosphor-converted light-emitting diodes (pc-LEDs), which are crucial for solid-state lighting. This study presents the synthesis of polycrystalline Eu-doped Y3Al5O12 (YAG) phosphors through a sol-gel method and flame synthesis process, leading to XRD amorphous microspheres. The amorphous nature of the microspheres allows the reduction of Eu3+ to Eu2+ at a significantly lower temperature (800 °C) than the reduction of crystalline samples described in the literature (1400 °C). The presence of Eu2+ in the YAG lattice was confirmed by X-ray photoelectron spectroscopy (XPS). The X-ray diffraction (XRD) of samples annealed in reducing atmosphere confirmed partial crystallization of pure YAG in all examined samples. The Eu-doped YAG phosphor embedded in residual glass microspheres exhibited a broadband emission spectrum over the wavelength range 450–800 nm peaking at 565 nm, corresponding to the 4f65d1→ 4f7 electron transition within the Eu2+ ions.
Authors
- Dušan Galusek (ORCID: https://orcid.org/0000-0001-5995-8780)
- Sathya Narayanasamy (ORCID: https://orcid.org/0000-0002-2186-1737)
- Erwin Hack (ORCID: https://orcid.org/0000-0003-1547-9889)
- Róbert Klement (ORCID: https://orcid.org/0000-0001-5935-8312)
- Marzieh Ghadamyari
- Milan Parchovianský
- Jozef Kraxner (ORCID: https://orcid.org/0000-0002-2159-4819)
- Gurdial Blugan (ORCID: https://orcid.org/0000-0002-2088-7767)
- Monika Michálková (ORCID: https://orcid.org/0000-0001-8925-4127)
- Hossein Ebrahim Hosseini (ORCID: https://orcid.org/0000-0002-2984-347X)
Institutions
- Université de Montpellier (FR)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- CEA Marcoule (FR)
- Swiss Federal Laboratories for Materials Science and Technology (CH)
Publication Details
- Journal
- Open Ceramics
- Published
- 2024-08-08
- DOI
- https://doi.org/10.1016/j.oceram.2024.100654
- Citations
- 1
- Primary Topic
- Luminescence Properties of Advanced Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.12
Funders
- University of Nevada, Las Vegas
- Slovak Academic Information Agency
- JECS Trust
- Ministry of Education, Culture, Sports, Science and Technology
- Board of the Swiss Federal Institutes of Technology
- Horizon 2020 Framework Programme
- Horizon 2020