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Preparation and characterization of YAG microspheres doped with Eu2+/Eu3+for broad band emission

Authors :
Ghadamyari, Marzieh
Klement, Róbert
Ebrahim Hosseini, Hossein
Parchovianský, Milan
Kraxner, Jozef
Galusek, Dušan
Narayanasamy, Sathya
Hack, Erwin
Blugan, Gurdial
Michálková, Monika
Source :
Open Ceramics; 20240101, Issue: Preprints
Publication Year :
2024

Abstract

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→ 4f7electron transition within the Eu2+ions.

Details

Language :
English
ISSN :
26665395
Issue :
Preprints
Database :
Supplemental Index
Journal :
Open Ceramics
Publication Type :
Periodical
Accession number :
ejs67098175
Full Text :
https://doi.org/10.1016/j.oceram.2024.100654