Preparation and characterization of YAG microspheres doped with Eu2+/Eu3+ for broad band emission
Year: 2024
Type: article
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→ 4f7 electron transition within the Eu2+ ions.
Source: Open Ceramics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,000
Funders: University of Nevada, Las Vegas, Slovak Academic Information Agency, JECS Trust, European Commission, Ministry of Education, Culture, Sports, Science and Technology, Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, Board of the Swiss Federal Institutes of Technology, Horizon 2020 Framework Programme, Horizon 2020
Awards: G3944014833, Luminofory s nulovým teplotným zhášaním luminiscencie pre aplikácie v pc-WLED s NUV excitáciou, G5705572318, G6034373293, Vývoj pokročilých luminiscenčných sklenených 3D štruktúr pomocou aditívnej výroby, G7976579140, G8374067560, Centre for functional and surface-functionalized glasses
OpenAlex ID: W4401438439