研究目的
Investigating the synthesis of Sr2Si5N8:Eu2+ nanophosphor by a simple milling approach and its applications to white LED and silicon solar cell as a downshifting medium.
研究成果
The Sr2Si5N8:Eu2+ nanophosphor synthesized by a simple milling approach showed high quantum efficiency and unique optical properties due to Rayleigh scattering. Its applications in white LEDs and solar cells demonstrated potential for improving color rendering and solar cell efficiency, despite some limitations in luminous efficiency and efficiency gain.
研究不足
The nanophosphor showed lower luminous efficiency in white LED applications and the efficiency gain in solar cells was relatively small. The process may produce non-spherical nanophosphors with poor crystallinity and surface defects.
1：Experimental Design and Method Selection:
The synthesis of Sr2Si5N8:Eu2+ nanophosphor was achieved through a high-energy planetary milling method. The bulk phosphor was prepared by a solid-state reaction and then milled to nanoscale.
2：Sample Selection and Data Sources:
The bulk phosphor was synthesized from SrH2, Si3N4, and Eu2O
3：The nanophosphor was obtained by milling the bulk phosphor with ZrO2 beads. List of Experimental Equipment and Materials:
Planetary miller (FRITSCH, Planetary Mono Mill), ZrO2 beads, polyvinyl alcohol (PVA), nitric acid.
4：Experimental Procedures and Operational Workflow:
The bulk phosphor was milled with ZrO2 beads and water, followed by acid washing and filtering to obtain the nanophosphor. The nanophosphor was then dispersed in PVA to form films for application in LEDs and solar cells.
5：Data Analysis Methods:
The properties of the nanophosphor and its applications were analyzed through XRD, SEM, PSA, PL, PLE spectra, and efficiency measurements of LEDs and solar cells.
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