Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications
Abstract
:1. Introduction
2. Materials and Methods
2.1. Synthesis of Core–Shell SiO2@YAG:Ce Nanoparticles
2.2. Characterization of Core–Shell Nanoparticles
3. Results and Discussion
3.1. Analyses of Synthesized Phosphor Particles
3.2. SAXS Analyses
3.3. HRTEM/TEM Observations
3.4. FTIR Analyses
3.5. Photoluminescence (PL) and Diffuse Transmission Spectra (DTS) Analyses
4. Conclusions
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- Results showed that the final phase composition of synthesized powders largely depended on pH values. The optimum condition was achieved when pH was strictly controlled at pH = 3. Any deviation from pH = 3 towards higher values, and more specifically towards the 3.5–4.0 pH range resulted in the appearance of YAM (Y4Al2O9) and YAP (YAlO3) transitional phases in as-synthesized powders. Both phases are known to have adverse attribution to the optical characteristics of YAG:Ce powders.
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- SAXS analysis showed that the mean thickness of YAG:Ce shell after one and two coating cycles were 2.8 nm and 7.7 nm. This was in agreement in HRTEM observations.
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- Heating the sample up to 10 h hardly resulted in any change in the morphology of nanoparticles, inferring that SiO2 cores were still encapsulated by YAG:Ce shell, obviously showing perfect thermal stability of SiO2@YAG:Ce core–shell nanoparticles.
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- SiO2@YAG:Ce (1.0 at.% Ce) core–shell nanoparticles show the highest emission, compared to commercial and synthesized SiO2/YAG:Ce mixture composite.
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- The number of coating cycles played a vital role in enhancing the PL intensity of the core–shell particles. The increase in the PL intensity with double coating cycle was obviously attributable to the increase of the shell thickness (YAG:Ce) on the SiO2 cores, which in turn increased emitting ions (Ce3+) per core–shell particle.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Kiani Khouzani, M.; Bahrami, A.; Yazdan Mehr, M.; van Driel, W.D.; Zhang, G. Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications. Nanomaterials 2020, 10, 153. https://doi.org/10.3390/nano10010153
Kiani Khouzani M, Bahrami A, Yazdan Mehr M, van Driel WD, Zhang G. Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications. Nanomaterials. 2020; 10(1):153. https://doi.org/10.3390/nano10010153
Chicago/Turabian StyleKiani Khouzani, Mahdi, Abbas Bahrami, Maryam Yazdan Mehr, Willem Dirk van Driel, and Guoqi Zhang. 2020. "Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications" Nanomaterials 10, no. 1: 153. https://doi.org/10.3390/nano10010153
APA StyleKiani Khouzani, M., Bahrami, A., Yazdan Mehr, M., van Driel, W. D., & Zhang, G. (2020). Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications. Nanomaterials, 10(1), 153. https://doi.org/10.3390/nano10010153