Journal
CRYSTENGCOMM
Volume 17, Issue 17, Pages 3235-3242Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ce00020c
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Funding
- Specialized Research Fund for the Doctoral Program of Higher Education [20120211130003]
- National Natural Science Funds of China [51372105]
- Fundamental Research Funds for the Central Universities [lzujbky-2014-231]
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In this paper, we have synthesized a new garnet structure compound Ca3Hf2SiAl2O12 and a series of Ce3+-doped Ca3Hf2SiAl2O12: xCe(3+) phosphors. The crystal structure and luminescence properties of the Ca3Hf2SiAl2O12: xCe(3+) are investigated in detail. Transmission electron microscopy analysis and XRD Rietveld refinement shows that Ca3Hf2SiAl2O12 is body-centered cubic and belongs to Ia3d (230) space-group with a = 12.3666 angstrom. Ca3Hf2SiAl2O12: xCe(3+) has broad excitation bands at 330 and 400 nm attributed to the characteristic Ce3+ 5d-4f transition and can produce cyan emission under 400 nm UV light excitation. The emission intensity of CHSA: 1%Ce3+ phosphor can reach 68.9% of YAG: Ce3+ (commercial) and 72.1% of Ca8Mg(SiO4)(4)Cl-2: Eu2+ (commercial). The average decay lifetime of Ca3Hf2SiAl2O12: 1%Ce3+ is 48.91 ns, which is consistent with the nanosecond peculiarity of Ce3+. In the process of increasing the temperature from 25 degrees C to 250 degrees C, the integrated emission intensity of Ca3Hf2SiAl2O12: 0.5%Ce3+ only decreases to 57.8% (250 degrees C) and shows nice thermal stability compared with commercial YAG: Ce3+(P46-Y3). Furthermore, Ca3Hf2SiAl2O12: 0.5%Ce3+ exhibits outstanding quantum efficiency (74.7%). It reveals that Ca3Hf2SiAl2O12: xCe(3+) possesses remarkable optical properties and can be utilized in UV-LEDs.
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