4.7 Article

Highly efficient cyan-emitting garnet Ca3Hf2SiAl2O12: xCe3+ phosphor for solid state white lighting

Journal

CRYSTENGCOMM
Volume 17, Issue 17, Pages 3235-3242

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ce00020c

Keywords

-

Funding

  1. Specialized Research Fund for the Doctoral Program of Higher Education [20120211130003]
  2. National Natural Science Funds of China [51372105]
  3. Fundamental Research Funds for the Central Universities [lzujbky-2014-231]

Ask authors/readers for more resources

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.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available