Journal
CRYSTENGCOMM
Volume 17, Issue 30, Pages 5702-5709Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ce00869g
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Funding
- National Basic Research Program of China (973 Program) [2012CB922001]
- National Natural Science Foundation of China [51102224]
- Anhui Provincial Natural Science Foundation [1408085QE84]
- Fundamental Research Fund for the Central Universities [WK 2060140014]
- AFOSR
- DTRA [HDTRA12221]
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By SiO2 shell coating and Nd3+ doping, layer-structured hexagonal phase Gd2O2CO3:Yb3+, Er3+ nanoparticles were synthesized successfully through a homogeneous precipitation method. The detailed mechanism was investigated and the results indicate that the SiO2 shell and Nd3+ doping ions can effectively prevent hexagonal phase Gd2O2CO3 from decomposing into cubic phase Gd2O3 during heat treatment, because the SiO2 shell limits the diffusion of CO2 gas and the Nd3+ doping increases the decomposition temperature of Gd2O2CO3. Compared with non-layer-structured GdVO4:20%Yb3+, 2%Er3+, 4%Nd3+ particles with similar diameters and morphologies and lower phonon energies, layer-structured Gd2O2CO3:20%Yb3+, 2%Er3+, 4%Nd3+/SiO2 hexagonal phase particles show much a stronger upconversion emission, suggesting that layer-structured materials are more appropriate as upconversion hosts. Furthermore, the paramagnetic properties of Gd2O2CO3:Yb3+, Er3+, Nd3+/SiO2 nanoparticles were also demonstrated.
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