期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 9, 页码 3156-3161出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm03273e
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资金
- Deutsche Forschungsgemeinschaft (DFG) through the Cluster of Excellence
We report on tunable photoluminescence from mixed-valence Eu-doped nanocrystalline Li2ZnSiO4 glass ceramics. After preparation of the precursor glass in air, gradual reduction of Eu3+ to Eu2+ occurs intrinsically during thermal annealing and precipitation of crystalline Li2ZnSiO4. Dual-mode photoemission can be generated for exciting at a wavelength of about 360 nm. The resulting colour of luminescence, ranging from orange/red to blue, can be controlled by adjusting the annealing temperature and, hence, the degree of crystallization: with increasing annealing temperature, the ratio of luminescence intensities related to Eu3+ and Eu2+ species, respectively, varies as a result of increasing degree of Eu3+-reduction as well as distinct changes in the optical scattering behaviour of the obtained glass ceramic. At the same time, the bandwidth of Eu2+-related photoemission increases from 87 to 154 nm. The underlying mechanisms of photoemission and energy transfer from Eu2+ to Eu3+ are discussed on the basis of dynamic emission spectroscopy and structural considerations, and a description of the internal reduction process is given.
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