Crystal structure and photoluminescence correlations in white emitting nanocrystalline ZrO2:Eu3+ phosphor: Effect of doping and annealing
Crystal structure and photoluminescence correlations in white emitting nanocrystalline ZrO2:Eu3+ phosphor: Effect of doping and annealing
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DOI：
10.1016/j.jlumin.2011.09.011
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发表时间：
2012-02
影响因子：
3.6
通讯作者：
S. D. Meetei;S. D. Singh;N. Singh;V. Sudarsan;R. Ningthoujam;M. Tyagi;S. Gadkari;R. Tewari;
中科院分区：
文献类型：
--
作者：
S. D. Meetei;S. D. Singh;N. Singh;V. Sudarsan;R. Ningthoujam;M. Tyagi;S. Gadkari;R. Tewari;
采用简单的沉淀法合成了白色纳米晶ZrO 2：Eu 3+荧光粉。X射线衍射（XRD）研究表明，ZrO 2和ZrO 2：Eu 3+样品中存在单斜和四方晶相。单斜相随退火温度的升高而增加，而四方相随Eu 3+浓度的增加而增加。这可能是由于Eu 3+取代Zr 4+时产生的氧空位所致。在250、286、394和470 nm的激发波长下，观察到Eu ~（3+）在591、596、606和613 nm处的光致发光发射峰。发现591和606 nm处的峰与四方晶系相有关，596和613 nm处的峰与单斜晶系相有关。发现这些峰的强度随着晶体结构的变化而变化。在特定的加热温度下，对应于591 nm峰的寿命值随Eu ~（3+）浓度的增加而增加，表明四斜相相对于单斜相的增加。掺杂样品的CIE坐标接近于白色的CIE坐标（0.33，0.33）。掺杂和退火导致的掺杂样品晶体结构的变化并不影响白色发射。
White emitting nanocrystalline ZrO2:Eu3+phosphors were synthesized by a simple precipitation route without using a capping agent. X-ray diffraction (XRD) study of ZrO2and ZrO2:Eu3+samples revealed the presence of monoclinic and tetragonal phases. The monoclinic phase increases with increase in the annealing temperature while the tetragonal phase increases with increase in the concentration of Eu3+. This can be attributed to the presence of oxygen vacancy evolved when Zr4+is replaced by Eu3+. Photoluminescence (PL) emission peaks of Eu3+are observed at 591, 596, 606 and 613nm on monitoring excitation wavelengths at 250, 286, 394 and 470nm. The peaks at 591 and 606nm were found to correlate with the tetragonal phase and those at 596 and 613nm with the monoclinic phase. Intensities of these peaks are found to change as the crystal structure changes. The lifetime value corresponding to 591nm peak increases with Eu3+concentration at a particular heating temperature indicating increase of tetragonal phase with respect to monoclinic phase. The CIE co-ordinates of the doped samples were found to be close to that of white color (0.33, 0.33). The changes in the crystal structure of the doped samples due to doping and annealing did not affect the white color emission.