| KMgF3∶Ce3+，Eu2+的溶剂热合成与光谱性质 |
| Solvothermal Synthesis and Fluorescence of KMgF3∶Ce3+，Eu2+ |
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| 摘要: 采用溶剂热法合成了Eu2+，Ce3+单掺和双掺KMgF3。分析了样品的结构与形貌。结果表明，所合成的样品均为单相，颗粒粒度分布集中。测定了它们的激发和发射光谱，结果显示：在单掺Eu2+的KMgF3中，没有观察到位于420 nm附近由微量氧色心引起的宽带发射，只发现峰值位于360 nm附近的锐峰线发射，说明溶剂热合成的KMgF3∶Eu中氧含量极低;在KMgF3双掺体系中由于Eu2+和Ce3+竞争吸收激发能，Eu2+把能量传递给Ce3+，存在Eu2+→Ce3+能量传递过程,观察到Ce3+的较强的发射带和Eu2+的较弱的线发射，并讨论了能量传递机理。 |
| 关键词: 溶剂热 稀土离子 KMgF3 光谱 能量传递 |
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| Abstract: Phosphors of KMgF3 single-doped and co-doped with Ce3+ and/or Eu2+ were synthesized respectively through solvothermal method at 180 ℃ and characterized by means of X-ray powder diffraction(XRD) and environment scanning electron microscopy(ESEM). The excitation and emission spectra of the rare earth ions doped KMgF3 through solvothermal process was also studied. In the KMgF3∶Eu2+ sample, there was only one sharp line emission located at 360 nm arising from f-f(6P7/2→8S7/2) transition of Eu2+ in the host lattice and the broad bands appearing at 420 nm arising from Eu2+←O could not be observed. The results showed that the oxygen content was low. In the system of KMgF3 co-doped with Ce3+ and Eu2+, the strong emission band of the Ce3+ could be observed due to the competitive absorption of the exciting energy between the Eu2+ and Ce3+, while the emission peak of the Eu2+ could only be observed due to energy transfer from Ce3+ to Eu2+ appearing in the KMgF3∶Eu2+，Ce3+ polycrystalline powder prepared by solid state reaction at a high temperature. In addition, the mechanism of energy transfer was discussed. |
| Keywords: solvothermal synthesis rare earth ion KMgF3 photoluminescence energy transfer |
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| 朱国贤,连洪州,李永大,王兴权,石春山.KMgF3∶Ce3+，Eu2+的溶剂热合成与光谱性质[J].无机化学学报,2008,24(11):1822-1826. |
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