Li Minhong, Wang Lili, Ran Weiguang, Deng Zhihan, Shi Jinsheng, Ren Chunyan
Department of Chemistry and Pharmaceutical Science, Qindao Agricultural University, Qingdao 266109, China.
Materials (Basel). 2017 Feb 24;10(3):227. doi: 10.3390/ma10030227.
A series of Tb3+, Eu3+-doped Sr2MgSi2O7 (SMSO) phosphors were synthesized by high temperature solid-state reaction. X-ray diffraction (XRD) patterns, Rietveld refinement, photoluminescence spectra (PL), and luminescence decay curves were utilized to characterize each sample's properties. Intense green emission due to Tb3+ 5D4→7F5 transition was observed in the Tb3+ single-doped SMSO sample, and the corresponding concentration quenching mechanism was demonstrated to be a diople-diople interaction. A wide overlap between Tb3+ emission and Eu3+ excitationspectraresults in energy transfer from Tb3+ to Eu3+. This has been demonstrated by the emission spectra and decay curves of Tb3+ in SMSO:Tb3+, Eu3+ phosphors. Energy transfer mechanism was determined to be a quadrupole-quadrupole interaction. And critical distance of energy transfer from Tb3+ to Eu3+ ions is calculated to be 6.7 Å on the basis of concentration quenching method. Moreover, white light emission was generated via adjusting concentration ratio of Tb3+ and Eu3+ in SMSO:Tb3+, Eu3+ phosphors. All the results indicate that SMSO:Tb3+, Eu3+ is a promising single-component white light emitting phosphor.
通过高温固相反应合成了一系列Tb3+、Eu3+共掺杂的Sr2MgSi2O7（SMSO）荧光粉。利用X射线衍射（XRD）图谱、Rietveld精修、光致发光光谱（PL）和发光衰减曲线对每个样品的性能进行了表征。在Tb3+单掺杂的SMSO样品中观察到了由于Tb3+的5D4→7F5跃迁产生的强烈绿色发射，并且证明相应的浓度猝灭机制是偶极-偶极相互作用。Tb3+发射光谱与Eu3+激发光谱的广泛重叠导致了从Tb3+到Eu3+的能量转移。这已通过SMSO:Tb3+，Eu3+荧光粉中Tb3+的发射光谱和衰减曲线得到证明。确定能量转移机制为四极-四极相互作用。基于浓度猝灭法计算出从Tb3+到Eu3+离子的能量转移临界距离为6.7 Å。此外，通过调节SMSO:Tb3+，Eu3+荧光粉中Tb3+和Eu3+的浓度比产生了白光发射。所有结果表明SMSO:Tb3+，Eu3+是一种有前途的单组分白光发射荧光粉。
