Shahi Praveen Kumar, Singh Priyam, Rai Shyam Bahadur, Bahadur Amresh
Department of Physics, Banaras Hindu University , Varanasi-221005, India.
Inorg Chem. 2016 Feb 15;55(4):1535-41. doi: 10.1021/acs.inorgchem.5b02370. Epub 2016 Jan 27.
Host-sensitized near-infrared quantum cutting (QC) emission has been demonstrated in Nd(3+) doped Gd(1-x)Nd(x)NbO4 phosphors for various x values. Further, the effect of Bi(3+) ion addition as a sensitizer on near-infrared QC is studied in detail. X-ray diffraction confirms a monoclinic structure for pure and Nd(3+) doped phosphors. Pulsed laser excitation at 266 nm of Gd(1-x)Nd(x)NbO4 and Gd(0.99-x)Nd(x)Bi(0.01)NbO4 causes efficient room-temperature energy transfer from the NbO4(3-) to the Nd(3+) ions and the NbO4(3-) and Bi(3+) ions to the Nd(3+) ions, respectively, which emits more than one near-infrared photon for single impinging ultraviolet photon. The emission band of Nd(3+) shows unusual character where the intensity of the (4)F(3/2)-(4)I(9/2) transition at 888 nm is higher than the intensity of the transition (4)F(3/2)-(4)I(11/2) at 1064 nm, due to energy transfer from GdNbO4 host to Nd(3+) ion. Using photoluminescence lifetime studies, the quantum cutting efficiencies are found to be the maximum 166% and 172% for Gd(0.95)Nd(0.05)NbO4 and Gd(0.94)Nd(0.05)Bi(0.01)NbO4, respectively. The present study could establish Nd(3+) ion as an alternative of Yb(3+) ion for near-infrared quantum cutting. This work facilitates the probing of Nd(3+) ions doped phosphor materials for next generation Si-solar cells.
已在不同x值的Nd(3+)掺杂Gd(1-x)Nd(x)NbO4荧光粉中证明了宿主敏化的近红外量子切割（QC）发射。此外，还详细研究了作为敏化剂添加Bi(3+)离子对近红外QC的影响。X射线衍射证实了纯的和Nd(3+)掺杂荧光粉的单斜结构。在266 nm处对Gd(1-x)Nd(x)NbO4和Gd(0.99-x)Nd(x)Bi(0.01)NbO4进行脉冲激光激发，分别导致从NbO4(3-)到Nd(3+)离子以及从NbO4(3-)和Bi(3+)离子到Nd(3+)离子的高效室温能量转移，对于单个入射紫外光子，会发射出多个近红外光子。Nd(3+)的发射带表现出不寻常的特征，由于从GdNbO4主体到Nd(3+)离子的能量转移，888 nm处的(4)F(3/2)-(4)I(9/2)跃迁强度高于1064 nm处的(4)F(3/2)-(4)I(11/2)跃迁强度。通过光致发光寿命研究发现，Gd(0.95)Nd(0.05)NbO4和Gd(0.94)Nd(0.05)Bi(0.01)NbO4的量子切割效率分别最高为166%和172%。本研究可以将Nd(3+)离子确立为用于近红外量子切割的Yb(3+)离子的替代物。这项工作有助于探索用于下一代硅太阳能电池的Nd(3+)离子掺杂荧光粉材料。
