Bright white up-conversion emission from Yb3+/Tm3+/Ho3+ tri-doped M-AgGd(WO4)2 phosphors
Bright white up-conversion emission from Yb3+/Tm3+/Ho3+ tri-doped M-AgGd(WO4)2 phosphors
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DOI：
10.1016/j.jlumin.2013.11.037
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发表时间：
2014-08
影响因子：
3.6
通讯作者：
Ni Liu;Wei Wang;X. Wang;Diping He;H. Jiao
中科院分区：
文献类型：
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作者：
Ni Liu;Wei Wang;X. Wang;Diping He;H. Jiao
采用高温固相法制备了Yb 3 +/Tm 3 +/Ho 3+三掺杂AgGd（WO 4）2单斜发光材料。通过上转换过程产生的白色发射包括475 nm的蓝色UC辐射（对应于Tm ~（3+）离子的1G 4 → 3 H6跃迁）、542 nm的绿色辐射（对应于Ho ~（3+）离子的5 F4、5S 2 → 5I 8跃迁）和650 nm的红色辐射（包括Ho ~（3+）离子的5 F5 → 5I 8跃迁和Tm ~（3+）离子的1G 4 → 3F 4跃迁），在980 nm半导体激光器的激发下，在所制备的粉末中观察到。在分析光谱和泵浦功率依赖关系的基础上，详细讨论了调谐白色光输出的UC机制，其中蓝光发射来源于三光子过程，绿色和红光发射来源于双光子过程。在AgGd 0.737 Yb 0.200 Ho 0.013 Tm 0.05（WO 4）2的最佳化学组成下，通过调节掺杂离子Tm 3+的浓度，通过上转换（UC）工艺制备了样品，在980 nm近红外激发下，可以观察到明亮的白色发光。Mo 6+掺杂后，Yb 3 +/Tm 3 +/Ho 3+三掺杂单斜晶系AgGdW 2 O 8的结构和UC性质发生了转变，并随着Mo 6+掺杂浓度的增加，UC发光的颜色发生了调谐。当AgGd 0.737 Yb 0.200 Ho 0.013 Tm0.050（WO 0.6Mo 0.4O 4）2的最佳化学组成为0.200 Ho 0.013 Tm0.050（WO 4）2时，样品在980 nm近红外激发下可发出明亮的白色光，约为0.200 Ho 0.013 Tm0.050（WO 4）2的9.5倍。
Monoclinic Yb3+/Tm3+/Ho3+tri-doped AgGd(WO4)2phosphors were prepared by the high temperature solid-state method. White emission via up-conversion process consisting of the blue UC radiations at 475 nm corresponding to the1G4→3H6transitions of Tm3+ion, green at 542 nm to the5F4,5S2→5I8transition of Ho3+ions and red at 650 nm including both the5F5→5I8transition of the Ho3+ion and the1G4→3F4transition of Tm3+ion, was observed in the as-prepared powders under the excitation of a 980 nm diode laser. On the basis of spectral and pump power dependence analyses, the blue emission originated from the three-photon process and the green and red emissions originated from the two-photon process, the UC mechanisms for the fine-tuned white output were discussed in detail. Bright white luminescence upon 980 nm near-infrared excitation can be observed for the sample at the optimum chemical composition of AgGd0.737Yb0.200Ho0.013Tm0.05(WO4)2, which is produced via an up-conversion (UC) process by tuning the dopant ions Tm3+concentration. By doping of Mo6+, the structure and UC properties of the Yb3+/Tm3+/Ho3+tri-doped monoclinic AgGdW2O8transformed to a tetragonal one, and the color of UC emission were also tuned with the increase of Mo6+concentration. Bright white luminescence upon 980 nm near-infrared excitation can be observed for the sample at the optimum chemical composition of AgGd0.737Yb0.200Ho0.013Tm0.05(W0.6Mo0.4O4)2, which is about 9.5 times to that of the AgGd0.737Yb0.200Ho0.013Tm0.050(WO4)2.