Phase separation strategy to facilely form fluorescent [Ag2]2+/[Agm]n+ quantum clusters in boro-alumino-silicate multiphase glasses.
Phase separation strategy to facilely form fluorescent [Ag2]2+/[Agm]n+ quantum clusters in boro-alumino-silicate multiphase glasses.
复制标题
DOI：
10.1039/c8cp04536d
复制
发表时间：
2018-09
期刊：
影响因子：
--
通讯作者：
Xiaotong Chen;Junjie Zhao;Xiu-lin Xu;Kai Ren;Xue Luo;Xinwen Sun;X. Qiao;X. Fan;G. Qian
中科院分区：
文献类型：
--
作者：
Xiaotong Chen;Junjie Zhao;Xiu-lin Xu;Kai Ren;Xue Luo;Xinwen Sun;X. Qiao;X. Fan;G. Qian
通过调节ZnF 2-SrF 2/ZnO-SrO的含量，设计并采用熔体淬冷法制备了SiO2-Al 2 O3-B2 O3-Na 2 O-ZnO/ZnF 2-SrO/SrF 2-Ag系列复相玻璃。在相分离策略下，可以产生带负电荷的四面体（[BO 4]-、[ZnO 4]2-和[Al O 4]-）以稳定富含B2 O 3和富含ZnO-Al 2 O 3的子相中的不同银物质（Ag+离子; [Ag 2]2+对; [Agm]n+量子簇（[Agm]n+ QC））。富含B2 O3的亚相对Ag+离子和[Agm]n+ QC具有高溶解度。富氟相对富B2 O3亚相中的Na+有较好的萃取能力，并显著影响Ag+在富B2 O3亚相中的溶解度，最终决定了Ag+离子和Ag 0原子向[Agm]n+ QCs的聚集。富ZnO-Al 2 O3或富ZnO-SiO2（即在GZnOSrO中富SiO2）相对[Ag 2]2+对具有相对高的溶解度。通过光谱分析确定了Ag+/[Ag 2]2+/[Agm]n+ QC荧光中心，其中荧光带分别位于紫外、绿白色和橙子光谱区。[Agm]n+ QCs的荧光量子产率（QY）可提高到55.7%，这三个发光中心的结合可实现白色发光。
By adjusting the content of ZnF2-SrF2/ZnO-SrO, a series of SiO2-Al2O3-B2O3-Na2O-ZnO/ZnF2-SrO/SrF2-Ag multiphase glasses was designed and prepared via a melt-quenching method. Under a phase separation strategy, negatively charged tetrahedrons ([BO4]-, [ZnO4]2-, and [AlO4]-) can be generated to stabilize different silver species (Ag+ ions; [Ag2]2+ pairs; [Agm]n+ quantum clusters ([Agm]n+ QCs)) in B2O3-rich and ZnO-Al2O3 rich sub-phases. The B2O3-rich sub-phase has a high solubility for Ag+ ions and [Agm]n+ QCs. The fluoride-rich phase shows a good ability to extract Na+ from the B2O3-rich sub-phase, significantly affects the solubility of Ag+ in the B2O3-rich sub-phase, and eventually determines the aggregation from Ag+ ions and Ag0 atom to [Agm]n+ QCs. The ZnO-Al2O3-rich or ZnO-SiO2-rich (i.e. SiO2-rich in GZnOSrO) phase has a relatively high solubility for [Ag2]2+ pairs. The Ag+/[Ag2]2+/[Agm]n+ QC fluorescent centers were identified by spectroscopic analysis, where the fluorescence bands are located in the ultraviolet, green-white and orange spectral regions, respectively. The fluorescent quantum yield (QY) of the [Agm]n+ QCs can be improved to 55.7%, and the combination of these three luminescent centers can achieve white light emission.