Formation of luminescent silver-clusters and efficient energy transfer to Eu3+ in faujasite NaX zeolite
Formation of luminescent silver-clusters and efficient energy transfer to Eu3+ in faujasite NaX zeolite
复制标题
八面沸石 NaX 沸石中发光银团簇的形成以及向 Eu3 的高效能量转移
DOI：
10.1016/j.jssc.2020.121227
复制
发表时间：
2020
影响因子：
3.3
通讯作者：
Deping Wang
中科院分区：
文献类型：
--
作者：
Yanling Shi;Song Ye;Huazhen Liao;Junfang Liu;Deping Wang
八面沸石（FAU）型沸石由方钠石笼构成，六角形面之间通过氧桥连接，具有高阳离子交换容量和热稳定性的特点。本研究采用无模板水热法制备了Na/Si/Al摩尔比为4.08:1.4:1.0的FAU-NaX沸石，并通过X射线衍射分析证实，在此基础上通过离子交换过程得到了一系列Ag+或/和Eu3+负载沸石。 PL光谱测量表明，在400-600°C之间的优化温度下热处理后，负载Ag+的沸石在540-550 nm附近表现出强烈的绿色可见光发射，这是由于Ag3n+团簇的形成。此外，负载Ag+/Eu3+的沸石可以实现从银团簇到Eu3+的高效能量转移，以银团簇寿命评估的ZX-2Eu30Ag、ZX-5Eu30Ag、ZX-10Eu30Ag和ZX-10Eu30Ag的能量转移效率分别为23.9%、44.6%、67.4%和73.6%。 ZX-20Eu30Ag。此外，XPS测量表明Eu3+的负载导致银团簇的进一步减少，这也可以在不进行热处理的情况下促进银团簇的形成。这种新型金属团簇和稀土 (RE) 离子共活化荧光粉可能会在光电子和照明领域提供有趣的前景应用。
Faujasite (FAU) type zeolite is built from sodalite cages that joined by oxygen bridges between the hexagonal faces, and is characteristic of high cation exchange capacity and thermal stability. In this research, the FAU-NaX zeolite with Na/Si/Al molar ratio of 4.08:1.4:1.0 was prepared with template-free hydrothermal method and then confirmed with XRD analysis, based on which a series of Ag+or/and Eu3+loaded zeolites were obtained through the ion-exchange procedure. The PL spectra measurement indicated that after heat treatment at optimized temperatures between 400-600 °C, the Ag+loaded zeolites showed strong green visible emission centered around 540–550 nm, which is due to the formation of Ag3n+clusters. Furthermore, efficient energy transfer from silver-clusters to Eu3+can be achieved in the Ag+/Eu3+loaded zeolites, and the energy transfer efficiency that evaluated with silver-clusters lifetimes are 23.9%, 44.6%, 67.4% and 73.6%, respectively, in ZX-2Eu30Ag, ZX-5Eu30Ag, ZX-10Eu30Ag and ZX-20Eu30Ag. Besides, the XPS measurements implied that the loading of Eu3+resulted in a further reduction of silver-clusters, which can also promote the formation of silver-clusters without heat treatment. This new class of metal-clusters and rare earth (RE) ions co-actived phosphors may offer interesting perspective applications in optoelectronics and lighting.