Spectroscopic Investigation of the Europium(3+) Ion in a New ZnY4W3O16 Matrix
Spectroscopic Investigation of the Europium(3+) Ion in a New ZnY4W3O16 Matrix
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新型 ZnY4W3O16 基质中铕 (3 ) 离子的光谱研究
DOI：
10.1002/hlca.200900151
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发表时间：
2009
影响因子：
1.8
通讯作者：
J. Legendziewicz
中科院分区：
文献类型：
--
作者：
E. Tomaszewicz;M. Guzik;J. Cybińska;J. Legendziewicz
用光谱技术对一种新的锌铕钨酸盐进行了表征。该钨酸盐分子式为ZnEu4W3O16，在正交体系中结晶，并通过固相反应合成。它在1330°时不均匀融化。在250 ~ 720 nm光谱范围内，研究了ZnEu4W3O16和ZnY4W3O16: Eu3+稀释相（1、5和10 mol-% Eu3+）中Eu3+离子的激发和发射过程、发光动力学和局部环境。该体系的激发光谱（λem 615和470 nm）在265和315 nm处显示出与配体-金属电荷转移（LMCT）态相关的宽频带。在O→W （265 nm）和O→Eu3+ (315 nm) LMCT态激发下的发射光谱呈现蓝绿色发射带。钨酸盐基团的发射主要源于O2−激发的2p轨道向中心W6+离子空轨道的电荷转移态。另一方面，在Eu3+离子的发射过程中，既有O2−向Eu3+的电荷转移，也有W6+向Eu3+的能量转移。ZnY4W3O16: Eu3+稀释样品的Eu3+离子在7F0→5L6跃迁（394 nm）激发下的发射光谱显示出5D3、5D2和5D1发射态的窄发射线。讨论了活性离子（Eu3+）浓度对所研究化合物发射光谱比色特性的影响。
A new Zn and Eu tungstate was characterized by spectroscopic techniques. This tungstate, of the formula ZnEu4W3O16, crystallized in the orthorhombic system and was synthesized by a solid-state reaction. It melts incongruently at 1330°. The luminescent properties, including excitation and emission processes, luminescent dynamics, and local environments of the Eu3+ ions in ZnEu4W3O16 and ZnY4W3O16 : Eu3+ diluted phases (1, 5, and 10 mol-% of Eu3+ ion) were studied basing on the f6-intraconfigurational transitions in the 250–720 nm spectral range. The excitation spectra of this system (λem 615 and 470 nm) show broad bands with maxima at 265 and 315 nm related to the ligand-to-metal charge-transfer (LMCT) states. The emission spectra under excitation at the O→W (265 nm) and O→Eu3+ (315 nm) LMCT states present the blue-green emission bands. The emission of tungstate groups mainly originate from the charge-transfer state of excited 2p orbitals of O2− to the empty orbitals of the central W6+ ions. On the other hand, in the emission of the Eu3+ ions, both the charge transfer from O2− to Eu3+ and the energy transfer from W6+ ions to Eu3+ are involved. The emission spectra under excitation at the 7F0→5L6 transition of the Eu3+ ion (394 nm) of ZnY4W3O16 : Eu3+ diluted samples show narrow emission lines from the 5D3, 5D2, and 5D1 emitting states. The effect of the active-ion (Eu3+) concentration on the colorimetric characteristic of the emissions of the compound under investigation are presented.