Intriguing luminescence properties of (Ba, Sr)3Si6O9N4: Eu2+ phosphors via modifying synthesis method and cation substitution
Intriguing luminescence properties of (Ba, Sr)3Si6O9N4: Eu2+ phosphors via modifying synthesis method and cation substitution
复制标题
DOI：
10.1016/j.jallcom.2016.05.009
复制
发表时间：
2016-10-15
影响因子：
6.2
通讯作者：
Hintzen, Hubertus T. (Bert)
中科院分区：
文献类型：
--
作者：
Yin, Liang-Jun;Ji, Wei-Wei;Hintzen, Hubertus T. (Bert)
由于Ba 3Si 6 O 12 N2与Ba 3Si 6 O 12 N2具有相似的晶体结构，因此通过常规的固相反应法合成纯相Ba 3Si 6 O 9 N4具有挑战性。本文提出了一种低温合成方法，并采用机械化学活化法制备了一系列绿色转蓝色（Ba，Sr）（3）Si_6O_9N_4：Eu ~（2+）荧光粉。研究了由磷光体组成的变化引起的光致发光特性和晶体结构的变化。在紫外光激发下，Ba 3Si 6 O 9 N4：Eu 2+荧光粉在518 nm处有一个很强的窄绿色发射，同时在405 nm处有一个很弱的发射，密度泛函理论（DFT）计算证明这是由于Ba 3Si 6 O 9 N4晶格中Eu/Ba位置不同所致。通过Sr/Ba置换，调节（Ba，Sr）（3）Si 6 O 9 N4：Eu 2+的晶体结构和Eu 2+的局域配位环境，可以实现（Ba，Sr）（3）Si 6 O 9 N4：Eu 2+的连续绿色到蓝色发光。更多的Sr/Ba取代改善了热猝灭，并导致不同的特征发射峰位移时，增加温度。(C)2016爱思唯尔B. V.保留所有权利。
Synthesizing pure phase Ba3Si6O9N4 by the conventional solid-state reaction method is challenging because of easily formed secondary phase Ba3Si6O12N2 showing similar crystal structure. In this work, an alternative low temperature synthesis method is presented, and a series of green to blue emitting (Ba, Sr)(3)Si6O9N4: Eu2+ phosphors were prepared by a mechanochemical activation route. Variations in photoluminescence properties and crystal structure, as induced by the change in phosphor composition, were investigated. Under ultraviolet-light excitation, Ba3Si6O9N4: Eu2+ phosphor exhibited a strong narrow green emission at 518 nm and simultaneously a weak emission at 405 nm, which are ascribed to different Eu/Ba sites in Ba3Si6O9N4 lattice proved by Density Functional Theory (DFT) calculations. A continuous green to blue emission in (Ba, Sr)(3)Si6O9N4: Eu2+ phosphors could be achieved by tuning the crystal structure and local coordination environment acting on Eu2+ with Sr/Ba substitution. More Sr/Ba substitution improved thermal quenching and resulted in a different characteristic of emission peak shift upon increasing the temperature. (C) 2016 Elsevier B.V. All rights reserved.