论文标题
了解德国锌的紫外线发光：天然缺陷的作用
Understanding the UV luminescence of zinc germanate: The role of native defects
论文作者
论文摘要
在光电设备中，实现高效且稳定的紫外线排放是一个具有挑战性的目标。本文中，我们通过光致发光测量值与温度和激发条件的函数一起研究了锌德国Zn2Geo4微管的UV发光。发射的紫外线由与天然缺陷结构相关的两个带（一个宽的带和一个狭窄的频带）组成。另外，借助密度功能理论（DFT）计算，已经计算出与Zn2Geo4中与天然缺陷相关的电子水平的能量位置。特别是，我们的结果支持锌间隙是负责狭窄的紫外线的负责，这反过来又分成了两个具有不同温度依赖性行为的成分。这两个组件的起源是根据Zn_i在晶格中的特定位置进行解释的，并同意DFT计算。此外，提出了动力学发光模型来确定该紫外线发射的温度演化。这些结果为利用缺陷工程铺平了道路，以实现功能性光电设备以在紫外线区域运行。
Achieving efficient and stable ultraviolet emission is a challenging goal in optoelectronic devices. Herein, we investigate the UV luminescence of zinc germanate Zn2GeO4 microwires by means of photoluminescence measurements as a function of temperature and excitation conditions. The emitted UV light is composed of two bands (a broad one and a narrow one) associated with the native defects structure. In addition, with the aid of density functional theory (DFT) calculations, the energy positions of the electronic levels related to native defects in Zn2GeO4 have been calculated. In particular, our results support that zinc interstitials are the responsible for the narrow UV band, which is, in turn, split into two components with different temperature dependence behaviour. The origin of the two components is explained on the basis of the particular location of Zn_i in the lattice and agrees with DFT calculations. Furthermore, a kinetic luminescence model is proposed to ascertain the temperature evolution of this UV emission. These results pave the way to exploit defect engineering in achieving functional optoelectronic devices to operate in the UV region.
