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Fe–Li complex emission in ZnO
Journal of Applied Physics ( IF 2.7 ) Pub Date : 2021-02-23 , DOI: 10.1063/5.0041003
Raphael Müller 1 , Martin Mangold 1 , Florian Huber 1 , Matthias Schreck 2 , Ulrich Herr 3 , Klaus Thonke 1
Affiliation  

In this work, we report on three new extremely sharp emission lines in zinc oxide (ZnO) related to iron–lithium complexes. The identification is based on a comparison of hydrothermally grown ZnO with high lithium concentration and a lithium-free sample grown by methane based chemical vapor deposition, which both were implanted with iron. After annealing in a mixed oxygen/argon atmosphere at 800 ° C, the lithium-free sample showed no additional lines besides the well-known emission at 693 nm ( 1.7873 4 eV ), whereas the hydrothermally grown sample emitted three intense and sharp lines in photoluminescence (PL) spectroscopy. These emission lines at 705 nm ( 1.7587 3 eV ), 712 nm ( 1.7415 3 eV ), and 732 nm ( 1.6928 3 eV ) were characterized by temperature dependent high resolution continuous wave (cw) and time-resolved PL spectroscopy, as well as by photoluminescence excitation spectroscopy, and are assigned to different Fe–Li complexes. We find a single thermally activated excited state for each of the complex emission lines, different from the 4 T 1 6 A 1 transition of Fe 3 + with its at least three excited states. While time-resolved photoluminescence measurements of the Fe 3 + transition show a lifetime of 24.9 ± 0.5 ms, we find a reduced lifetime of 8.5 ± 1 ms for the new zero phonon lines, pointing to stronger mixture of the Fe 3d states with surrounding p-orbitals.

中文翻译:

ZnO中铁锂复合物的发射

在这项工作中,我们报告了与铁锂复合物有关的氧化锌(ZnO)中的三种新的极尖锐的发射谱线。鉴定是基于对高锂浓度的水热生长的ZnO和通过甲烷基化学气相沉积法生长的无锂样品进行比较的方法,二者均注入了铁。在氧气/氩气混合气氛中于 800 ° C,不含锂的样品除了在 693 纳米 1.7873 4 电子伏特 ,而水热生长的样品在光致发光(PL)光谱中发出了三条强烈而清晰的线条。这些发射线位于 705 纳米 1.7587 3 电子伏特 712 纳米 1.7415 3 电子伏特 , 和 732 纳米 1.6928 3 电子伏特 通过与温度相关的高分辨率连续波(cw)和时间分辨PL光谱以及光致发光激发光谱对其进行表征,并分配给不同的Fe-Li络合物。我们发现每个复杂的发射谱线都有一个热激活的激发态,这与激发态不同。 4 Ť 1个 6 一种 1个 过渡 3 +至少具有三个激发态 而时间分辨的光致发光测量 3 + 过渡显示一生 24.9 ± 0.5 小姐,我们发现寿命缩短了 8.5 ± 1个 小姐 对于新的零声子线,表明Fe 3d态与周围p轨道的混合更强。
更新日期:2021-02-25
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