Plass Christian T, Bonino Valentina, Ritzer Maurizio, Jäger Lukas R, Rey-Bakaikoa Vicente, Hafermann Martin, Segura-Ruiz Jaime, Martínez-Criado Gema, Ronning Carsten
Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany.
ESRF - The European Synchrotron, 71 Avenue des Martyrs, Grenoble, 38043, France.
Adv Sci (Weinh). 2022 Nov 20;10(1):e2205304. doi: 10.1002/advs.202205304.
The dynamics of color centers, being a promising quantum technology, is strongly dependent on the local environment. A synergistic approach of X-ray fluorescence analysis and X-ray excited optical luminescence (XEOL) using a hard X-ray nanoprobe is applied. The simultaneous acquisition provides insights into compositional and functional variations at the nanoscale demonstrating the extraordinary capabilities of these combined techniques. The findings on cobalt doped zinc oxide nanowires show an anticorrelation between the band edge emission of the zinc oxide host and the intra-3d cobalt luminescence, indicating two competing recombination paths. Moreover, time-resolved XEOL measurements reveal two exponential decays of the cobalt luminescence. The fast and newly observed one can be attributed to a recombination cascade within the cobalt atom, resulting from direct excitation. Thus, this opens a new fast timescale for potential devices based on cobalt color centers in ZnO nanowires in photonic circuits.
作为一种很有前景的量子技术，色心动力学强烈依赖于局部环境。采用了一种协同方法，即使用硬X射线纳米探针进行X射线荧光分析和X射线激发光致发光（XEOL）。同时采集数据能够深入了解纳米尺度上的成分和功能变化，展示了这些组合技术的非凡能力。关于钴掺杂氧化锌纳米线的研究结果表明，氧化锌主体的带边发射与3d内钴发光之间存在反相关关系，这表明存在两条相互竞争的复合路径。此外，时间分辨XEOL测量揭示了钴发光的两个指数衰减。快速且新观察到的衰减可归因于钴原子内的复合级联，这是由直接激发导致的。因此，这为基于ZnO纳米线中钴色心的光子电路潜在器件开启了一个新的快速时间尺度。
