Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, College of Physics and Information Science, Hunan Normal University, Changsha 410081, China.
Nanoscale Res Lett. 2013 Jul 5;8(1):314. doi: 10.1186/1556-276X-8-314.
Pure and Mn-doped ZnSe nanobelts were synthesized by a convenient thermal evaporation method. Scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray spectroscopy and corresponding element mapping, and transmission electron microscope were used to examine the morphology, phase structure, crystallinity, composition, and growth direction of as-prepared nanobelts. Raman spectra were used to confirm the effective doping of Mn2+ into ZnSe nanobelts. Micro-photoluminescence (PL) spectra were used to investigate the emission property of as-prepared samples. A dominant trapped-state emission band is observed in single ZnSeMn nanobelt. However, we cannot observe the transition emission of Mn ion in this ZnSeMn nanobelt, which confirm that Mn powder act as poor dopant. There are weak near-bandgap emission and strong 4T1 → 6A1 transition emission of Mn2+ in single ZnSeMnCl2 and ZnSeMn(CH3COO)2 nanobelt. More interesting, the 4T1 → 6A1 transition emission in ZnSeMn(CH3COO)2 nanobelt split into multi-bands. PL mapping of individual splitted sub-bands were carried out to explore the origin of multi-bands. These doped nanobelts with novel multi-bands emission can find application in frequency convertor and wavelength-tunable light emission devices.
通过简便的热蒸发方法合成了纯的和 Mn 掺杂的 ZnSe 纳米带。使用扫描电子显微镜、X 射线粉末衍射、能谱和相应的元素映射以及透射电子显微镜来检查所制备的纳米带的形貌、相结构、结晶度、组成和生长方向。拉曼光谱用于确认 Mn2+ 有效掺杂到 ZnSe 纳米带中。微光致发光（PL）光谱用于研究所制备样品的发射性质。在单个 ZnSeMn 纳米带中观察到主导的俘获态发射带。然而，我们在这个 ZnSeMn 纳米带中无法观察到 Mn 离子的跃迁发射，这证实了 Mn 粉作为较差的掺杂剂。在单个 ZnSeMnCl2 和 ZnSeMn(CH3COO)2 纳米带中存在较弱的近带隙发射和较强的 Mn2+的 4T1→6A1 跃迁发射。更有趣的是，ZnSeMn(CH3COO)2 纳米带中的 4T1→6A1 跃迁发射分裂成多个带。对单个分裂子带进行 PL 映射以探索多带的起源。这些具有新型多带发射的掺杂纳米带可在频率转换器和波长可调谐发光器件中找到应用。
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