Ultrabroadband Tuning and Fine Structure of Emission Spectra in Lanthanide Er-Doped ZnSe Nanosheets for Display and Temperature Sensing
Ultrabroadband Tuning and Fine Structure of Emission Spectra in Lanthanide Er-Doped ZnSe Nanosheets for Display and Temperature Sensing
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用于显示和温度传感的稀土掺铒 ZnSe 纳米片发射光谱的超宽带调谐和精细结构。
DOI：
10.1021/acsnano.0c07547
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发表时间：
2020-11-24
期刊：
影响因子：
17.1
通讯作者：
Hao, Jianhua
中科院分区：
文献类型：
--
作者：
Liu, Yuan;Bai, Gongxun;Hao, Jianhua
在二维（2D）纳米材料中实现多色发光将为一系列下一代纳米级光电器件提供潜力。此外，精细结构谱线发射和检测的结合可能会进一步丰富功能纳米材料的研究和应用。在此，镧系元素掺杂策略已被用于合成2D ZnSe：Er 3+纳米片，以实现精细结构的单光子发光光谱。实现了同时上转换和下转换发射，其可以覆盖从紫外到可见光到近红外的超宽带光学范围。通过研究4K下发射光谱的低温精细结构，我们观察到了丰富的亚能级电子能量跃迁，阐明了Er 3+离子在二维ZnSe纳米片中的电子结构。随着温度的变化，这些纳米片在980和365 nm激发下表现出可调的多色发光。利用Er 3+离子的不同子能级跃迁，开发的2D ZnSe：Er 3+光学温度传感器显示出高的绝对（15.23%K-1）和相对灵敏度（8.61%K-1），这是上级传统的Er 3+激活的上转换发光纳米温度计。这些研究结果表明，Er 3+掺杂的ZnSe纳米材料具有直接和宽的带隙，具有潜在的应用在未来的低维光子和传感器件在2D的限制。
Realizing multicolored luminescence in two-dimensional (2D) nanomaterials would afford potential for a range of next-generation nanoscale optoelectronic devices. Moreover, combining fine structured spectral line emission and detection may further enrich the studies and applications of functional nanomaterials. Herein, a lanthanide doping strategy has been utilized for the synthesis of 2D ZnSe:Er3+ nanosheets to achieve fine-structured, multicolor luminescence spectra. Simultaneous upconversion and downconversion emission is realized, which can cover an ultrabroadband optical range, from ultraviolet through visible to the near-infrared region. By investigating the low-temperature fine structure of emission spectra at 4 K, we have observed an abundance of sublevel electronic energy transitions, elucidating the electronic structure of Er3+ ions in the 2D ZnSe nanosheet. As the temperature is varied, these nanosheets exhibit tunable multicolored luminescence under 980 and 365 nm excitation. Utilizing the distinct sublevel transitions of Er3+ ions, the developed 2D ZnSe:Er3+ optical temperature sensor shows high absolute (15.23% K-1) and relative sensitivity (8.61% K-1), which is superior to conventional Er3+-activated upconversion luminescent nanothermometers. These findings imply that Er3+-doped ZnSe nanomaterials with direct and wide band gap have the potential for applications in future low-dimensional photonic and sensing devices at the 2D limit.