Doped Two Dimensional Metal Chalcogenides as Printable White Light Phosphors

作为可印刷白光荧光粉的掺杂二维金属硫属化物

• 批准号: 2321571
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2321571
• 关键词: Doped; Two; Dimensional; Metal; Chalcogenides

Doping of 2D metal dichalcogenides (TMDCs) in particular, provides a facile route by which to produce new advanced composite nanomaterials that have advanced optoelectronic properties. [1] Doping of two-dimensional TMDCs with lanthanide ions provides an attractive opportunity by which to extend the latter's advanced materials properties. Lanthanide(III) ions (Ln3+) have long been investigated for their unique photophysical properties, which include long lifetimes (in ms), intense line-like emission profiles and, due to the lack of crystal field preference in each ion, the ability to tune photoluminescence or magnetic properties by judicious choice of lanthanide ion e.g. Eu3+ for red photonic emission, Tb3+ for green emission, Yb3+ for emission in the near infrared and Gd3+ for intense paramagnetism.[2]We have recently shown that 2D molybdenum disulfide nanosheets can be functionalised with both Eu3+ and Gd3+ complexes simultaneously. The resulting nanomaterials display long photoluminescence emission lifetimes of 0.8 ms from the Eu3+ emission in the red region of the electromagnetic spectrum (570 - 720 nm), derived from the 5D0 -> 7Fj electronic f-f transitions, whilst having strong paramagnetic response in EPR spectra, and thus could be used as a bimodal optical probe / magnetic resonance imaging contrast agent. [3]We now wish to extend the properties that we can impart to 2D materials by exploring the whole range of lanthanide elements available for doping. Doping with mixed optical emitting lanthanide complexes (e.g. Sm3+, Dy3+, Eu3+ and Tb3+) could lead to solid state phosphors which have white light emission. Printing of these new materials could lead to flexible white light phosphors for flexible lighting. The project will involve the synthesis and characterisation of Ln-doped 2D materials, the study of their photophysics by various techniques including temperature-dependent photoluminescence and absorption spectroscopy, confocal microscopy and quantum yield measurements. Transient photoluminescence and ultrafast transient absorption spectroscopy will enable carrier dynamics to be determined down to a sub-picosecond time-scale and will give us insight into the radiative and non-radiative pathways [4]. Printable inks will be developed and their properties elucidated.References[1] Tedstone et al Chem Mater 2016, 28, 1965. [2] Lewis et al Coord. Chem. Rev. 2014, 273, 213. [3] McAdams et al, Adv Func. Mater. 2017, 1703646 [4] Kime et al J. Phys. Chem. C 2017, 121, 22415.

特别是二维金属二硫属化物（TMDC）的掺杂，为生产具有先进光电特性的新型先进复合纳米材料提供了一条简便的途径。 [1] 用镧系离子掺杂二维 TMDC 为扩展后者的先进材料性能提供了一个有吸引力的机会。长期以来，镧系 (III) 离子 (Ln3+) 因其独特的光物理性质而受到研究，其中包括长寿命（以毫秒为单位）、强烈的线状发射轮廓，以及由于每种离子缺乏晶体场偏好，能够通过明智地选择镧系离子（例如，稀土离子）来调节光致发光或磁性。 Eu3+ 用于红色光子发射，Tb3+ 用于绿色发射，Yb3+ 用于近红外发射，Gd3+ 用于强顺磁性。[2]我们最近表明，二维二硫化钼纳米片可以同时用 Eu3+ 和 Gd3+ 配合物进行功能化。由此产生的纳米材料显示出来自电磁波谱红色区域（570 - 720 nm）的 Eu3+ 发射的 0.8 ms 长光致发光发射寿命，源自 5D0 -> 7Fj 电子 f-f 跃迁，同时在 EPR 谱中具有强顺磁响应，因此可用作双峰光学探针/磁共振成像对比 代理人。 [3]我们现在希望通过探索可用于掺杂的整个范围的镧系元素来扩展我们可以赋予二维材料的特性。掺杂混合发光镧系元素络合物（例如 Sm3+、Dy3+、Eu3+ 和 Tb3+）可以产生具有白光发射的固态磷光体。这些新材料的印刷可以产生用于柔性照明的柔性白光磷光体。该项目将涉及掺 Ln 二维材料的合成和表征，通过各种技术研究其光物理学，包括温度依赖性光致发光和吸收光谱、共焦显微镜和量子产率测量。瞬态光致发光和超快瞬态吸收光谱将使载流子动力学能够在亚皮秒时间尺度内确定，并使我们深入了解辐射和非辐射路径[4]。将开发可印刷油墨并阐明其特性。参考文献[1] Tedstone et al Chem Mater 2016, 28, 1965。 [2] Lewis et al Coord。化学。 Rev. 2014, 273, 213。 [3] McAdams 等人，Adv Func。马特。 2017, 1703646 [4] Kime 等 J. Phys。化学。 C 2017, 121, 22415。

项目成果

Synthesis of High Entropy Lanthanide Oxysulfides via the Thermolysis of a Molecular Precursor Cocktail.

• DOI: 10.1021/jacs.1c08995
• 发表时间: 2021-12
• 期刊: Journal of the American Chemical Society
• 影响因子: 15
• 作者: B. Ward-O’Brien;E. Pickering;Ruben Ahumada-Lazo;Charles T Smith;X. Zhong;Y. Aboura;F. Alam;D. Binks;T. Burnett;David J. Lewis

Quantum Confined High-Entropy Lanthanide Oxysulfide Colloidal Nanocrystals.

• DOI: 10.1021/acs.nanolett.2c01596
• 发表时间: 2022-10-26
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Ward-O'Brien, Brendan;McNaughter, Paul D.;Cai, Rongsheng;Chattopadhyay, Amrita;Flitcroft, Joseph M.;Smith, Charles T.;Binks, David J.;Skelton, Jonathan M.;Haigh, Sarah J.;Lewis, David J.
• 通讯作者: Lewis, David J.