具有双色发射的高度稳定的Fe3 +掺杂的CsPbCl3钙钛矿纳米晶体的能量转移动力学,The Journal of Physical Chemistry C

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具有双色发射的高度稳定的Fe3 +掺杂的CsPbCl3钙钛矿纳米晶体的能量转移动力学
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-07-02 , DOI: 10.1021/acs.jpcc.9b04412
Prem Jyoti Singh Rana ₁ , T. Swetha _{1,

2} , Haraprasad Mandal _{2,

3} , Akinori Saeki ₄ , Prakriti Ranjan Bangal _{2,

3} , Surya Prakash Singh _{1,

2}

Affiliation

由于其在光电器件中的潜在应用，开发金属卤化物钙钛矿纳米晶体（NCs）引起了极大的兴趣。在本文中，我们首次报道了Fe ³⁺掺杂的铯铅氯化钙（CsPbCl ₃）钙钛矿型NC的简便合成及其激子弛豫动力学。从主体（CsPbCl ₃）激子到Fe ³⁺掺杂物发生了有效的能量转移，导致粉红色双重发射，其中包括来自CsPbCl ₃的蓝色峰值（410 nm）和铁掺杂态（584 nm）呈红色。有趣的是，发现掺杂铁不仅可以将光致发光的量子产率从1.85％提高到4.32％，而且还可以改善电子显微镜观察到的NC的尺寸和立方形状的均匀性。超快速瞬态吸收研究和整体拟合分析揭示了Fe掺杂对激子弛豫动力学的影响，其中确定了从主激子到Fe ³⁺的有效能量传递，寿命为135 ps。掺杂铁的NCs的另一个突出特点是其在30天之内的高稳定性，并且在高达约50°C的温度下仍保持完好无损。结果为掺铁的CsPbCl ₃的双重发射性质提供了独特的见解。钙钛矿NC，这是高性能钙钛矿设备的重要方面。

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Energy Transfer Dynamics of Highly Stable Fe3+ Doped CsPbCl3 Perovskite Nanocrystals with Dual-Color Emission

Developing metal–halide perovskite nanocrystals (NCs) has attracted great interest due to its potential application in optoelectronic devices. Herein, for the first time we report the facile synthesis of Fe³⁺-doped cesium lead chloride (CsPbCl₃) perovskite NCs along with their exciton relaxation dynamics. Efficient energy transfer occurs from host (CsPbCl₃) exciton to Fe³⁺ dopant, leading to pink-colored dual emission consisting of blue from CsPbCl₃ exitonic peak (410 nm) and red from Fe-dopant state (584 nm). Interestingly, Fe-doping is found not only to enhance the photoluminescence quantum yield from 1.85 to 4.32% but also to improve the homogeneity of size and cubic shape of NCs as observed by electron microscopy. Ultrafast transient absorption studies and global fitting analysis reveal the impact of Fe-doping on the exciton relaxation dynamics, where the efficient energy transfer from host exciton to Fe³⁺ with the lifetime of 135 ps is identified. Another highlighted feature of Fe-doped NCs is its high stability over 30 days and mostly intact intensity up to ∼50 °C. The results provide unique insights into the dual emission properties of Fe-doped CsPbCl₃ perovskite NCs, which is an important aspect for high-performance perovskite devices.

更新日期：2019-07-02

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