Enhanced Photoluminescence and Stability of CH3NH3PbBr3 Perovskite Nanocrystals with Protonated Melamine
Enhanced Photoluminescence and Stability of CH3NH3PbBr3 Perovskite Nanocrystals with Protonated Melamine
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质子化三聚氰胺增强 CH3NH3PbBr3 钙钛矿纳米晶体的光致发光和稳定性
DOI：
10.1002/cnma.201800006
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发表时间：
2018-04
期刊：
影响因子：
3.8
通讯作者：
Jin Zhong Zhang
中科院分区：
文献类型：
--
作者：
Sangni Wang;Furong Huang;Liya Zhou;Jianwu Wei;Youling Xin;Peng Jin;Zhuo Cai;Zuodong Yin;Qi Pang;Jin Zhong Zhang
CH 3 NH3 PbBr 3钙钛矿纳米晶（PNC）的表面对决定其光学性质和稳定性起着至关重要的作用。引入封端配体可以增强光致发光（PL），减少非辐射复合，并提高稳定性。在这里，我们报告了一种简单的合成CH 3 NH3 PbBr 3 PNC与强大的和高度稳定的绿色PL使用三聚氰胺（Mela）作为一个简单的和低成本的封端配体。所得CH 3 NH3 PbBr 3/Mela PNC具有立方相晶体结构，平均粒径为5.29±0.06 nm。 CH 3 NH3 PbBr 3/Mela PNC的光吸收和PL在可见光范围内可调，PL量子产率（QY）达到52.3%，而纯CH 3 NH3 PbBr 3 PNC的QY仅为0.4%。NH3+和富电子氮原子之间的协同效应以及p-p堆积能力可能有助于通过有效钝化PNC的陷阱态来增强PL。此外，由于三嗪环的空间体积，三聚氰胺封端的PNC在质子溶剂中显示出高稳定性，这是由于平面结构以及三聚氰胺的氢键，这防止了溶剂分子到达PNC的核并与之反应。这项研究证明了一个简单而有效的方法来稳定PNC的潜在应用，如太阳能电池和LED。
The surface of CH3NH3PbBr3perovskite nanocrystals (PNCs) plays a critical role in determining their optical properties and stability. The introduction of capping ligands can enhance photoluminescence (PL), reduce non‐radiative recombination, and improve stability. Here, we report a facile synthesis of CH3NH3PbBr3PNCs with strong and highly stable green PL using melamine (Mela) as a simple and low‐cost capping ligand. The resulting CH3NH3PbBr3/Mela PNCs have cubic phase crystal structure with an average particle size of 5.29±0.06 nm. The optical absorption and PL of the CH3NH3PbBr3/Mela PNCs with narrow bandwidth can be tuned within the visible region, and the PL quantum yield (QY) reached 52.3% compared to 0.4% the pristine CH3NH3PbBr3PNCs. A synergistic effect between NH3+and the electron‐rich nitrogen atoms together with p‐p stacking capacity, likely contributes to enhance the PL by effectively passivating of the trap states of PNCs. Furthermore, melamine‐capped PNCs show high stability in protic solvents as a result of the steric bulkiness of the triazine rings, owing to the planar structure together with hydrogen bonding of melamine, which prevents solvent molecules from reaching and reacting with the core of PNCs. This study demonstrates a simple and effective approach for stabilizing PNCs for potential applications such as solar cells and LEDs.
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影响因子：
8.4
作者：
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通讯作者：
Junping Xu;Guanglu Wu;Zhiqiang Wang;Xi Zhang
影响因子：
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影响因子：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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