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Blue-Emitting CsPbCl3 Nanocrystals: Impact of Surface Passivation for Unprecedented Enhancement and Loss of Optical Emission
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-11-26 00:00:00 , DOI: 10.1021/acs.jpclett.8b03047
Rakesh Kumar Behera 1 , Samrat Das Adhikari 1 , Sumit Kumar Dutta 1 , Anirban Dutta 1 , Narayan Pradhan 1
Affiliation  

High-energy-emitting CsPbCl3 nanocrystals have shown significant loss and enhancement of their emission intensity (∼40–50 folds) during purification and surface treatments, respectively. This confirms that the surfaces of these nanocrystals are very sensitive. In this Letter, physical insights of the interface bindings on the surface of these blue-emitting CsPbCl3 nanocrystals with different passivating agents and their consequential impact on purification are investigated. Using various metal chlorides irrespective of the charge and size of the metal ions, metal acetates, and nonmetal chloride, the predominant influence of chloride ions in helping retrieve/intensify the blue emission is established. The purification processes are observed to be very delicate, and successive purifications with introduction of polar nonsolvents led to the transformation of an emitting cubic CsPbCl3 phase to nonemitting tetragonal CsPb2Cl5 phase nanocrystals irreversibly. The impact of various salt additions only temporarily helped in enhancing the emission, but the phase change remained inevitable upon successive purification. However, as a remedy, by in situ use of alkylammonium chloride salt in high-temperature reactions, the surface binding was improved, and significant emission as well as the phase could be retained with successive purifications.

中文翻译:

发射蓝光的CsPbCl 3纳米晶体:表面钝化对空前增强和光发射损失的影响

高能发射的CsPbCl 3纳米晶体在纯化和表面处理过程中分别显示出明显的损失和发射强度的增强(约40至50倍)。这证实了这些纳米晶体的表面非常敏感。在这封信中,对这些发蓝光的CsPbCl 3表面上的界面结合的物理见解研究了具有不同钝化剂的纳米晶体及其对纯化的影响。无论金属离子,金属乙酸盐和非金属氯化物的电荷和大小如何,都使用各种金属氯化物,可以确定氯离子在帮助回收/增强蓝色发射方面的主要影响。观察到纯化过程非常精细,并且通过引入极性非溶剂进行的连续纯化导致了发射立方CsPbCl 3相向非发射四方CsPb 2 Cl 5的转化。相纳米晶体不可逆转。各种盐添加的影响只是暂时地帮助增加了排放,但是相继纯化后仍不可避免地发生相变。但是,作为一种补救措施,通过在高温反应中原位使用烷基氯化铵盐,可以改善表面结合力,并且可以通过连续纯化保留大量的发射物以及该相。
更新日期:2018-11-26
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