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Highly Luminescent and Stable Perovskite Nanocrystals with Octylphosphonic Acid as a Ligand for Efficient Light-Emitting Diodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acsami.7b17166
Yeshu Tan 1 , Yatao Zou 1 , Linzhong Wu 1 , Qi Huang 1 , Di Yang 1 , Min Chen 1 , Muyang Ban 1 , Chen Wu 1 , Tian Wu 1 , Sai Bai 2 , Tao Song 1 , Qiao Zhang 1 , Baoquan Sun 1
Affiliation  

All inorganic perovskite nanocrystals (NCs) of CsPbX3 (X = Cl, Br, I, or their mixture) are regarded as promising candidates for high-performance light-emitting diode (LED) owing to their high photoluminescence (PL) quantum yield (QY) and easy synthetic process. However, CsPbX3 NCs synthesized by the existing methods, where oleic acid (OA) and oleylamine (OLA) are generally used as surface-chelating ligands, suffer from poor stability due to the ligand loss, which drastically deteriorates their PL QY, as well as dispersibility in solvents. Herein, the OA/OLA ligands are replaced with octylphosphonic acid (OPA), which dramatically enhances the CsPbX3 stability. Owing to a strong interaction between OPA and lead atoms, the OPA-capped CsPbX3 (OPA-CsPbX3) NCs not only preserve their high PL QY (>90%) but also achieve a high-quality dispersion in solvents after multiple purification processes. Moreover, the organic residue in purified OPA-CsPbBr3 is only ∼4.6%, which is much lower than ∼29.7% in OA/OLA-CsPbBr3. Thereby, a uniform and compact OPA-CsPbBr3 film is obtained for LED application. A green LED with a current efficiency of 18.13 cd A–1, corresponding to an external quantum efficiency of 6.5%, is obtained. Our research provides a path to prepare high-quality perovskite NCs for high-performance optoelectronic devices.

中文翻译:

以辛基膦酸为配体的高效发光二极管的高发光且稳定的钙钛矿纳米晶体

CsPbX 3的所有无机钙钛矿纳米晶体(NCs)(X = Cl,Br,I或它们的混合物)由于具有高的光致发光(PL)量子产率而被认为是高性能发光二极管(LED)的有前途的候选者( QY)和易于合成的过程。然而,通过现有方法合成的CsPbX 3 NCs,其中油酸(OA)和油胺(OLA)通常用作表面螯合配体,由于配体损失而导致稳定性差,这也严重破坏了其PL QY。作为在溶剂中的分散性。在此,OA / OLA配体被辛基膦酸(OPA)取代,这大大增强了CsPbX 3的稳定性。由于OPA和铅原子之间的强相互作用,OPA封端的CsPbX 3(OPA-CsPbX 3)NC不仅保留了其较高的PL QY(> 90%),而且在多次纯化后可实现在溶剂中的高质量分散。此外,纯化的OPA-CsPbBr 3中的有机残留仅为〜4.6%,远低于OA / OLA-CsPbBr 3中的〜29.7%。由此,获得用于LED应用的均匀且致密的OPA-CsPbBr 3膜。获得了绿色LED,其电流效率为18.13 cd A –1,对应于6.5%的外部量子效率。我们的研究为制备用于高性能光电设备的高质量钙钛矿NC提供了一条途径。
更新日期:2018-01-16
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