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Large-Area Cesium Lead Bromide Perovskite Light-Emitting Diodes Realized by Incorporating a Hybrid Additive
摘要： Encouraging progresses have been made in the development of solution processable perovskite light-emitting diodes (PeLEDs). However, the related fundamental physics of the efficient operation of the large area PeLEDs is still far from adequate. In this work, we report our recent effort in developing a high-performance large area cesium lead bromide (CsPbBr3) PeLEDs through a controlled growth of CsPbBr3 emission layer using a hybrid additive in the CsPbBr3 precursor solution. The hybrid additive comprises a combination of poly(ethylene oxide) (PEO) and cesium carbonate (Cs2CO3). We found that the performance of the CsPbBr3 PeLEDs, prepared using the precursor solution having a hybrid additive of PEO and Cs2CO3, is superior to that of the control PeLEDs, prepared using a pure CsPbBr3 precursor solution in two ways: (1) it helps to suppress both the structural defects and non-radiative recombination-induced leakage current, and (2) it assists in improving the electron-hole current balance. The 1.0×1.5 cm2-sized PeLEDs having a maximum luminance of > 104 cd/m2 has been demonstrated, which is more than three times greater than that of a control PeLED prepared using a pure CsPbBr3 precursor solution (3.0×103 cd/m2).
关键词： hybrid additive,cesium lead bromide,perovskite light-emitting diodes,large area
更新于2025-09-19 17:13:59
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Room temperature synthesis of cesium lead bromide perovskite magic sized clusters with controlled ratio of carboxylic acid and benzylamine capping ligands
摘要： We demonstrate the synthesis of cesium lead bromide (CsPbBr3) perovskite magic sized clusters (PMSCs) and how to control the transformation from CsPbBr3 perovskite quantum dots (PQDs) to PMSCs by varying the amount of organic carboxylic acids (CAs), including mesitylacetic acid (MAA), oleic acid (OA), and phenylacetic acid (PAA), along with benzylamine (BZA) as capping ligands at room temperature. The PQDs and PMSCs are characterized by means of XRD, UV/vis, photoluminescence (PL), time-resolved PL (TRPL), and X-ray-photoelectron spectroscopy (XPS). The concentration of CAs affects the excitonic absorption of both the CsPbBr3 PMSCs (λ ? 389–428 nm) and CsPbBr3 PQDs (λ ? 460–516 nm), with high concentration of CAs favoring CsPbBr3 PMSCs over PQDs. With PAA at 45.45 mM, pure CsPbBr3 PMSCs can be generated, which does not happen for MAA or OA, suggesting that PAA is a stronger ligand than MAA and OA. The results suggest that PMSCs require better passivation or stronger ligands than PQDs. This study establishes a simple and general method for synthesizing CsPbBr3 PMSCs using a combination of BZA and CA capping ligands as a highly effective dual passivation system.
关键词： Controlled ratio of capping ligands,Room temperature,Perovskite quantum dots (PQDs),Perovskite magic sized clusters (PMSCs),Cesium lead bromide perovskite
更新于2025-09-16 10:30:52