In previous reports of the literature, ZnO nanoparticles were unexceptionally used as the electron transportation material in highly efficient CdSe-based quantum dot light-emitting diodes (QD-LEDs). However, as an amphoteric oxide, ZnO nanoparticles are chemically unstable in air. Here, we utilize quantum-sized SnO₂ nanoparticles as the electron transportation layer (ETL) of CdSe-based QD-LEDs. Decreasing the size of SnO₂ nanoparticles will upshift the conduction band from −4.50 to −3.84 eV based on the quantum size effect, which is beneficial to facilitate electron injection into the QD emitting layer. Our investigations show that QD-LEDs based on quantum-sized SnO₂ nanoparticles exhibit comparable electroluminescence properties and higher stability in contrast to ZnO nanoparticle-based QD-LEDs, demonstrating that small-sized SnO₂ nanoparticles have a bright prospect due to the ETL in QD-LEDs.

中文翻译：

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导带上移的量子尺寸SnO2纳米粒子：一种用于量子点发光二极管的有前途的电子传输材料。

在先前的文献报道中，ZnO纳米粒子毫无例外地被用作高效的基于CdSe的量子点发光二极管（QD-LED）中的电子传输材料。然而，作为两性氧化物，ZnO纳米粒子在空气中化学不稳定。在这里，我们利用量子大小的SnO ₂纳米颗粒作为基于CdSe的QD-LED的电子传输层（ETL）。基于量子尺寸效应，减小SnO ₂纳米粒子的尺寸将使导带从-4.50升至-3.84 eV，这有利于促进电子注入QD发射层。我们的研究表明，基于量子尺寸SnO _2的QD-LED与基于ZnO纳米颗粒的QD-LED相比，纳米颗粒具有可比的电致发光性能和更高的稳定性，这表明由于QD-LED中的ETL ，小尺寸的SnO ₂纳米颗粒具有广阔的前景。