Quantum-Sized SnO2 Nanoparticles with Upshifted Conduction Band: A Promising Electron Transportation Material for Quantum Dot Light-Emitting Diodes

Langmuir : the ACS Journal of Surfaces and Colloids
Yue LiuDaocheng Pan

Abstract

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.

References

Sep 28, 2005·Angewandte Chemie·Yongan Andrew YangY Charles Cao
Jul 16, 2014·ACS Applied Materials & Interfaces·Wenyu JiJialong Zhao
Oct 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·Hui FangJohn A Rogers
Sep 20, 2017·Nanoscale·Krishna P AcharyaPaul H Holloway
Oct 25, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Junsang ChoHak-Sung Jung

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