ZnMgO
nanoparticles are widely used as the electron transport layer
for quantum dot light-emitting diode (QLED) applications but suffer
serious stability issues. In this work, we developed siloxane-modified
ZnMgO nanoparticles to address stability issues. At room temperature,
colloidal ZnMgO nanoparticles usually undergo aggregation-induced
turbidity within 3 days. With the addition of a tetramethyl orthosilicate
(TMOS) precursor into the preformed ZnMgO nanoparticles, the siloxane-modified
ZnMgO nanoparticles show enhanced colloidal stability, which is stable
for more than 40 days. We further compared the device stabilities
of unmodified and siloxane-modified ZnMgO nanoparticles. The results
show that siloxane-modified ZnMgO-based devices show enhanced operation
and storage stability. In particular, the operational lifetime was
improved by 59.3%, and the luminance at 5 V can be kept at about 75%
after 80 days of storage. In all, this work provides an effective
strategy to address the stability issues of ZnMgO nanoparticle-based
optoelectronics.