Surface Modification of ZnMgO Nanoparticles with Beta-Diketone Based Ligands
발표자
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초록
내용
ZnMgO is the most adopted as the electron transport layer material for electroluminescence-quantum dot (EL-QD) devices. The high electron mobility of ZnO, which is generally much faster than the hole transport layer, can be tuned by Mg doping to achieve the optimal charge balance. The excellent colloidal stability also facilitates solution processing. However, ZnMgO nanoparticles (NPs) have a challenge: excessive surface defects. Surface defects cause severe interfacial exciton quenching, greatly affecting device lifetime and performance. We approached this problem by exchanging beta-diketone-based ligands to decrease the surface defects of ZnMgO NPs. The results showed that ZnMgO with the simplest structural ligand exchange reduced surface defects by up to 40%, resulting in up to 6.5% EQE and 2.8 times improved device lifetime. This successfully demonstrated that optimal device performance can be achieved by minimizing traps in the ZnMgO-based electron transport layer.