I am working on the production of electroluminescent device - QLED according to https://pubs.rsc.org/en/content/articlehtml/2021/nh/d0nh00606h (by spin coating). The layers I am trying to build QLED from are ITO on glass substrate, PEDOT:PSS, PVK, Inp/Zns QD or Perovskite QD, ZnO and Al electrode. So far I've been able to deposit PEDOT:PSS, PVK and quantum dots, which I checked after deposition under a 365nm UV led lamp. After depositing the ZnO nano particles layer over the quantum dots, the go completely dark under the UV. And when coating the Al electrode and plugging it into the circuit,they did not light up. Is it possible that this is due to improper quantum dots combination with ZnO nano particles or imperfect quantum dot layer preparation process, or maybe due to quality of the ZnO nano particles?
used chemicals (from SigmaAldrich)
ITO on glass substrate - 636916 - cleaned with acetone, ipa and cold plasma
PEDO:PSS - 655201 - diluted ipa to a concentration of 0.5% to achieve a layer of about 50 nm in spincoating
PVK - 368350
InP/ZnS QD - 776777 - oleylamine ligands
Perovskite QD - 900746 - oleic acid and oleylamine ligands
ZnO - 808253 - we also tried ZnO according to https://pubs.acs.org/doi/10.1021/nn402870e as an alternative, because we suspected that the quantum dots might be quenching due to the solvent
ZnO nanoparticles are n-type semiconductors with a high conduction band energy. When quantum dots come into contact with ZnO, electrons in the conduction band of the QDs can transfer to the conduction band of ZnO, leading to quenching of photoluminescence.
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