Negative differential resistance phenomena in colloidal quantum dots-based organic light-emitting diodes

作者：Yang, Shengyi^*; Liu, Peng; Guo, Sanwei; Zhang, Li; Yang, Dan; Jiang, Yurong; Zou, Bingsuo

来源：Applied Physics Letters, 2014, 104(3): 033301.

DOI：10.1063/1.4862889

• INTERMOLECULAR INTERACTION
• TRANSPORT
• MOLECULE
• DEVICE
• TEMPERATURE

The influence of ligands on the electrical behavior of CdSe/ZnS core-shell colloidal quantum dots (CQDs)-based organic light-emitting diodes is presented. Negative differential resistance (NDR) phenomena at room temperature are observed from single-layer device ITO/poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)/CQDs/Al in which the original capping ligand tri-n-octylphosphine oxide (TOPO) of CQDs is exchanged with oleylamine, as well as in both bilayer device ITO/PEDOT: PSS/CQDs/BCP(10 nm)/Al and trilayer device ITO/PEDOT: PSS/CQDs/BCP(10 nm)/Alq(3)(10 nm)/Al. However, such a kind of NDR phenomenon disappears if TOPO is exchanged with hexadecylamine. Therefore, NDR phenomenon depends greatly on the ligands of the CQDs, and the origin of NDR from these devices is discussed.

• 单位
  北京理工大学