Electroluminescence from doped ZnS nanocrystals/polymer composite systems

Yi Yang; Jinman Huang; Shanhua Xue; Yuguang Ma; Shiyong Liu; Jiachong Shen

doi:10.1117/12.279337

1 December 1997 Electroluminescence from doped ZnS nanocrystals/polymer composite systems

Yi Yang, Jinman Huang, Shanhua Xue, Yuguang Ma, Shiyong Liu, Jiachong Shen

Proceedings Volume 3148, Organic Light-Emitting Materials and Devices; (1997) https://doi.org/10.1117/12.279337
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

ZnS, ZnS:Cu and ZnS/CdS nanocrystals were synthesized in polymer matrices with a variety of methods. TEM, absorption spectra and small-angle x-ray scattering studies showed that the particle sizes of ZnS, ZnS:Cu and ZnS/CdS nanocrystals were 3.0, 3.2 and 2.0 nm respectively. Electron diffraction results showed that the ZnS and CdS nanocrystals have the hexagonal structures and Cu ions existed in ZnS with the form of Cu₂S. A hole transport material tetraphenylbenzidine (TPB) were also doped into ZnS nanocrystals/polymer to improve the electroluminescent (EL) property of the ZnS nanocrystals. ZnS:Cu, ZnS/CdS and TPB/ZnS nanoparticles/polymer composite as emitters were used to fabricate a single layer structure light-emitting diode between ITO and Al electrodes respectively. The photoluminescence and EL properties of these doped systems were studied. These EL devices had low turn on voltage and the blue electroluminescence from Cu:ZnS and ZnS/CdS and a violet-blue electroluminescence from TPB:ZnS were observed respectively at room temperature under ambient air. The EL mechanism is also discussed.

Citation Download Citation

Yi Yang, Jinman Huang, Shanhua Xue, Yuguang Ma, Shiyong Liu, and Jiachong Shen "Electroluminescence from doped ZnS nanocrystals/polymer composite systems", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); https://doi.org/10.1117/12.279337

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