Article

An ionic molecular glass as electron injection layer for efficient polymer light-emitting diode.

Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Special Functional Materials, MOE, South China University of Technology (SCUT), Guangzhou 510640, P. R. China.
Macromolecular Rapid Communications (impact factor: 4.6). 09/2009; 30(17):1484-91. DOI:10.1002/marc.200900253
Source: PubMed

ABSTRACT An ionic molecular glass based on a dendronized monoammonium salt has been facilely synthesized and utilized as an interfacial electron-injection layer in a light-emitting diode (LED). The characterization of a yellow-green LED that involves an Al cathode and a thin layer of the new compound spin cast from a methanol solution has shown device performances comparable to those obtained with a Ba/Al cathode. Photovoltaic measurements under white light irradiation reveal that a thin layer of the new compound can significantly increase the built-in potential and thus facilitate electron injection from an Al cathode. Furthermore, it is interesting to observe that the new ionic salt could undergo reorganization on the emissive conjugated polymer layer, which leads to the formation of nearly uniform nanoaggregates.

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Keywords

built-in potential
 
dendronized monoammonium salt
 
device performances comparable
 
emissive conjugated polymer layer
 
interfacial electron-injection layer
 
ionic molecular glass
 
light-emitting diode
 
methanol solution
 
new compound
 
new ionic salt
 
Photovoltaic measurements
 
thin layer
 
uniform nanoaggregates
 
white light irradiation