White emission from nano-structured top-emitting organic light-emitting diodes based on a blue emitting layer

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We demonstrated that white emission can be obtained from nano-structured top-emitting organic light-emitting diodes (TEOLEDs) based on a blue emitting layer (EML). The nano-structured TEOLEDs were fabricated on nano-patterned substrates, in which both optical micro-cavity and scattering effects occur simultaneously. Due to the combination of these two effects, the electroluminescence spectra of the nano-structured device with a blue EML exhibited not only blue but also yellow colours, which corresponded to the intrinsic emission of the EML and the resonant emission of the micro-cavity effect. Consequently, it was possible to produce white emission from nano-structured TEOLEDs without employing a multimode micro-cavity. The intrinsic emission wavelength can be varied by altering the dopant used for the EML. Furthermore, the emissive characteristics turned out to be strongly dependent on the nano-pattern sizes of the nano-structured devices.
Publisher
IOP PUBLISHING LTD
Issue Date
2013-03
Language
English
Article Type
Article
Keywords

ELECTROPHOSPHORESCENT DEVICES; CRYSTALS; EXCITONS

Citation

JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.46, no.9

ISSN
0022-3727
DOI
10.1088/0022-3727/46/9/095107
URI
http://hdl.handle.net/10203/174537
Appears in Collection
CBE-Journal Papers(저널논문)
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