Energy level tuning of blue emitting and electron transporting vinylene bis(vinyl quinolinyl)benzene derivatives: synthesis, characterisation, thin film characterisation and performance in OLEDs

A number of thermally stable, conjugated, blue-emitting vinylene bis(vinyl quinolinyl)benzene derivatives were prepared and three of them were characterised by single crystal X-ray crystallography. They exhibit blue to bluish-green emission (fluorescence and electroluminescence) depending on the sub...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2015-01, Vol.3 (26), p.6652-6667
Main Authors: Kathirgamanathan, Poopathy, Surendrakumar, Sivagnanasundram, Ravichandran, Seenivasagam, Kumaraverl, Muttulingam, Antipan Lara, Juan, Ganeshamurugan, Subramaniam, Bushby, Lisa M., Tidey, Jeremiah P., Blake, Alexander J.
Format: Article
Language:English
Subjects:
Derivatives
Devices
Electroluminescence
Emittance
Fluorescence
Organic light emitting diodes
Phenyls
Thin films
Tuning
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Summary:A number of thermally stable, conjugated, blue-emitting vinylene bis(vinyl quinolinyl)benzene derivatives were prepared and three of them were characterised by single crystal X-ray crystallography. They exhibit blue to bluish-green emission (fluorescence and electroluminescence) depending on the substituents. Their effectiveness as electron transporters in red and green organic light emitting diodes (OLEDs) has been explored. The phenyl and naphthyl substituted compounds were found to be superior to Alq 3 in OLEDs as electron transporters. The electron mobility of the parent molecule, phenyl, thienyl and naphthyl substituted compounds were determined to be 8.0 × 10 −7 , 3.3 × 10 −6 , 5.5 × 10 −6 and 8.0 × 10 −6 cm 2 V −1 s −1 respectively. Lifetime measurements were carried out for the red and green fluorescent devices and compared with Alq 3 as an electron transporter. Some vinylene bis(vinyl quinolinyl)benzene derivatives show significantly longer lifetimes than analogous devices made with Alq 3 as the electron transport layer. Purple to dark blue emitting devices were achieved from two of the derivatives.
ISSN:2050-7526
2050-7534
DOI:10.1039/C5TC00932D