High brightness and efficiency blue light-emitting polymer diodes

Grice, Alan W.; Bradley, Donal D. C.; Bernius, Mark T.; Inbasekaran, M.; Wu, Wenbing; Woo, E. P.

doi:10.1063/1.121878

Cited by 631 publications

(397 citation statements)

References 15 publications

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“…First, it is an efficient blue emitter with a high fluorescence quantum efficiency in organic solvents [18,19] as well as water. [20] Second, at a later stage it will be advantageous to extend this concept from monomeric to polymeric emitters, which have already found applications as biosensors.…”

Section: Resultsmentioning

confidence: 99%

Twin Probes as a Novel Tool for the Detection of Single‐Nucleotide Polymorphisms

Ergen

Weber

Jacob

et al. 2006

Chemistry A European J

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Single‐nucleotide polymorphisms (SNPs) are the most common form of DNA sequence variation. There is a strong interest from both academy and industry to develop rapid, sensitive and cost effective methods for SNP detection. Here we report a novel structural concept for DNA detection based on fluorescence dequenching upon hybridization. The so‐called “twin probe” consists of a central fluorene derivative as fluorophore to which two identical oligonucleotides are covalently attached. This probe architecture is applied in homogeneous hybridization assays with subsequent fluorescence spectroscopic analysis. The bioorganic hybrid structure is well suited for sequence specific DNA detection and even SNPs are identified with high efficiency. Additionally, the photophysical properties of the twin probe were investigated. The covalent attachment of two single stranded oligonucleotides leads to strong quenching of the central fluorescence dye induced by the nucleobases. The twin probe is characterized by supramolecular aggregate formation accompanied by red‐shifted emission and broad fluorescence spectra.

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Section: Resultsmentioning

confidence: 99%

Twin Probes as a Novel Tool for the Detection of Single‐Nucleotide Polymorphisms

Ergen

Weber

Jacob

et al. 2006

Chemistry A European J

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“…As diodes with a bottom layer consisting of PVK-h or PVK-h:PBD did not emit in the blue region, we introduced PFO (Chart 4) as an efficient blue emitter. 34 The selected structure for the device was: ITO/PEDOT: PSS/52% PVK-h:48% PFO/40% PVK-l:20% PBD:40% FPtCl/ Ca/Al. A schematic diagram illustrating the HOMO and LUMO levels of each of the materials used is shown in Fig.…”

Section: Woledmentioning

confidence: 99%

Cyclometallated platinum(ii) complexes of 1,3-di(2-pyridyl)benzenes for solution-processable WOLEDs exploiting monomer and excimer phosphorescence

Mróz¹,

Botta²,

Giovanella³

et al. 2011

J. Mater. Chem.

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Two cyclometallated platinum(II) complexes, N^C^N-5-fluoro-1,3-di(2-pyridyl)benzene platinum(II) chloride, FPtCl, and N^C^N-5-methyl-1,3-di(2-pyridyl)benzene platinum(II) isothiocyanate, MePtNCS, have been synthesized and characterized. Both complexes are highly efficient phosphorescent green emitters which can also display excimer emission in the red region. They have been studied as triplet emitters in solution-processed, multilayer organic light-emitting diodes (OLEDs), together with the known complex of 5-methyl-1,3-di(2-pyridyl)benzene, MePtCl, for comparison. The trend in efficiencies of the OLEDs prepared correlates with the charge-trapping properties of the complexes. The most efficiently emitting complex, FPtCl, was used as the dopant in a solution-processed white OLED, employing monomer and excimer emission.

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“…Additionally, we use poly͑9,9-dioctylfluorenyl-2,7-diyl͒ ͑PFO͒, which is a promising material for blue emission light-emitting diodes. 15 It was obtained from American Dye Source, Inc. and used as received.…”

mentioning

confidence: 99%

Direct x-ray detection with conjugated polymer devices

Boroumand

Zhu

Dalton

et al. 2007

Applied Physics Letters

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The authors report the first direct detection of x-ray induced photocurrents in thick films ͑up to 20 m͒ of conjugated polymers. Schottky-based "sandwich" structures were fabricated from layers of either poly͓1-methoxy-4-͑2-ethylhexyloxy͒-phenylenevinylene͔ ͑MEH-PPV͒ or poly͑9,9-dioctylfluorene͒ ͑PFO͒ on indium tin oxide substrates using a top contact of aluminum. Good rectification was achieved from the Al-polymer contact, with a reverse bias leakage current density as low as 4 nA/ cm 2 at an electric field strength of 25 kV/ cm. Irradiation with x-rays from a 50 kV x-ray tube produced a linear increase in photocurrent over a dose rate range from 4 to 18 mGy/ s. The observed x-ray sensitivities of 240 nC/ mGy/ cm 3 for MEH-PPV and 480 nC/ mGy/ cm 3 for PFO structures are comparable to that reported for Si devices. A response time of Ͻ150 ms to pulsed x-ray irradiation was measured with no evidence of long-lived current transients. Conjugated polymers offer the advantage of easy coatability over large areas and on curved surfaces. Their low average atomic number provides tissue-equivalent dosimetric response, with many potential applications including medical x-ray and synchrotron photon detection.

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High brightness and efficiency blue light-emitting polymer diodes

Cited by 631 publications

References 15 publications

Twin Probes as a Novel Tool for the Detection of Single‐Nucleotide Polymorphisms

Twin Probes as a Novel Tool for the Detection of Single‐Nucleotide Polymorphisms

Cyclometallated platinum(ii) complexes of 1,3-di(2-pyridyl)benzenes for solution-processable WOLEDs exploiting monomer and excimer phosphorescence

Direct x-ray detection with conjugated polymer devices

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