Examination of EL and PL properties of MCHM-PPV and MEH-PPV: a study towards introduction of a new series of thin film EL devices

Choo, Dong Joon; Talaie, A.; Lee, Y.K.; Jang, Jin; Park, S.H.; Huh, Gene; Yoo, Kyung Hee; Lee, J.Y.

doi:10.1016/s0040-6090(99)00978-5

Cited by 17 publications

(9 citation statements)

References 11 publications

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“…The turn‐on voltage of this device was 3.3 V, which was close to the value reported by another group 16. The EL intensity was measured to be 550 cd/m 2 at 6.1 V, which was higher than those of the MEH‐PPV devices reported previously (<100 cd/m 2 at 6.1 V) 22–26. The obtained luminescence efficiency was 0.43 cd/A, which was higher than the values reported by other groups (0.0023–0.24 cd/A) 26, 27.…”

Section: Resultssupporting

confidence: 82%

High‐quality poly[2‐methoxy‐5‐(2′‐ethylhexyloxy)‐p‐phenylenevinylene] synthesized by a solid–liquid two‐phase reaction: Characterizations and electroluminescence properties

Shi

Chen

et al. 2004

J. Polym. Sci. A Polym. Chem.

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Poly[2‐methoxy‐5‐(2′‐ethylhexyloxy)‐p‐phenylenevinylene] (MEH‐PPV) with a molar mass of 26–47 × 104 g mol−1 and a polydispersity of 2.5–3.2 was synthesized by a liquid–solid two‐phase reaction. The liquid phase was tetrahydrofuran (THF) containing 1,4‐bis(chloromethyl)‐2‐methoxy‐5‐(2′‐ethylhexyloxy)benzene as the monomer and a certain amount of tetrabutylammonium bromide as a phase‐transfer catalyst. The solid phase consisted of potassium hydroxide particles with diameters smaller than 0.5 mm. The reaction was carried out at a low temperature of 0 °C and under nitrogen protection. No gelation was observed during the polymerization process, and the polymer was soluble in the usual organic solvents, such as chloroform, toluene, THF, and xylene. A polymer light‐emitting diode was fabricated with MEH‐PPV as an active luminescent layer. The device had an indium tin oxide/poly(3,4‐ethylenedioxylthiophene) (PEDOT)/MEH‐PPV/Ba/Al configuration. It showed a turn‐on voltage of 3.3 V, a luminescence intensity at 6.1 V of 550 cd/m2, a luminescence efficiency of 0.43 cd/A, and a quantum efficiency of 0.57%. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 3049–3054, 2004

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Section: Resultssupporting

confidence: 82%

High‐quality poly[2‐methoxy‐5‐(2′‐ethylhexyloxy)‐p‐phenylenevinylene] synthesized by a solid–liquid two‐phase reaction: Characterizations and electroluminescence properties

Shi

Chen

et al. 2004

J. Polym. Sci. A Polym. Chem.

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“…PPV has many good characteristics such as good charge carrier mobility, formation of high molecular weight polymers, soluble in common solvents, processability, and highly luminescence intensity which make PPV more attractive than many other conjugated systems 22. Bulky‐PPVs were reported using cycloalkoxyl,23–25 adamantyl,26, 27 cholestanyl,28, 29 aryloxy,30–33 and inorganic pendants like silyl34 and silsesquioxane35, 36 in the conjugated backbone. However, most of the successful bulky‐PPVs were found insoluble or partially soluble in common solvents, which hampered their processability, complete structural‐characterization, and so forth 26, 28.…”

Section: Introductionmentioning

confidence: 99%

The problem of detecting and managing depression in the rheumatology clinic

Nicassio¹

2008

Arthritis & Rheumatism

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“…Poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene)s ( MEH - PPV ) and its copolymers are one of the most thoroughly studied π-conjugated polymers because of their potential applications in polymer LEDs and plastic solar cells − cyclohexylmethylene, , adamantaneethylene, − cholestanyl, , naphthyl, quinoxaline, oligomeric silsesquioxane, , and cationic phenyl group for controlling the molecular aggregation in the solid state. Among the various bulky PPVs, the polymers containing the cyclohexylmethylene and adamantaneethylene groups were reported to be very efficient in increasing the luminescence intensity by 4−5 times.…”

Section: Introductionmentioning

confidence: 99%

Control of π-Stacking for Highly Emissive Poly(p-phenylenevinylene)s: Synthesis and Photoluminescence of New Tricyclodecane Substituted Bulky Poly(p-phenylenevinylene)s and Its Copolymers

Amrutha

Jayakannan

2006

J. Phys. Chem. B

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In the present work, we have demonstrated a facile approach to increase the luminescence of the poly (p-phenylenevinylene)s via controlling the molecular aggregates induced by pi-stacking. We have synthesized new bulky tricyclodecane (TCD) substituted PPVs: poly(2-methoxy-5-tricyclodecanemethyleneoxy-1,4-phenylenevinylene) (MTCD-PPV), poly(bis-2,5-tricyclodecanemethyleneoxy-1,4-phenylenevinylene) (BTCD-PPV), and a series of symmetrically substituted bulky PPV copolymers (P-1-P-7) covering the entire composition range from 0 to 100 mol %. The structures of the monomers and polymers were confirmed by 1H NMR and FTIR, and the molecular weights were determined by gel permeation chromatography. The composition analysis by NMR revealed that the bulky monomer was highly reactive and the incorporation of bulky units in MEH-PPV increased irrespective of the feed ratio. The polymers possess good solubility, high molecular weights, good thermal stability, and so forth. The molecular weights of the PPV copolymers were also significantly affected by the bulky substitution: the higher the incorporation of bulky units, the lower the molecular weight. The absorption and emission studies revealed that there was no influence on the MEH-PPV by TCD substitution in solution whereas in the solid state the photoluminescence intensity of PPV increased more than 10 times. The luminescence increase in PPV was observed throughout the entire bulk and was not confined to any particular domain in the polymer. The bulky PPV copolymers showed that both the luminescence intensity (in film) and quantum yields (in solution) increased with an increase in the extent of BTCD incorporation in the MEH-PPV and attained a maximum for 50% BTCD. The TCD unit has thus proved to be an efficient bulky susbstituent for PPV as it controls the pi-stack-induced molecular aggregates in the polymer chains by increasing the interchain distances. The new bulky PPV copolymers are highly soluble, thermally stable, and highly luminescent besides being economically cheap compared to the other materials reported so far for the bulkier approach in pi-conjugated materials.

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Examination of EL and PL properties of MCHM-PPV and MEH-PPV: a study towards introduction of a new series of thin film EL devices

Cited by 17 publications

References 11 publications

High‐quality poly[2‐methoxy‐5‐(2′‐ethylhexyloxy)‐p‐phenylenevinylene] synthesized by a solid–liquid two‐phase reaction: Characterizations and electroluminescence properties

High‐quality poly[2‐methoxy‐5‐(2′‐ethylhexyloxy)‐p‐phenylenevinylene] synthesized by a solid–liquid two‐phase reaction: Characterizations and electroluminescence properties

The problem of detecting and managing depression in the rheumatology clinic

Control of π-Stacking for Highly Emissive Poly(p-phenylenevinylene)s: Synthesis and Photoluminescence of New Tricyclodecane Substituted Bulky Poly(p-phenylenevinylene)s and Its Copolymers

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