Light-Emitting Electrochemical Cell (LEC) Using Polythiophene Derivative

Han, Eun‐Mi; Gu, Hal-Bon; Jin, Sung‐Ho; Lee, Seok-Hee; Moon, Seong-Bae; Kim, Woo-Hong; Lee, Kwang-Sik

doi:10.1080/10587250008024963

Cited by 6 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous work, we synthesized various types of novel PPV derivatives, which showed high-performance polymer LED as well as controlling emission color of the polymers. − In the present article, we report the synthesis and characterization of a new poly(9,9-di- n -octylfluorenyl-2,7-vinylene) poly(FV) and its copolymers with various feed ratios of MEH−PPV units synthesized by the Gilch polymerization method. This new poly(FV) and its copolymers have a high molecular weight, high thermal stability, and applicability for LEDs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electroluminescence Properties of Poly(9,9-di-n-octylfluorenyl-2,7-vinylene) Derivatives for Light-Emitting Display

Jin¹,

Kang²,

Kim³

et al. 2003

Macromolecules

Self Cite

View full text Add to dashboard Cite

9,9-Dialkylfluorenevinylene-based electroluminescence (EL) polymers, poly(9,9-di-n-octylfluorenyl-2,7-vinylene) poly(FV) and poly[(9,9-di-n-octylfluorenyl-2,7-vinylene)-co-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene}] poly(FV-co-MEHPV), have been synthesized by the Gilch polymerization method. The structure and properties of those polymers were characterized using 1H, 13C NMR, UV−vis spectroscopy, elemental analysis, GPC, DSC, TGA, photoluminescence (PL), and EL spectroscopy. The 9,9-dialkylfluorenevinylene-based EL polymers were soluble in common organic solvents and easily spin-coated onto the indium−tin oxide (ITO)-coated glass substrates. The weight-average molecular weight (M w) and polydispersity of poly(FV) and poly(FV-co-MEHPV) were in the range (22.2−43.2) × 104 and 1.9−3.0, respectively. Double-layer light-emitting displays (LEDs) with an ITO/PEDOT/polymer/Al configuration were fabricated, and the devices using poly(FV-co-MEHPV) showed better EL properties than those using pure poly(FV) or MEH−PPV. The emission maxima of poly(FV) and poly(FV-co-MEHPV), with various feed ratios of MEH−PPV contents, were observed at 507 and 585 nm, respectively, regardless of copolymer compositions. This phenomenon can be explained by energy transfer from poly(FV) segments with wide band gap to MEH−PPV blocks with smaller band gap in these copolymer systems. The turn-on voltages of poly(FV) and its copolymers dramatically decreased to 2.5 V as compared with those for poly(9,9-dialkylfluorene)s (PF)s. Maximum brightness and luminescence efficiencies were increased up to 1350 cd/m2 and 0.51 cd/A, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Electroluminescence Properties of Poly(9,9-di-n-octylfluorenyl-2,7-vinylene) Derivatives for Light-Emitting Display

Jin¹,

Kang²,

Kim³

et al. 2003

Macromolecules

Self Cite

View full text Add to dashboard Cite

show abstract

“…These materials have been synthesized by precursor routes or the dehydrohalogenation method, leading to soluble and high molecular weight polymers. In our previous works, we have synthesized various types of novel EL polymers and blending systems with an electron transport polymer containing an oxadiazole repeating unit to improve the efficiency as well as to control the color tuning of the polymers. − The EL properties of the blending system were improved as compared to the EL polymer itself.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Highly Luminescent Asymmetric Poly(p-phenylene vinylene) Derivatives for Light-Emitting Diodes

et al. 2002

Self Cite

View full text Add to dashboard Cite

Asymmetric and color tunable poly(p-phenylene vinylene) (PPV) derivatives with a dimethyldodecylsilylphenyl pendant group, poly[2-(3‘-dimethyldodecylsilylphenyl)-1,4-phenylene vinylene] (m-SiPhPPV) and poly[2-(3‘-dimethyldodecylsilylphenyl)-1,4-phenylene vinylene-co-2-methoxy-5-(2‘-ethylhexyl oxy)-1,4-phenylene vinylene] (m-SiPhPPV-co-MEH−PPV), have been synthesized by a dehydrohalogenation method. Newly synthesized, these homo- and copolymers are highly soluble in common organic solvents. The defect-free uniformly thin films easily formed onto the indium tin oxide (ITO) coated glass substrate. The resulting polymers had high molecular weights with narrow polydispersities and high thermal stability up to 400 °C. The copolymers showed better optical and electroluminescent (EL) properties than those of the homopolymer. Single-layer light-emitting devices with an ITO/polymer/Al:Li alloy configuration were fabricated by using the resulting polymers. The maximum EL emissions of m-SiPhPPV and m-SiPhPPV-co-MEHPPV with various monomer feed ratios were observed at 528 and 588−595 nm, respectively. The emission color of the resulting polymers changed from green to orange. The EL properties of the m-SiPhPPV-co-MEH−PPV dramatically improved compared to those of m-SiPhPPV and MEH−PPV. The maximum brightness and the external luminance efficiency of the m-SiPhPPV-co-MEH−PPV were up to 19 180 cd/m2 and 2.9 lm/W. The half lifetime of a single-layer device at 1000 cd/m2 is about 120 h.

show abstract

“…In our continuing attempts to improve the device performance of PLEDs, we have reported novel EL polymers such as alkylsilylphenyl- and alkyloxyphenoxy-substituted PPVs, the blending of systems with oxadiazole-containing electron transfer polymers, and the synthesis of alternating copolymers composed of PPV segments and aromatic amine blocks. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Poly(fluorene-alt-cyanophenylenevinylene)-Based Alternating Copolymers for Light-Emitting Diodes

Jin¹,

Kim²,

Kim³

et al. 2004

Chem. Mater.

Self Cite

View full text Add to dashboard Cite

The novel statistical alternating EL copolymers poly[bis{2-(4-phenylenevinylene)-2-cyanoethenyl}-9,9-dihexyl-9H-fluorene-2,7-yl-alt-1,4-phenylene vinylene] (polymer I), poly-[bis{2-(4-phenylenevinylene)-2-cyanoethenyl}-9,9-dihexyl-9H-fluorene-2,7-yl-alt-2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (polymer II), and poly[bis{2-(4-phenylenevinylene)-2-cyanoethenyl}-9,9-dihexyl-9H-fluorene-2,7-yl-alt-1,4-biphenylenevinylene] (polymer III) were synthesized using modified Heck coupling reactions, and their EL characteristics were investigated. These fluorene-and cyanophenylenevinylene-based alternating copolymers, which have strong electron-withdrawing CN groups on their vinylene units, were found to be completely soluble in common organic solvents and easily spin-coated onto indium-tin oxide (ITO) coated glass substrates. The HOMO and LUMO energy levels and the electrooptical properties of these copolymers can be tuned by varying the main-chain structures and the side-chain groups. These well-defined conjugated copolymers can be synthesized with or without dialkyloxy substituents on the phenylenevinylene or biphenylenevinylene units instead of the phenylenevinylene unit; these variations in composition give rise to different emission maxima, ranging from bright yellow to a yellowish-orange color. A double-layer polymer light-emitting diode (PLED) with an ITO/PEDOT/polymer II/Al configuration exhibited a maximum brightness and luminescence efficiency of 7500 cd/m 2 at 20 V and 0.21 lm/W at 6.7 V, respectively.

show abstract

Light-Emitting Electrochemical Cell (LEC) Using Polythiophene Derivative

Cited by 6 publications

References 4 publications

Synthesis and Electroluminescence Properties of Poly(9,9-di-n-octylfluorenyl-2,7-vinylene) Derivatives for Light-Emitting Display

Synthesis and Electroluminescence Properties of Poly(9,9-di-n-octylfluorenyl-2,7-vinylene) Derivatives for Light-Emitting Display

Synthesis and Characterization of Highly Luminescent Asymmetric Poly(p-phenylene vinylene) Derivatives for Light-Emitting Diodes

Synthesis and Properties of Poly(fluorene-alt-cyanophenylenevinylene)-Based Alternating Copolymers for Light-Emitting Diodes

Contact Info

Product

Resources

About