Synthesis, characteristics of blue electroluminescent copolymers containing fluorene unit and aliphatic non-conjugated segments

Yuan, Zhuliang; Yu, Zongqiang; Tan, Songting

doi:10.1007/s10853-006-0607-5

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…2,2 -(3,4-Didodecyloxythiophene-2,5-diyl)bis[5-((4-triphenylphosphonion methyl) phenyl)-1,3,4-oxadiazole]dibromide (2) was synthesized according to the reported procedure 9 starting from thiodiglycolic acid. 4,4 -[Hexane-1,6-diylbis(oxy)]dibenzaldehyde (4) was synthesized following the procedure reported by Yuan et al 13 …”

Section: Methodsmentioning

confidence: 99%

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

Udayakumar

et al. 2016

J Chem Sci

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Abstract. In this communication, we report synthesis and characterization of new D-A conjugated polymers (P1-P3) consisting of electron-donating (D) 3,4-didodecyloxythiophene, electron-accepting (A) 1,3,4-oxadiazole unit and non-conjugation linkers. The conjugated segment in P1-P3 contains only five aromatic rings resulting in short conjugation length, but has an alternate D-A arrangement which significantly enhances the intramolecular charge transfer (ICT) interaction within the segment. As a result, these polymers exhibited low optical band gap in the range 2.51-2.76 eV. Fluorescence emission studies revealed that the polymer thin films emit intense blue light with emission maxima in the wavelength rage 430-480 nm. All three polymers undergo both oxidation and reduction processes under electrochemical conditions. Further, these polymers (P1-P3) exhibit low-lying HOMO and LUMO levels as a result of D-A structure of the conjugated segment. Polymer light-emitting devices were fabricated using these polymers as emissive layer with a device configuration of ITO/MoO 3 /polymer/LiF/Al. The test device based on P2 emitted blue light with a low threshold voltage of 5 V. Z-scan studies reveal that the polymers exhibit a strong optical limiting behavior. The value of the nonlinear absorption coefficient (β) of polymers is of the order 10 −11 m/W which indicates that these materials may be accomplished for fabricating optical limiters.

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Section: Methodsmentioning

confidence: 99%

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

Udayakumar

et al. 2016

J Chem Sci

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“…[1][2][3][4][5][6][7][8] They have been developed and applied due to remarkable advantages such as their self-emission, low operating voltage, color tunability, wide viewing angle, fast switching time, easy fabrication at low cost, and potential applications to full color flat panel displays and flexible displays. [9][10][11][12][13][14][15] Despite their many advantages, there are several issues that must be resolved, such as the device lifetime and luminescence.…”

Section: Introductionmentioning

confidence: 99%

“…PL spectra of copolymer I~VIII in CHCl3 . in the charge injection and transport process in LED devices.…”

mentioning

confidence: 99%

Synthesis and characterization of organic light-emitting copolymers containing naphthalene

et al. 2009

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Conjugated PPV-derived block copolymers containing 2-ethylhexyloxynaphthalene unit were synthesized and characterized in this study. The resulting polymers were soluble in common organic solvents and showed good thermal stabilities. The weight-average molecular weights (M w ) of the copolymers ranged from 246,000 to 475,000 with PDIs of 1.3~2.1. The optical properties of these polymers, measured both in a chloroform solution and on a film, showed a maximum absorption at 405~476 nm for Copolymers I~VIII. In the PL spectra, Copolymers I~VIII showed maximum peaks at 510~566 nm. The HOMOs, LUMOs and band gaps of the PPV derivatives of Copolymers I~VIII were 5.30~5.77, 3.04~3.24, and 2.5~2.2 eV, respectively. The multi-layered, light-emitting diodes of ITO/PEDOT/copolymers/LiF/Al exhibited turn-on voltages of 6~2.5 V. Copolymer VIII exhibited the maximum brightness of 3,657 cd/m 2 . Particularly, Copolymer VII, with an identical composition of MEH-PPV and naphthalene-PPV, showed a maximum luminance efficiency and power efficiency of 2.63 cd/A and 1.06 lm/W, respectively.

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Synthesis, characteristics of blue electroluminescent copolymers containing fluorene unit and aliphatic non-conjugated segments

Cited by 2 publications

References 12 publications

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

Synthesis and characterization of organic light-emitting copolymers containing naphthalene

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