Synthesis and characterization of indeno[1,2-6] fluorene-based white light-emitting copolymer

Eunjae Jeong, Sun Hee Kim, In Hwan Jung, Yangjun Xia, Kwanghee Lee, Hongsuk Suh, Hong Ku Shim, Han Young Woo

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

An indenofluorene-based copolymer containing blue-, green-, and red light-emitting moieties was synthesized by Suzuki polymerization and examined for application in white organic light-emitting diodes (WOLEDs). Tetraoctylindenofluor-ene (IF), 2,1,3-benzothiadiazole (BT), and 4,7-bis(2-thienyl)-2,1,3-benzothiadiazole (DBT) derivatives were used as the blue-, green-, and red-light emitting structures, respectively. The number-average molecular weight of the polymer was determined to be 25,900 g/mol with a polydispersity index of 2.02. The polymer was thermally stable (T d = ∼398 °C) and quite soluble in common organic solvents, forming an optical-quality film by spin casting. The EL characteristics were fine-tuned from the single copolymer through incomplete fluorescence energy transfer by adjusting" the composition of the red/green/blue units in the copolymer. The EL device using the indenofluorene-based copolymer containing 0.01 mol % BT and 0.02 mol % DBT units (PIF-BT01-DBT02) showed a maximum brightness of 4088 cd/m2 at 8 V and a maximum current efficiency of 0.36 cd/A with Commission Internationale de L'Eclair-age (CIE) coordinates of (0.34, 0.32). The EL emission of PIF-BT01-DBT02 was stable with respect to changes in voltage. The color emitted was dependent on the thickness of the active polymer layer; layer (∼60 nm) too thin was unsuitable for realizing WOLED via energy transfer.

Original languageEnglish
Pages (from-to)3467-3479
Number of pages13
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume47
Issue number14
DOIs
Publication statusPublished - 2009 Jul 15
Externally publishedYes

Fingerprint

Copolymers
Polymers
Organic light emitting diodes (OLED)
Energy transfer
Polydispersity
Organic solvents
Luminance
Casting
Fluorescence
Molecular weight
Polymerization
Color
Derivatives
fluorene
Electric potential
Chemical analysis
benzo-1,2,3-thiadiazole

Keywords

  • Conjugated polymers
  • Copolymerization
  • Light-emitting diodes (LED)

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Synthesis and characterization of indeno[1,2-6] fluorene-based white light-emitting copolymer. / Jeong, Eunjae; Kim, Sun Hee; Jung, In Hwan; Xia, Yangjun; Lee, Kwanghee; Suh, Hongsuk; Shim, Hong Ku; Woo, Han Young.

In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 47, No. 14, 15.07.2009, p. 3467-3479.

Research output: Contribution to journalArticle

Jeong, Eunjae ; Kim, Sun Hee ; Jung, In Hwan ; Xia, Yangjun ; Lee, Kwanghee ; Suh, Hongsuk ; Shim, Hong Ku ; Woo, Han Young. / Synthesis and characterization of indeno[1,2-6] fluorene-based white light-emitting copolymer. In: Journal of Polymer Science, Part A: Polymer Chemistry. 2009 ; Vol. 47, No. 14. pp. 3467-3479.
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AU - Jeong, Eunjae

AU - Kim, Sun Hee

AU - Jung, In Hwan

AU - Xia, Yangjun

AU - Lee, Kwanghee

AU - Suh, Hongsuk

AU - Shim, Hong Ku

AU - Woo, Han Young

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AB - An indenofluorene-based copolymer containing blue-, green-, and red light-emitting moieties was synthesized by Suzuki polymerization and examined for application in white organic light-emitting diodes (WOLEDs). Tetraoctylindenofluor-ene (IF), 2,1,3-benzothiadiazole (BT), and 4,7-bis(2-thienyl)-2,1,3-benzothiadiazole (DBT) derivatives were used as the blue-, green-, and red-light emitting structures, respectively. The number-average molecular weight of the polymer was determined to be 25,900 g/mol with a polydispersity index of 2.02. The polymer was thermally stable (T d = ∼398 °C) and quite soluble in common organic solvents, forming an optical-quality film by spin casting. The EL characteristics were fine-tuned from the single copolymer through incomplete fluorescence energy transfer by adjusting" the composition of the red/green/blue units in the copolymer. The EL device using the indenofluorene-based copolymer containing 0.01 mol % BT and 0.02 mol % DBT units (PIF-BT01-DBT02) showed a maximum brightness of 4088 cd/m2 at 8 V and a maximum current efficiency of 0.36 cd/A with Commission Internationale de L'Eclair-age (CIE) coordinates of (0.34, 0.32). The EL emission of PIF-BT01-DBT02 was stable with respect to changes in voltage. The color emitted was dependent on the thickness of the active polymer layer; layer (∼60 nm) too thin was unsuitable for realizing WOLED via energy transfer.

KW - Conjugated polymers

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