Copolymers containing pendant styryltriphenylamine and carbazole groups

Synthesis, optical, electrochemical properties and its blend with Ir(ppy)3

Chih Cheng Lee, Kun Ming Yeh, Yun Chen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A series of vinyl copolymers (PVKST12-PVKST91) and homoploymer PVST containing pendant hole-transporting 4-(4-oxystyryl)triphenylamine (12-100 mol%) and carbazole chromophores were synthesized by radical copolymerization and employed as host for Ir(ppy)3 phosphor to tune emission color. They were characterized using the 1H NMR, FT-IR, absorption and photoluminescence spectra, elemental analysis, GPC, cyclic voltammetric and thermal analysis (DSC, TGA). Their weight-average molecular weights (Mw) and decomposition temperatures (Td) were 1.46-5.68 × 104 and 356-399 °C, respectively. The HOMO levels of PVKST12-PVKST91 and PVST, estimated from the onset oxidation potentials in cyclic voltammograms, were -5.40 to -5.14 eV, which are much higher than -5.8 eV of the conventional host poly(9-vinylcarbazole) (PVK) owing to high hole-affinity of the 4-(4-oxystyryl)triphenylamine groups. Therefore, copolymers PVKST are effective in reducing hole-injection barrier between the PEDOT:PSS and emitting layer. Electroluminescent devices [ITO/PEDOT:PSS/PVKST:Ir(ppy)3:PBD/BCP/Ca/Al] using the hole-transporting PVKST as host were fabricated to tune the emission color. Their EL spectra showed a major emission at 515 nm and a minor peak at 435 nm attributed to Ir(ppy)3 and 4-(4-oxystyryl)triphenylamine, respectively. The C.I.E. 1931 coordinates shift from (0.29, 0.61) for PVK to (0.33, 0.42) for PVST with an increase in 4-(4-oxystyryl)triphenylamine content.

Original languageEnglish
Pages (from-to)410-417
Number of pages8
Journalpolymer
Volume50
Issue number2
DOIs
Publication statusPublished - 2009 Jan 16

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Electrochemical properties
Copolymers
Color
Luminescent devices
Chromophores
Phosphors
Copolymerization
Thermoanalysis
Photoluminescence
Molecular weight
Nuclear magnetic resonance
Decomposition
Oxidation
Chemical analysis
Temperature
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
carbazole

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics

Cite this

@article{62bb5579fde749188ef078adf1130bef,
title = "Copolymers containing pendant styryltriphenylamine and carbazole groups: Synthesis, optical, electrochemical properties and its blend with Ir(ppy)3",
abstract = "A series of vinyl copolymers (PVKST12-PVKST91) and homoploymer PVST containing pendant hole-transporting 4-(4-oxystyryl)triphenylamine (12-100 mol{\%}) and carbazole chromophores were synthesized by radical copolymerization and employed as host for Ir(ppy)3 phosphor to tune emission color. They were characterized using the 1H NMR, FT-IR, absorption and photoluminescence spectra, elemental analysis, GPC, cyclic voltammetric and thermal analysis (DSC, TGA). Their weight-average molecular weights (Mw) and decomposition temperatures (Td) were 1.46-5.68 × 104 and 356-399 °C, respectively. The HOMO levels of PVKST12-PVKST91 and PVST, estimated from the onset oxidation potentials in cyclic voltammograms, were -5.40 to -5.14 eV, which are much higher than -5.8 eV of the conventional host poly(9-vinylcarbazole) (PVK) owing to high hole-affinity of the 4-(4-oxystyryl)triphenylamine groups. Therefore, copolymers PVKST are effective in reducing hole-injection barrier between the PEDOT:PSS and emitting layer. Electroluminescent devices [ITO/PEDOT:PSS/PVKST:Ir(ppy)3:PBD/BCP/Ca/Al] using the hole-transporting PVKST as host were fabricated to tune the emission color. Their EL spectra showed a major emission at 515 nm and a minor peak at 435 nm attributed to Ir(ppy)3 and 4-(4-oxystyryl)triphenylamine, respectively. The C.I.E. 1931 coordinates shift from (0.29, 0.61) for PVK to (0.33, 0.42) for PVST with an increase in 4-(4-oxystyryl)triphenylamine content.",
author = "Lee, {Chih Cheng} and Yeh, {Kun Ming} and Yun Chen",
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Copolymers containing pendant styryltriphenylamine and carbazole groups : Synthesis, optical, electrochemical properties and its blend with Ir(ppy)3. / Lee, Chih Cheng; Yeh, Kun Ming; Chen, Yun.

In: polymer, Vol. 50, No. 2, 16.01.2009, p. 410-417.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Copolymers containing pendant styryltriphenylamine and carbazole groups

T2 - Synthesis, optical, electrochemical properties and its blend with Ir(ppy)3

AU - Lee, Chih Cheng

AU - Yeh, Kun Ming

AU - Chen, Yun

PY - 2009/1/16

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N2 - A series of vinyl copolymers (PVKST12-PVKST91) and homoploymer PVST containing pendant hole-transporting 4-(4-oxystyryl)triphenylamine (12-100 mol%) and carbazole chromophores were synthesized by radical copolymerization and employed as host for Ir(ppy)3 phosphor to tune emission color. They were characterized using the 1H NMR, FT-IR, absorption and photoluminescence spectra, elemental analysis, GPC, cyclic voltammetric and thermal analysis (DSC, TGA). Their weight-average molecular weights (Mw) and decomposition temperatures (Td) were 1.46-5.68 × 104 and 356-399 °C, respectively. The HOMO levels of PVKST12-PVKST91 and PVST, estimated from the onset oxidation potentials in cyclic voltammograms, were -5.40 to -5.14 eV, which are much higher than -5.8 eV of the conventional host poly(9-vinylcarbazole) (PVK) owing to high hole-affinity of the 4-(4-oxystyryl)triphenylamine groups. Therefore, copolymers PVKST are effective in reducing hole-injection barrier between the PEDOT:PSS and emitting layer. Electroluminescent devices [ITO/PEDOT:PSS/PVKST:Ir(ppy)3:PBD/BCP/Ca/Al] using the hole-transporting PVKST as host were fabricated to tune the emission color. Their EL spectra showed a major emission at 515 nm and a minor peak at 435 nm attributed to Ir(ppy)3 and 4-(4-oxystyryl)triphenylamine, respectively. The C.I.E. 1931 coordinates shift from (0.29, 0.61) for PVK to (0.33, 0.42) for PVST with an increase in 4-(4-oxystyryl)triphenylamine content.

AB - A series of vinyl copolymers (PVKST12-PVKST91) and homoploymer PVST containing pendant hole-transporting 4-(4-oxystyryl)triphenylamine (12-100 mol%) and carbazole chromophores were synthesized by radical copolymerization and employed as host for Ir(ppy)3 phosphor to tune emission color. They were characterized using the 1H NMR, FT-IR, absorption and photoluminescence spectra, elemental analysis, GPC, cyclic voltammetric and thermal analysis (DSC, TGA). Their weight-average molecular weights (Mw) and decomposition temperatures (Td) were 1.46-5.68 × 104 and 356-399 °C, respectively. The HOMO levels of PVKST12-PVKST91 and PVST, estimated from the onset oxidation potentials in cyclic voltammograms, were -5.40 to -5.14 eV, which are much higher than -5.8 eV of the conventional host poly(9-vinylcarbazole) (PVK) owing to high hole-affinity of the 4-(4-oxystyryl)triphenylamine groups. Therefore, copolymers PVKST are effective in reducing hole-injection barrier between the PEDOT:PSS and emitting layer. Electroluminescent devices [ITO/PEDOT:PSS/PVKST:Ir(ppy)3:PBD/BCP/Ca/Al] using the hole-transporting PVKST as host were fabricated to tune the emission color. Their EL spectra showed a major emission at 515 nm and a minor peak at 435 nm attributed to Ir(ppy)3 and 4-(4-oxystyryl)triphenylamine, respectively. The C.I.E. 1931 coordinates shift from (0.29, 0.61) for PVK to (0.33, 0.42) for PVST with an increase in 4-(4-oxystyryl)triphenylamine content.

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