Host copolymers containing pendant carbazole and oxadiazole groups: Synthesis, characterization and optoelectronic applications for efficient green phosphorescent OLEDs

Kun Ming Yeh, Chih Cheng Lee, Yun Chen

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Vinyl copolymers (PCOn), containing pendant carbazole and aromatic 1,3,4-oxadiazole attached with dodecyloxy group, were prepared from their corresponding precursor poly(9-vinyl carbazole-co-4-vinylbenzyl chloride) (PCBn) by the Williamson condensation (n: mole% of 4-vinylbenzyl chloride). These copolymers were used as host materials for green phosphorescent light-emitting diodes after blending 4 wt % of Ir(ppy)3. PL spectra of the PCOn films showed the formation of excimer or exciplex. The phosphorescent EL devices were fabricated with a configuration of ITO/PEDOT:PSS/host copolymers:Ir(ppy) 3/BCP/Ca/Al. The PL and EL spectra of the blends [PCOn:Ir(ppy) 3] revealed dominant green emission at 517 nm attributed to Ir(ppy)3 due to efficient energy transfer from the host to Ir(ppy)3. Efficient green phosphorescent OLEDs was obtained when employing copolymer PCO16 as the host and Ir(ppy)s as the guest. The maximal luminance efficiency and the maximal luminance of this device were 17.9 cd/A and 19,903 cd/m2, respectively. After doped with Ir(ppy) 3, the morphology of the films, both controlled PCP20 and PCO20 with attached dodecyloxy groups, were investigated by tapping-mode AFM and FE-SEM. The film of PCO20 exhibited uniform, featureless image and showed much better device performance than PCP20, which have been attributed to good compatibility of PCO20 with Ir(ppy)3.

Original languageEnglish
Pages (from-to)5180-5193
Number of pages14
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume46
Issue number15
DOIs
Publication statusPublished - 2008 Aug 1

Fingerprint

Oxadiazoles
Organic light emitting diodes (OLED)
Optoelectronic devices
Copolymers
Chlorides
Luminance
Energy transfer
Light emitting diodes
Condensation
Scanning electron microscopy
carbazole

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

@article{09890188c39c425abad50a84f669018a,
title = "Host copolymers containing pendant carbazole and oxadiazole groups: Synthesis, characterization and optoelectronic applications for efficient green phosphorescent OLEDs",
abstract = "Vinyl copolymers (PCOn), containing pendant carbazole and aromatic 1,3,4-oxadiazole attached with dodecyloxy group, were prepared from their corresponding precursor poly(9-vinyl carbazole-co-4-vinylbenzyl chloride) (PCBn) by the Williamson condensation (n: mole{\%} of 4-vinylbenzyl chloride). These copolymers were used as host materials for green phosphorescent light-emitting diodes after blending 4 wt {\%} of Ir(ppy)3. PL spectra of the PCOn films showed the formation of excimer or exciplex. The phosphorescent EL devices were fabricated with a configuration of ITO/PEDOT:PSS/host copolymers:Ir(ppy) 3/BCP/Ca/Al. The PL and EL spectra of the blends [PCOn:Ir(ppy) 3] revealed dominant green emission at 517 nm attributed to Ir(ppy)3 due to efficient energy transfer from the host to Ir(ppy)3. Efficient green phosphorescent OLEDs was obtained when employing copolymer PCO16 as the host and Ir(ppy)s as the guest. The maximal luminance efficiency and the maximal luminance of this device were 17.9 cd/A and 19,903 cd/m2, respectively. After doped with Ir(ppy) 3, the morphology of the films, both controlled PCP20 and PCO20 with attached dodecyloxy groups, were investigated by tapping-mode AFM and FE-SEM. The film of PCO20 exhibited uniform, featureless image and showed much better device performance than PCP20, which have been attributed to good compatibility of PCO20 with Ir(ppy)3.",
author = "Yeh, {Kun Ming} and Lee, {Chih Cheng} and Yun Chen",
year = "2008",
month = "8",
day = "1",
doi = "10.1002/pola.22846",
language = "English",
volume = "46",
pages = "5180--5193",
journal = "Journal of Polymer Science, Part A: Polymer Chemistry",
issn = "0887-624X",
publisher = "John Wiley and Sons Inc.",
number = "15",

}

TY - JOUR

T1 - Host copolymers containing pendant carbazole and oxadiazole groups

T2 - Synthesis, characterization and optoelectronic applications for efficient green phosphorescent OLEDs

AU - Yeh, Kun Ming

AU - Lee, Chih Cheng

AU - Chen, Yun

PY - 2008/8/1

Y1 - 2008/8/1

N2 - Vinyl copolymers (PCOn), containing pendant carbazole and aromatic 1,3,4-oxadiazole attached with dodecyloxy group, were prepared from their corresponding precursor poly(9-vinyl carbazole-co-4-vinylbenzyl chloride) (PCBn) by the Williamson condensation (n: mole% of 4-vinylbenzyl chloride). These copolymers were used as host materials for green phosphorescent light-emitting diodes after blending 4 wt % of Ir(ppy)3. PL spectra of the PCOn films showed the formation of excimer or exciplex. The phosphorescent EL devices were fabricated with a configuration of ITO/PEDOT:PSS/host copolymers:Ir(ppy) 3/BCP/Ca/Al. The PL and EL spectra of the blends [PCOn:Ir(ppy) 3] revealed dominant green emission at 517 nm attributed to Ir(ppy)3 due to efficient energy transfer from the host to Ir(ppy)3. Efficient green phosphorescent OLEDs was obtained when employing copolymer PCO16 as the host and Ir(ppy)s as the guest. The maximal luminance efficiency and the maximal luminance of this device were 17.9 cd/A and 19,903 cd/m2, respectively. After doped with Ir(ppy) 3, the morphology of the films, both controlled PCP20 and PCO20 with attached dodecyloxy groups, were investigated by tapping-mode AFM and FE-SEM. The film of PCO20 exhibited uniform, featureless image and showed much better device performance than PCP20, which have been attributed to good compatibility of PCO20 with Ir(ppy)3.

AB - Vinyl copolymers (PCOn), containing pendant carbazole and aromatic 1,3,4-oxadiazole attached with dodecyloxy group, were prepared from their corresponding precursor poly(9-vinyl carbazole-co-4-vinylbenzyl chloride) (PCBn) by the Williamson condensation (n: mole% of 4-vinylbenzyl chloride). These copolymers were used as host materials for green phosphorescent light-emitting diodes after blending 4 wt % of Ir(ppy)3. PL spectra of the PCOn films showed the formation of excimer or exciplex. The phosphorescent EL devices were fabricated with a configuration of ITO/PEDOT:PSS/host copolymers:Ir(ppy) 3/BCP/Ca/Al. The PL and EL spectra of the blends [PCOn:Ir(ppy) 3] revealed dominant green emission at 517 nm attributed to Ir(ppy)3 due to efficient energy transfer from the host to Ir(ppy)3. Efficient green phosphorescent OLEDs was obtained when employing copolymer PCO16 as the host and Ir(ppy)s as the guest. The maximal luminance efficiency and the maximal luminance of this device were 17.9 cd/A and 19,903 cd/m2, respectively. After doped with Ir(ppy) 3, the morphology of the films, both controlled PCP20 and PCO20 with attached dodecyloxy groups, were investigated by tapping-mode AFM and FE-SEM. The film of PCO20 exhibited uniform, featureless image and showed much better device performance than PCP20, which have been attributed to good compatibility of PCO20 with Ir(ppy)3.

UR - http://www.scopus.com/inward/record.url?scp=47549102424&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=47549102424&partnerID=8YFLogxK

U2 - 10.1002/pola.22846

DO - 10.1002/pola.22846

M3 - Article

AN - SCOPUS:47549102424

VL - 46

SP - 5180

EP - 5193

JO - Journal of Polymer Science, Part A: Polymer Chemistry

JF - Journal of Polymer Science, Part A: Polymer Chemistry

SN - 0887-624X

IS - 15

ER -