New class of light-emitting polymers/oligomers

Oh Kil Kim, Han Young Woo, Jai Kyeong Kim, Zhennian Huang

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Novel electro-/photoactive multifunctional dyes were synthesized based on dithienothiophene, DTT (π-center), linked by an electron D/D -or D/A pair segment; D-π-D (dye 1) or D-π-A (dye 2), to develop efficient bipolar light-emitting (LE) materials capable of balanced electron/hole capture in a single-layer LE device. A strong bipolarity manifested by electrochemical amphotericity was observed notably with dye 1, which cannot be accounted for without the involvement of the n-center, leading to the low HOMO/LUMO energy-gap and a small difference in the energy-gap between dye 1 and dye 2. Single-layer LE devices were fabricated by making a blend based on the dye (0.5 wt%), PVK (70%) as matrix and PBD (30%) as electron-transporting/hole blocking material, and by sandwiching between ITO and Al electrodes. PL intensity of the dyes by excitation at 440-450 nm (λmax) is much weaker compared to that at 340 nm (exciting mainly PVK), suggesting that the excitation of the dyes occur by energy-transfer from PVK. When compared PL intensities between the two dyes at a concentration <1%, dye 1 is slightly higher relative to dye 2. In contrast, the EL intensity shows an opposite trend in that dye 2 is much higher relative to dye 1 under the same condition. This implies that unlike the PL, the EL is not due to the transfer of the excited-energy from PVK but carrier trapping/exciton formation on the dye chromophore, and that dye 2 is strongly bipolar and thus more capable of balanced carrier capture.

Original languageEnglish
Pages (from-to)134-140
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3955
Publication statusPublished - 2000 Jan 1
Externally publishedYes
EventLiquid Crystal Materials, Devices and Flat Panel Displays - San Jose, CA, USA
Duration: 2000 Jan 272000 Jan 28

Fingerprint

Dyes
oligomers
Oligomers
Polymers
Coloring Agents
dyes
polymers
Electrons
Energy Gap
Energy gap
Class
Electron
bipolarity
Excitation
Chromophores
Energy transfer
Exciton
Energy Transfer
2-(2-(2-chloro-3-(2-(3,3-dimethyl-5-sulfo-1-(4-sulfo-butyl)-3H-indol-2-yl)-vinyl)-cyclohex-2-enylidene)-ethylidene)-3,3-dimethyl-1-(4-sulfo-butyl)-2,3-dihydro-1H-indole-5-carboxylic acid
ITO (semiconductors)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

New class of light-emitting polymers/oligomers. / Kim, Oh Kil; Woo, Han Young; Kim, Jai Kyeong; Huang, Zhennian.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3955, 01.01.2000, p. 134-140.

Research output: Contribution to journalConference article

@article{7db4d817e07048bcbcc5dced8deb44b0,
title = "New class of light-emitting polymers/oligomers",
abstract = "Novel electro-/photoactive multifunctional dyes were synthesized based on dithienothiophene, DTT (π-center), linked by an electron D/D -or D/A pair segment; D-π-D (dye 1) or D-π-A (dye 2), to develop efficient bipolar light-emitting (LE) materials capable of balanced electron/hole capture in a single-layer LE device. A strong bipolarity manifested by electrochemical amphotericity was observed notably with dye 1, which cannot be accounted for without the involvement of the n-center, leading to the low HOMO/LUMO energy-gap and a small difference in the energy-gap between dye 1 and dye 2. Single-layer LE devices were fabricated by making a blend based on the dye (0.5 wt{\%}), PVK (70{\%}) as matrix and PBD (30{\%}) as electron-transporting/hole blocking material, and by sandwiching between ITO and Al electrodes. PL intensity of the dyes by excitation at 440-450 nm (λmax) is much weaker compared to that at 340 nm (exciting mainly PVK), suggesting that the excitation of the dyes occur by energy-transfer from PVK. When compared PL intensities between the two dyes at a concentration <1{\%}, dye 1 is slightly higher relative to dye 2. In contrast, the EL intensity shows an opposite trend in that dye 2 is much higher relative to dye 1 under the same condition. This implies that unlike the PL, the EL is not due to the transfer of the excited-energy from PVK but carrier trapping/exciton formation on the dye chromophore, and that dye 2 is strongly bipolar and thus more capable of balanced carrier capture.",
author = "Kim, {Oh Kil} and Woo, {Han Young} and Kim, {Jai Kyeong} and Zhennian Huang",
year = "2000",
month = "1",
day = "1",
language = "English",
volume = "3955",
pages = "134--140",
journal = "Proceedings of SPIE - The International Society for Optical Engineering",
issn = "0277-786X",
publisher = "SPIE",

}

TY - JOUR

T1 - New class of light-emitting polymers/oligomers

AU - Kim, Oh Kil

AU - Woo, Han Young

AU - Kim, Jai Kyeong

AU - Huang, Zhennian

PY - 2000/1/1

Y1 - 2000/1/1

N2 - Novel electro-/photoactive multifunctional dyes were synthesized based on dithienothiophene, DTT (π-center), linked by an electron D/D -or D/A pair segment; D-π-D (dye 1) or D-π-A (dye 2), to develop efficient bipolar light-emitting (LE) materials capable of balanced electron/hole capture in a single-layer LE device. A strong bipolarity manifested by electrochemical amphotericity was observed notably with dye 1, which cannot be accounted for without the involvement of the n-center, leading to the low HOMO/LUMO energy-gap and a small difference in the energy-gap between dye 1 and dye 2. Single-layer LE devices were fabricated by making a blend based on the dye (0.5 wt%), PVK (70%) as matrix and PBD (30%) as electron-transporting/hole blocking material, and by sandwiching between ITO and Al electrodes. PL intensity of the dyes by excitation at 440-450 nm (λmax) is much weaker compared to that at 340 nm (exciting mainly PVK), suggesting that the excitation of the dyes occur by energy-transfer from PVK. When compared PL intensities between the two dyes at a concentration <1%, dye 1 is slightly higher relative to dye 2. In contrast, the EL intensity shows an opposite trend in that dye 2 is much higher relative to dye 1 under the same condition. This implies that unlike the PL, the EL is not due to the transfer of the excited-energy from PVK but carrier trapping/exciton formation on the dye chromophore, and that dye 2 is strongly bipolar and thus more capable of balanced carrier capture.

AB - Novel electro-/photoactive multifunctional dyes were synthesized based on dithienothiophene, DTT (π-center), linked by an electron D/D -or D/A pair segment; D-π-D (dye 1) or D-π-A (dye 2), to develop efficient bipolar light-emitting (LE) materials capable of balanced electron/hole capture in a single-layer LE device. A strong bipolarity manifested by electrochemical amphotericity was observed notably with dye 1, which cannot be accounted for without the involvement of the n-center, leading to the low HOMO/LUMO energy-gap and a small difference in the energy-gap between dye 1 and dye 2. Single-layer LE devices were fabricated by making a blend based on the dye (0.5 wt%), PVK (70%) as matrix and PBD (30%) as electron-transporting/hole blocking material, and by sandwiching between ITO and Al electrodes. PL intensity of the dyes by excitation at 440-450 nm (λmax) is much weaker compared to that at 340 nm (exciting mainly PVK), suggesting that the excitation of the dyes occur by energy-transfer from PVK. When compared PL intensities between the two dyes at a concentration <1%, dye 1 is slightly higher relative to dye 2. In contrast, the EL intensity shows an opposite trend in that dye 2 is much higher relative to dye 1 under the same condition. This implies that unlike the PL, the EL is not due to the transfer of the excited-energy from PVK but carrier trapping/exciton formation on the dye chromophore, and that dye 2 is strongly bipolar and thus more capable of balanced carrier capture.

UR - http://www.scopus.com/inward/record.url?scp=0033872477&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033872477&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0033872477

VL - 3955

SP - 134

EP - 140

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

ER -