Characteristics in bilayer organic light-emitting diodes with variation of the film thickness

Kwang Jik Lee, Jae Woong Yu, Jai Kyeong Kim, Young Chul Kim, Jong Hyeok Park, O. Ok Park

Research output: Contribution to journalArticle

Abstract

We fabricated bilayer polymer light-emitting diodes (PLED) with Poly(9,9′-diyhexylfluorene-2, 7-divinylene-m-phenylenevinylene-stat-p-phenylenevinylene) (PDHFMPPV) and poly(N-vinylcarbazole) (PVK) as an emmitting layer and a hole transport layer, respectively. The thickness of each layer was varied, while the total thickness was controlled to be constant as 110nm. We observed electroluminescence, photoluminescence and current-voltage-luminescence characteristics of these bilayer devices and a single layer device with PDHFMPPV polymer as a light emitting layer for comparison. The quantum efficiencies of the bilayer devices were enhanced up to two about orders magnitude compared with the single-layer device.

Original languageEnglish
Pages (from-to)147-152
Number of pages6
JournalMolecular Crystals and Liquid Crystals
Volume424
DOIs
Publication statusPublished - 2004 Dec 1

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Organic light emitting diodes (OLED)
Film thickness
Polymers
film thickness
light emitting diodes
Electroluminescence
Quantum efficiency
Light emitting diodes
Luminescence
Photoluminescence
Electric potential
polymers
electroluminescence
quantum efficiency
luminescence
photoluminescence
electric potential
poly-N-vinylcarbazole
N,N'-dipyridoxylethylenediamine-N,N'-diacetic acid

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Lee, Kwang Jik ; Yu, Jae Woong ; Kim, Jai Kyeong ; Kim, Young Chul ; Park, Jong Hyeok ; Park, O. Ok. / Characteristics in bilayer organic light-emitting diodes with variation of the film thickness. In: Molecular Crystals and Liquid Crystals. 2004 ; Vol. 424. pp. 147-152.
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Characteristics in bilayer organic light-emitting diodes with variation of the film thickness. / Lee, Kwang Jik; Yu, Jae Woong; Kim, Jai Kyeong; Kim, Young Chul; Park, Jong Hyeok; Park, O. Ok.

In: Molecular Crystals and Liquid Crystals, Vol. 424, 01.12.2004, p. 147-152.

Research output: Contribution to journalArticle

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AU - Lee, Kwang Jik

AU - Yu, Jae Woong

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AU - Park, O. Ok

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AB - We fabricated bilayer polymer light-emitting diodes (PLED) with Poly(9,9′-diyhexylfluorene-2, 7-divinylene-m-phenylenevinylene-stat-p-phenylenevinylene) (PDHFMPPV) and poly(N-vinylcarbazole) (PVK) as an emmitting layer and a hole transport layer, respectively. The thickness of each layer was varied, while the total thickness was controlled to be constant as 110nm. We observed electroluminescence, photoluminescence and current-voltage-luminescence characteristics of these bilayer devices and a single layer device with PDHFMPPV polymer as a light emitting layer for comparison. The quantum efficiencies of the bilayer devices were enhanced up to two about orders magnitude compared with the single-layer device.

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