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 journalArticlepeer-review


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
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

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


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