Improvement in polymer light-emitting diode performance using polymer heterojunction structure prepared by evaporative spray deposition from ultradilute solution

Masato Shakutsui, Katsuhiko Fujita, Tetsuo Tsutsui

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We successfully demonstrated a significant improvement in polymer light-emitting diode performance by employing a polymer bilayer structure prepared by evaporative spray deposition from ultradilute solution (ESDUS). The bilayer structure consisted of two π-conjugated polymers, where the top layer was deposited from tetrahydrofuran (THF) solution by ESDUS onto the preceding bottom layer composed of the other THF-soluble polymer. The external quantum efficiency (EQE) of the bilayer device is improved markedly in comparison with that of a corresponding single-layer device prepared by conventional spin-coating. Moreover, the EQE of the bilayer device tends to be constant throughout a wide current region, whereas that of single-layer devices increases gradually with current density. These observations indicate that carriers are effectively blocked at the polymer/polymer interface of the bilayer device.

Original languageEnglish
Pages (from-to)L790-L792
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume45
Issue number29-32
DOIs
Publication statusPublished - Aug 11 2006

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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