Analyzing bipolar carrier transport characteristics of diarylamino- substituted heterocyclic compounds in organic light-emitting diodes by probing electroluminescence spectra

Kyung Soo Son, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki, Chihaya Adachi

研究成果: Contribution to journalArticle査読

65 被引用数 (Scopus)

抄録

We analyzed bipolar carrier transport characteristics of diarylamino-substituted heterocyclic compounds (DAHCs) having benzene, pyridine, pyrimidine, or triazine electron-accepting core units and carbazole or β-naphthylamine as electron-donating substituents. The highest occupied molecular and lowest unoccupied molecular orbital levels, carrier injection, and transport characteristics were systematically controlled by changing combinations of the core and substituent units. By analyzing electroluminescence spectra as a probe in four kinds of organic light emitting diode (OLED) structures, we found that the carrier transport characteristics of DAHCs significantly change depending on device structure. We concluded that all DAHCs have bipolar carrier transport characteristics, that is, DAHCs intrinsically possess both hole and electron mobilities that are based on unique molecular structures having both electron-donating and -accepting units. We also demonstrated that carrier injection barriers between DAHCs and adjacent carrier transport layers virtually control the appearance of bipolar characteristics in OLEDs.

本文言語英語
ページ(範囲)4439-4446
ページ数8
ジャーナルChemistry of Materials
20
13
DOI
出版ステータス出版済み - 7 8 2008

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学

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