New host containing bipolar carrier transport moiety for high-efficiency electrophosphorescence at low voltages

Zhi Qiang Gao, Meiming Luo, Xiao Hua Sun, Hoi Lam TAM, Ricky M S WONG, Bao Xiu Mi, Ping Fang Xia, Kok Wai CHEAH, Chin Hsin Chen

Research output: Contribution to journalArticlepeer-review

138 Citations (Scopus)

Abstract

A new host containing bipolar carrier transport moiety for high-efficiency electro Phosphorescent Organic Light Emitting Devices (PHOLEDs) at low voltages was reported. The OLEDs were fabricated using a vacuum thermal evaporation chamber with a base pressure of 1.33 × 10-4 Pa. Two shadow masks were used to define the deposition areas for the organic and metal cathodes. Current-density-voltage-luminance properties and EL spectra of the device were measured. The ionization potential of the BUPH1 thin film was measured by UV photoemission spectroscopy. It was observed that the charge traps on the emitters and the hole-injection barrier between the hole transporting layer and the emitting layer are effectively reduced, due to narrow gap and desirable HOMO level of BUPH1. The important concept of integrating both hole-transporting and electron -transporting moieties into a host molecule has proven to be successful in PHOLED devices.

Original languageEnglish
Pages (from-to)688-692
Number of pages5
JournalAdvanced Materials
Volume21
Issue number6
DOIs
Publication statusPublished - 9 Feb 2009

Scopus Subject Areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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