Bis-Tridentate Iridium(III) Phosphors with Very High Photostability and Fabrication of Blue-Emitting OLEDs

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Hsin-Hung Kuo
  • Yi-Kuang Chen
  • Shih-Hung Liu
  • Pi-Tai Chou

Detail(s)

Original languageEnglish
Article number1800846
Journal / PublicationAdvanced Science
Volume5
Issue number9
Online published31 Jul 2018
Publication statusPublished - Sep 2018

Link(s)

Abstract

Sky-blue and blue-emitting, carbazolyl functionalized, bis-tridentate Ir(III) phosphors Cz-1-Cz-3 with bright emission and short radiative lifetime are successfully synthesized in a one-pot manner. They exhibit very high photostability against UV-vis irradiation in degassed toluene, versus both green and true-blue-emitting reference compounds, i.e., fac-[Ir(ppy)3] and mer-[Ir(pmp)3]. Organic light-emitting diodes (OLEDs) based on Cz-2 exhibit maximum external quantum efficiency (EQE) of 21.6%, EQE of 15.1% at 100 cd m-2, and with CIEx, y  coordinates of (0.17, 0.25). This study provides a conceptual solution to the exceedingly stable and efficient blue phosphor. It is promising that long lifespan blue OLED based on these emitters can be attained with further engineering of devices suitable for commercial application.

Research Area(s)

  • Bis-tridentate, Carbazole, Iridium, N-heterocyclic carbene (NHC), Pyrazolate

Citation Format(s)

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