Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5-b]pyridin-2-ylidene-Based Iridium(III) Phosphors

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

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Author(s)

  • Xilin Yang
  • Xiuwen Zhou
  • Ye-Xin Zhang
  • Deli Li
  • Chensen Li
  • Caifa You
  • Tai-Che Chou
  • Shi-Jian Su
  • Pi-Tai Chou

Detail(s)

Original languageEnglish
Article number2201150
Journal / PublicationAdvanced Science
Volume9
Issue number25
Online published13 Jul 2022
Publication statusPublished - 5 Sep 2022

Link(s)

Abstract

Four isomeric, homoleptic iridium(III) metal complexes bearing 5-(trifluoromethyl)imidazo[4,5-b]pyridin-2-ylidene and 6-(trifluoromethyl)imidazo[4,5-b]pyridin-2-ylidene-based cyclometalating chelates are successfully synthesized. The meridional isomers can be converted to facial isomers through acid induced isomerization. The m-isomers display a relatively broadened and red-shifted emission, while ƒ-isomers exhibit narrowed blue emission band, together with higher photoluminescent quantum yields and reduced radiative lifetime relative to the mer-counterparts. Maximum external quantum efficiencies of 13.5% and 22.8% are achieved for the electrophosphorescent devices based on ƒ-tpb1 and m-tpb1 as dopant emitter together with CIE coordinates of (0.15, 0.23) and (0.22, 0.45), respectively. By using ƒ-tpb1 as the sensitizing phosphor and t-DABNA as thermally activated delayed fluorescence (TADF) terminal emitter, hyperluminescent OLEDs are successfully fabricated, giving high efficiency of 29.6%, full width at half maximum (FWHM) of 30 nm, and CIE coordinates of (0.13, 0.11), confirming the efficient Förster resonance energy transfer (FRET) process.

Research Area(s)

  • carbene, cyclometalate, hyperphosphorescence, iridium, organic light-emitting diode

Citation Format(s)

Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5-b]pyridin-2-ylidene-Based Iridium(III) Phosphors. / Yang, Xilin; Zhou, Xiuwen; Zhang, Ye-Xin; Li, Deli; Li, Chensen; You, Caifa; Chou, Tai-Che; Su, Shi-Jian; Chou, Pi-Tai; Chi, Yun.

In: Advanced Science, Vol. 9, No. 25, 2201150, 05.09.2022.

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

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