Revealing the role of 1,2,4-triazolate fragment of blue-emitting bis-tridentate Ir(III) phosphors : photophysical properties, photo-stabilities, and applications

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

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Author(s)

  • L.-Y. Hsu
  • W.-S. Tai
  • S.-F. Ni

Detail(s)

Original languageEnglish
Article number100636
Journal / PublicationMaterials Today Energy
Volume20
Online published5 Jan 2021
Publication statusPublished - Jun 2021

Abstract

Novel bis-tridentate Ir(III) complexes are of great interest in the development of blue-emitting organic light-emitting diodes (OLEDs) due to their rigid and robust molecular architecture. In this work, both the functional 6-pyrazolyl-2-phenoxypyridine (pzyPx) and 6-(1,2,4-triazolyl)-2-phenoxypyridine (tazPx) were used as chromophoric chelates in the construction of the blue-emitting Ir(III) phosphors. Accordingly, the substitution of pzyPx with tazPx chelates retains the desired characteristics, i.e. both high quantum yields (>92%) in solution and shortened radiative lifetime (τrad) (from 19.8 to 2.5 μs), respectively. The theoretical calculation reveals that the triazolate moiety contributes considerably to the radiative transition, to which the greater iridium involvement in T1 → S0 transition of tazPx-based complex is responsible for the shortened τrad. Consequently, enhanced photostabilities in degassed toluene and competitive performances with maximum EQE of 19.2% with CIE coordinates of (0.17, 0.22) were observed from the tazPx-based complex Px-33.

Research Area(s)

  • Blue complex, Iridium, OLEDs, Photostability, Radiative lifetime

Citation Format(s)

Revealing the role of 1,2,4-triazolate fragment of blue-emitting bis-tridentate Ir(III) phosphors : photophysical properties, photo-stabilities, and applications. / Zhu, Z.-L.; Hsu, L.-Y.; Tai, W.-S. et al.

In: Materials Today Energy, Vol. 20, 100636, 06.2021.

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