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Highly Luminescent Phosphine Oxide-Containing Bipolar Alkynylgold(iii) Complexes for Solution-Processable Organic Light-Emitting Devices With Small Efficiency Roll-Offs

Highly Luminescent Phosphine Oxide-Containing Bipolar Alkynylgold(iii) Complexes for Solution-Processable Organic Light-Emitting Devices With Small Efficiency Roll-Offs

Chin-Ho Lee, Man-Chung Tang, Wai-Lung Cheung, Shiu-Lun Lai, Mei-Yee Chan, Vivian Wing-Wah Yam

Chem Sci. 2018 Jun 28;9(29):6228-6232.

PMID: 30090310

Abstract:

We report the synthesis of alkynylgold(iii) complexes with an electron-transporting phosphine oxide moiety in the tridentate ligand and hole-transporting triarylamine moieties as auxiliary ligands to generate a new class of phosphine oxide-containing bipolar gold(iii) complexes for the first time. Such gold(iii) complexes feature high photoluminescence quantum yields of over 70% in 1,3-bis(N-carbazolyl)benzene thin films with relatively short excited-state lifetimes of less than 3.9 μs at a 20 wt% dopant concentration. Highly efficient solution-processable organic light-emitting devices have been prepared with superior current efficiencies of up to 51.6 cd A-1 and external quantum efficiencies of up to 15.3%. Notably, triplet-triplet annihilation has been significantly reduced, as exemplified by a very small efficiency roll-off of ∼1% at a practical brightness of 500 cd m-2.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP550378784	1,3-Bis(N-carbazolyl)benzene		550378-78-4	Price

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