All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)2(acac)]

Wentao Li, Yani He, Tiezheng Miao, Xingqiang LuÌ (Corresponding Author), Guorui Fu (Corresponding Author), Wai Yeung Wong (Corresponding Author), Hongshan He (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

All-solution-processed multilayered white polymer light-emitting diodes (WPLEDs) are promising candidates for low-cost and large-area flexible full-color flat-panel displays and solid-state lighting. However, it is still challenging to improve their performance. In this work, based on an elegant strategy of orthogonal materials, the utilization of the cross-linked Ir3+ polymer film poly(NVK-co-[Ir(4-vb-PBI)2(acac)]-co-NVK) (NVK = N-vinyl-carbazole; 4-vb-HPBI = 1-(4-vinylbenzyl)-2-phenyl-1H-benzo[d]imidazole; and Hacac = acetylacetone) as the emitting layer (EML) between a hydrophilic polymer film poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the hole injection layer (HIL) and a hydrophobic polymer film poly(vinyl-PBD) (vinyl-PBD = 2-(4-(tert-butyl)phenyl)-5-(4′-vinyl-[1,1′-biphenyl]-4-yl)-2,5-dihydro-1,3,4-oxadiazole) as the electron transport layer (ETL) led to the successful fabrication of reliable all-solution-processed multilayered WPLEDs. The device exhibits a ΕCEMax of 18.19 cd/A, a ΕPEMax of 8.16 lm/W, and a ΕEQEMax of 9.32% with stable white light (Commission International De L'Eclairage (CIE) coordinates x = 0.269-0.283, y = 0.317-0.330; corrected color temperatures (CCTs) of 7237-8199 K, and CRIs (color rendering indices) of 63-72) under a wide applied-voltage range. Its high performance, especially with record efficiencies among those of reported all-solution-processed WPLEDs, renders cross-linked Ir3+ polymers a new platform to all-solution-processed multilayered WPLEDs.

Original languageEnglish
Pages (from-to)11096-11107
Number of pages12
JournalACS Applied Materials and Interfaces
Volume13
Issue number9
DOIs
Publication statusPublished - 10 Mar 2021

Keywords

  • all-solution processing
  • cross-linked Ir3+ polymer
  • divinyl-modified [Ir(CâN)2(OâO)]-heteroleptic Ir(III) complex
  • multilayer
  • orthogonal materials
  • WPLED

ASJC Scopus subject areas

  • Materials Science(all)

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