Efficient white polymer light-emitting diodes (WPLEDs) based on double emitting layers of a PVK:Eu(iii)-complex and Alq3

Yani He, Lin Liu, Guorui Fu, Wentao Li, Xingqiang Lü, Hongshan He, Wai Yeung Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Colour-tunable polymer light-emitting diodes (PLEDs) were realized by tuning the concentration of an Eu3+-complex in the emitting-layer (EML) and the thickness of the hole-blocking BCP layer (BCP = 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline) in a double-emitting-layer (dEML) configuration. The dEML used PVK:complex 2 (PVK = poly(N-vinylcarbazole); H2Salen = N,N′-bis(salicylidene)cyclohexane-1,2-diamine and HDBM = dibenzoylmethane for [Zn(Salen)(μ-OAc)Eu(DBM)2] (2)) as EML1 and Alq3 as EML2. The efficiencies (0.32-0.39 cd A-1, 0.54-0.56% and 0.99-1.10 lm W-1) were obtained from organo-Eu3+ incorporated WPLEDs with a complex-2-doping content of 20 or 30 wt% and 20 nm BCP thickness. The WPLEDs exhibited low turn-on voltage (6.0-7.5 V) and low efficiency-roll-off, which are advantageous to organo-Eu3+ doped WOLEDs.

Original languageEnglish
Pages (from-to)4800-4807
Number of pages8
JournalJournal of Materials Chemistry C
Volume7
Issue number16
DOIs
Publication statusPublished - 1 Jan 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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