Solution-Processible Phosphorescent Blue Dendrimers Based on Biphenyl-Dendrons and Fac-tris(phenyltriazolyl)iridium(III) Cores

Shih-Chun Lo, Raghu Nath Bera, Ruth Emma Harding, Paul L. Burn, Ifor David William Samuel

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

Solution-processible saturated blue phosphorescence is an important goal for organic light-emitting diodes (OLEDs). Fac-tris(5-aryltriazolyl)iridium(III) complexes can emit blue phosphorescence at room temperature. Mono- and doubly dendronized fac-tris (1-methyl-5-phenyl-3-n-propyl-1H-[1,2,4]triazolyl)iridium (III) 1 and fac-tris{1-methyl-5-(4-fluorophenyl)-3-n-propyl-1H-[1,2,4] triazolyl}iridium(III) 4 with first generation biphenyl-based dendrons were prepared. The dendrimers emitted blue light at room temperature and could be solution processed to form thin films. The doubly dendronized 3 had a film photoluminescence quantum yield of 67% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.1.7, 0.33). OLEDs comprised of a neat film of dendrimer 3 and an electron transport layer achieved a brightness of 142 cd m(-2) at 3.8 V with an external quantum efficiency of 7.9%, and CIE coordinates of (0.18, 0.35). Attachment of the fluorine atom to the emissive core had the effect of moving the luminescence to shorter wavelengths but also quenched the luminescence of the mono- and doubly dendronized dendrimers.

Original languageEnglish
Pages (from-to)3080-3090
Number of pages11
JournalAdvanced Functional Materials
Volume18
Issue number19
DOIs
Publication statusPublished - 9 Oct 2008

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