Poly(para-phenyleneethynylene)s as emitters in polymer LEDs. Issue 41 (25th September 2018)

• Record Type: Journal Article
• Authors: Smarsly, Emanuel; Daume, Dominik; Braig, Felix; Koser, Silke; Dörsam, Edgar; Bunz, Uwe H. F.
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 41(2018)
• Page Start: 11002
• Page End: 11006
• Publication Date: 2018-09-25
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc03848a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : 11 different dialkoxy- and dialkyl-poly( para -phenyleneethynylene)s (PPE)s featuring novel branched and literature described sidechains were prepared using a Sonogashira coupling. The materials were tested as emitters in thickness dependent OLED devices. Abstract : 11 different dialkoxy- and dialkyl-poly( para -phenyleneethynylene)s (PPEs) featuring novel branched and literature described linear and branched side chains were prepared using a Sonogashira coupling. The side chains were of different length and branching character. The degree of polymerization of the PPEs ranged from Pn = 44–343 with polydispersities ranging from 1.5–3.1. Fairly simple OLED-stacks with up to three layers (electron injection, emitter layer, and hole injection) were produced. Depending upon the PPEs' structure and the stack architecture but particularly the thickness of the emitting PPE-layer, a large increase in brightness up to 2.2 × 10 3 cd m −2 was observed, a significant improvement over earlier reported values.