Electropolymerization of Starburst Triarylamines and Their Application to Electrochromism and Electroluminescence

Abstract

Starburst triarylamines 2 and 3 were electropolymerized to form electrochromic thin films. Film from 2 showed intense absorption at 372 nm before voltage was applied. There were two absorption bands at 496 nm and 1000-2000 nm at 0.3 V, and a broad band, which peaked at 807 nm at 0.6 V. Film from 3 showed intense absorption at 372 nm before voltage was applied. There were two absorption bands at 498 nm and 1000-2000 nm at 0.3 V, and a broad band, which peaked at 890 nm at 0.7 V. The switching time studies revealed that thin film from 2 would require 3 s at 0.46 V for switching absorbance at 1600 nm and 1 s for bleaching. It would also require 4 s at 0.66 V for coloration at 800 nm and 2 s for bleaching. On the other hand, thin film from 3 would require 3 s at 0.46 V for switching absorbance at 1500 nm and 1 s for bleaching. It would also require 3.3 s at 0.76 V for switching absorbance at 900 nm and 1.5 s for bleaching. Electropolymerized thin films of 2 and 3 were also used as the surface modification layers to modify the surface of ITO for polymeric light emitting diode (PLED). To evaluate the performance of the modification layer, we selected a device of ITO/modification layer/PVK-Alq 3 -coumarin 6/metal electrode as the standard for comparison. We discovered that co-electropolymerization of the triarylamines 2 or 3 with poly(vinylcarbazole) (PVK) on ITO greatly reduces the turn-on voltage of the PLED devices and their performance is comparable to that of the commercially available PEDOT.

Synthesis, photophysical and electrophosphorescent properties of mononuclear Pt(II) complexes with arylamine functionalized cyclometalating ligands

“…The oxidation potential of the 4-phenyl-substituted C^N^N ligand (HL 1 ) is beyond the potential window of the solvent, therefore no oxidation peak could be observed. The CV spectrum shows single oxidation peak at +0.59 V for HL 2 , according to forming a radical cation species arising from the loss of a single electron in the arylamino unit [51]. For ligand HL 3 with a bis-arylamino unit, two oxidation peaks are present at +0.03 and +0.55 V, which involve two consecutive one-electron transfer processes to form a di(cation radical) species [52].…”

Organische gemischtvalente Verbindungen: ein Spielplatz für Elektronen und Löcher

“…In einem ersten Versuch stellten Leung et al [306] dünne Schichten von elektropolymerisierten sternfçrmigen Dendrimeren 232 her (Schema 83). Bei Oxidation zeigten diese Filme die charakteristischen breiten und intensiven Banden im NIR (1000 bis > 2000 nm), die für IV-CT-Banden von Triarylamin-Redoxzentren typisch sind.…”

Electropolymerization and characterization of an alternatively conjugated donor–acceptor metallopolymer: Poly-[Ru(4′-(4-(Diphenylamino)phenyl)-2,2′:6′,2″-Terpyridine)2]2+

“…Though it has been well known that both transition metal terpyridine (TPY) complexes with functional groups [14][15][16][17] and arylamines [18][19][20] are excellent electroactive materials for preparing optical/electronic ultrathin films, electropolymerization of the hybrid polymer incorporated of electron-deficient Ru(II)-TPY complex directly into the π-conjugated triphenylamine-based polymer backbone has so far never been reported yet. In this paper, the electro-active triphenylamine moiety was introduced at 4-position of TPY to form the functionalized Ru(II) complex, and its oxidative electropolymerization behaviour and the spectroscopic, electrochemical and spectroelectrochemical properties of as-formed D-A polymer were investigated.…”

“…With another intriguing aspect, the film thickness and morphology can be easily tuned by controlling the electrochemical parameters (potential, current, and deposition time), which is of great importance whenever surface coating is concerned [13]. In addition, oxidative and reductive doping to the conductive form can be achieved in situ electrochemically, allowing these polymers to be easily switched from the conductive to insulating state.Though it has been well known that both transition metal terpyridine (TPY) complexes with functional groups [14][15][16][17] and arylamines [18][19][20] are excellent electroactive materials for preparing optical/electronic ultrathin films, electropolymerization of the hybrid polymer incorporated of electron-deficient Ru(II)-TPY complex directly into the π-conjugated triphenylamine-based polymer backbone has so far never been reported yet. In this paper, the electro-active triphenylamine moiety was introduced at 4-position of TPY to form the functionalized Ru(II) complex, and its oxidative electropolymerization behaviour and the spectroscopic, electrochemical and spectroelectrochemical properties of as-formed D-A polymer were investigated.…”