Perfectly Regioregular Electroactive Polyolefins: Impact of Inter-Chromophore Distance on PLED EQE

Abstract

Acyclic diene metathesis polymerization (ADMET) was used to synthesize a series of perfectly regioregular polyolefins, in which the number of backbone atoms between pendant terfluorene groups was precisely controlled at 8, 14, or 20 carbons. Analogous random copolymers containing identical chromophore densities were also synthesized to study the impact of regioregularity on the performance of this class of materials in polymer light emitting diodes (PLEDs). Additionally, the backbone alkene remnants of ADMET were saturated to generate materials with somewhat different ordering. These saturated derivatives led to improvements in PLED external quantum efficiencies (EQEs) over their unsaturated analogues in most cases, with a large improvement in one material. Charge mobility, as manifested in current density during PLED characterization, and relative solid-state fluorescence quantum yield (Φ F ) also exhibit reasonable dependencies, with longer distances between electroactive groups yielding lower PLED current densities and higher Φ F . Regioregularity has the opposite effect, giving rise to higher current densities and lower Φ F as compared to regiorandom analogues.

Ethylene–ethyl acrylate copolymers via ADMET polymerization: Effect of sequence distribution on thermal properties

“…Not surprisingly, linear relationship was observed between T m values of the saturated random copolymers and the ethyl acrylate molar ratio in these samples [see Fig. (D)] . This result indicates that the T m values are highly predictable according to this working curve for this family of random copolymers with low‐to‐moderate (9–22 mol %) ethyl acrylate content.…”

ADMET polymerization in affordable, commercially available, high boiling solvents

“…In each of these cases the morphology of the final polymer can be known without ambiguity making this synthetic approach useful for developing a deeper understanding of the structure-property relationships [7,11,12]. Some closely studied ADMET polymers have potential uses in optoelectronics [13][14][15], ion transport [11,16], and polymer-based pharmaceuticals [17][18][19].…”

Synthesis and photophysical properties of polyethylene containing pyrenyl units in the side chain

“…Some olefin‐based polymers functionalized with fluorescent groups have been synthesized. The polymers having fluorenyl groups in the side chain were synthesized by various methods, for example, polymerization of cycloolefins, acetylenes, or divinyl monomers having fluorenyl group 1–5. The polymers showed efficient fluorescence derived from the fluorenyl units 2, 3, 5.…”

“…The polymers having fluorenyl groups in the side chain were synthesized by various methods, for example, polymerization of cycloolefins, acetylenes, or divinyl monomers having fluorenyl group 1–5. The polymers showed efficient fluorescence derived from the fluorenyl units 2, 3, 5. We reported synthesis of olefin‐based copolymers having fluorescent group by means of the copolymerization of ethylene or propylene with allyl monomers containing 9‐fluorenyl group, diallyl‐di‐9‐fluorenylsilane (DAFS), 9,9‐diallylfluorene (DAF), and 9‐allylfluorene (AF) with zirconocene catalysts 6.…”