The Effect of Acceptor Structure on Emission Color Tuning in Organic Semiconductors with D-π-A-π-D Structures.

Przemyslaw Ledwon,Marian Chapran,Radoslaw Motyka,Gabriela Wiosna-Salyga

doi:10.3390/nano9081179

Przemyslaw Ledwon, Marian Chapran + Show 2 more

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https://doi.org/10.3390/nano9081179

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Abstract

A series of novel donor–acceptor D–π–A–π–D compounds were synthesized and characterized in order to determine the influence of different acceptor units on their properties. The introduction of acceptor moieties had a direct impact on the HOMO and LUMO energy levels. Fluorescence spectra of compounds can be changed by the choice of an appropriate acceptor and were shifted from the green to the near-infrared part of spectra. Due to observed concentration induced emission quenching, the green exciplex type host was used to evaluate the potential of synthesized molecules as emitters in organic light emitting diodes (OLEDs).

Highlights

Donor–acceptor compounds are an important group of π-conjugated organic materials
It is worth noting that the last step must be performed in a nonpolar solvent because when the reaction was carried out in polar solvents such as DMF, compound C5 was the main product, which is a product of the homo-coupling of compound 7
It was found that introducing different acceptor moieties in studied D–π–A–π–D compounds allows a narrow optical bandgap, and the consequential shift fluorescence emission from the green to near-infrared part of spectra

Summary

Introduction

Donor–acceptor compounds are an important group of π-conjugated organic materials. One of the main factors affecting the properties of such fluorescent compounds is their structure, which includes a donor, an acceptor, and a linker between the two. There is an increasing demand for NIR emitters in sensing, in areas such as medicine [9], optical communication, lasers, and the automotive industry. This means that the market for these devices in the near future may be one of the most rapidly developed areas of research. In this respect, a study focusing on emission tuning to achieve deep-red and infrared emission is important. The development of new emitters with an entire palette of emission colors is highly justified

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