Abstract
A series of red fluorescent materials (compounds1–4), which each contain the symmetric fluorene–thiophene–BT–thiophene–fluorene core, is presented along with their performance in solution-processed OLED devices.
Highlights
A series of red fluorescent materials, which each contain the symmetric fluorene–thiophene– BT–thiophene–fluorene core, is presented along with their performance in solution-processed organic light-emitting diodes (OLEDs) devices
In this work we report the synthesis, characterisation and application of a family of molecular red emitters in solution-processed OLED devices (Fig. 1)
Achieved in two steps: firstly, 4,7-dibromo-2,1,3-benzothiadiazole (5), which was synthesised according to the literature,[26] was coupled with 2-(tributylstannyl)thiophene under Stille conditions to form compound 6.27 Compound 6 was brominated in the terminal a-positions using N-bromosuccinimide (NBS) to form the key intermediate 7.28 With this in hand, straightforward Suzuki–Miyaura couplings[29] with the boronic acid functionalised mono- or bifluorene (8 or 9)[30] furnished compounds 1 and 2, respectively
Summary
A series of red fluorescent materials (compounds 1–4), which each contain the symmetric fluorene–thiophene– BT–thiophene–fluorene core, is presented along with their performance in solution-processed OLED devices.
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