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D–π–A–π–D-type Fluorophores based on Pyridal[2,1,3]thiadiazole acceptor with hybridized local and charge-transfer excited-state for high-efficiency OLEDs by Yue Yu; Zhiliang Yu; Zetong Ma; Jianxia Jiang; Dehua Hu is a Materials Science article available to read on EtoBox.

What is D–π–A–π–D-type Fluorophores based on Pyridal[2,1,3]thiadiazole acceptor with hybridized local and charge-transfer excited-state for high-efficiency OLEDs about?

Hybridized local and charge-transfer (HLCT) excited-state fluorophores, which are characterized by high photoluminescence quantum yield (PLQY) and reverse intersystem crossing (RISC) from high-lying triplets to singlets, has emerged advantages in organic light-emitting diodes (OLEDs) application. Although blue and green HLCT fluorophores are well developed, the long wavelength ones (orange to red) are still behind. Here, based on more electron-deficient Pyridal[2,1,3]thiadiazole (PT) acceptor, a D–π–A–π–D-type HLCT emitter, namely 2CZP-PT, with orangered emission is designed and synthesized. Due to the less steric hindrance of pyridine nitrogen in PT, a small twist angle between the π bridge and acceptor on the nitrogen side is obtained, which endows the whole molecule with relative planar conformation. Thus 2CZP-PT exhibits HLCT characteristics with high PLQY (77% in THF solution and 44% in neat film), as well as energy levels arrangement favoring the RISC process from high-lying triplet levels to singlet levels. The doped devices based on 2CZP-PT reached a maximum external quantum efficiency (EQEs) of 9.57% with an electroluminescence (EL) peak at 568 nm. While the non-doped OLED

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Author

Yue Yu; Zhiliang Yu; Zetong Ma; Jianxia Jiang; Dehua Hu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)