# Highly Emissive Hexa‐peri‐benzocoronene‐fluoranthene Hybrid as Easily Processable and Stable OLED Material

## TL;DR

A new fluorescent dye with high light emission and stability was developed for use in OLEDs, offering easy processing and improved performance.

## Contribution

A symmetry-broken hybrid dye with high photoluminescence quantum yield and easy processability for OLEDs is introduced.

## Key findings

- The dye exhibits a photoluminescence quantum yield of up to 67% in toluene.
- The distorted structure contributes to its optoelectronic properties and green emission at 500 nm.
- The molecule enables OLED fabrication without extensive optimization due to its high solubility and film-forming ability.

## Abstract

We report the synthesis of a fluorescent polycyclic aromatic hydrocarbon dye with a “symmetry‐broken” core, derived from the related hexa‐peri‐benzocoronene (HBC) core with a fluoranthene subunit. The fluorophore is composed of a pure carbon skeleton without heteroatoms and exhibits remarkable photoluminescence properties with a photoluminescence quantum yield (PLQY) of up to 67% in toluene, exceeding that of the parent HBC by a factor of 30. The single crystal X‐ray structure reveals the distorted polycyclic aromatic hydrocarbon structure, which is responsible for the optoelectronic properties, as supported by density functional theory calculations. We show that the new fluorescent dye can be readily used for the fabrication of organic light‐emitting diodes (OLED) without extensive optimization, whereby solubility in a variety of solvents and successful film formation are decisive.

A “symmetry‐broken” hexabenzocoronene‐fluoranthene fluorescent dye was synthesized using an easily scalable reaction. Green emission at around 500 nm, a maximum photoluminescence quantum yield of 67% in toluene, and high solubility in a wide range of solvents result from the distorted structure. A green organic light‐emitting diode (OLED) was fabricated without extensive optimization showcasing easy processability of the molecule class.