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Towards efficient near-infrared fluorescent organic light-emitting diodes

Chemistry

Towards efficient near-infrared fluorescent organic light-emitting diodes

A. Minotto, I. Bulut, et al.

This groundbreaking research conducted by Alessandro Minotto, Ibrahim Bulut, Alexandros G. Rapidis, Giuseppe Carnicella, Maddalena Patrini, Eugenio Lunedei, Harry L. Anderson, and Franco Cacialli, presents a novel approach to near-infrared organic emitters, overcoming significant challenges related to the energy gap law and aggregation quenching. With a promising external quantum efficiency of ~1.1% at 850 nm, this work paves the way for high-luminance, heavy-metal-free emitters.

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Playback language: English
Abstract
The design of near-infrared (NIR) organic emitters is hindered by the energy gap law (*E<sub>G</sub>*-law) and aggregation quenching. This research achieves unprecedented results by addressing these limitations synergistically. Porphyrin oligomers with increasing length attenuate *E<sub>G</sub>*-law effects by suppressing non-radiative rate growth and increasing radiative rate via oscillator strength enhancement. Side chains suppress aggregation quenching. The logarithmic rate variation in the non-radiative rate vs. *E<sub>G</sub>* is suppressed by an order of magnitude. Organic light-emitting diodes demonstrate an average external quantum efficiency of ~1.1% at 850 nm, a promising result for a heavy-metal-free emitter. A novel quantitative model of internal quantum efficiency for active layers supporting triplet-to-singlet conversion is also presented. These findings provide a strategy for designing high-luminance NIR emitters.
Publisher
Light: Science & Applications
Published On
Jan 31, 2021
Authors
Alessandro Minotto, Ibrahim Bulut, Alexandros G. Rapidis, Giuseppe Carnicella, Maddalena Patrini, Eugenio Lunedei, Harry L. Anderson, Franco Cacialli
Tags
near-infrared emitters
energy gap law
aggregation quenching
porphyrin oligomers
organic light-emitting diodes
quantum efficiency
heavy-metal-free
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