Red-emitting fluorescent Organic Light emitting Diodes with low sensitivity to self-quenching

TL;DR

This study introduces a red-emitting OLED based on a novel fluorescent molecule that maintains high efficiency across a wide range of doping levels, reducing manufacturing constraints and improving device stability.

Contribution

The paper reports a new fluorescent molecule, FVIN, with low sensitivity to concentration quenching, enabling stable high-efficiency red OLEDs over various doping levels.

Findings

External quantum efficiency remains at 1.5% from 5% to 40% doping.

Achieves 1% efficiency with undoped active layer.

Deep red emission with CIE coordinates x=0.6, y=0.35.

Abstract

Concentration quenching is a major impediment to efficient organic light-emitting devices. We herein report on Organic Light-Emitting Diodes (OLEDs) based on a fluorescent amorphous red-emitting starbust triarylamine molecule (4-di(4'-tert-butylbiphenyl-4-yl)amino-4'-dicyanovinylbenzene, named FVIN), exhibiting a very small sensitivity to concentration quenching. OLEDs are fabricated with various doping levels of FVIN into Alq3, and show a remarkably stable external quantum efficiency of 1.5% for doping rates ranging from 5% up to 40%, which strongly relaxes the technological constraints on the doping accuracy. An efficiency of 1% is obtained for a pure undoped active region, along with deep red emission (x=0.6; y=0.35 CIE coordinates). A comparison of FVIN with the archetypal DCM dye is presented in an identical multilayer OLED structure.