Driving conditions dependence of magneto-electroluminescence in tri-(8-hydroxyquinoline)-aluminum based organic light emitting diodes

TL;DR

This study examines how different driving conditions, such as constant versus pulse voltage, affect the magneto-electroluminescence behavior in Alq3-based OLEDs, revealing significant dependence on operational parameters.

Contribution

It provides a comparative analysis of MEL behavior under steady-state and transient conditions, highlighting the impact of driving voltage type on magnetic field responses in OLEDs.

Findings

MEL behavior varies significantly between constant and pulse voltage driving conditions.

Negative MELs occur at high magnetic fields and voltages.

MELs increase to a maximum then decrease with magnetic field under pulse driving.

Abstract

we investigated the magneto-electroluminescence (MEL) in tri-(8-hydroxyquinoline)-aluminum based organic light-emitting diodes (OLEDs) through the steady-state and transient method simultaneously. The MELs show the great different behaviors when we turn the driving condition from a constant voltage to a pulse voltage. For devices driven by the constant voltage, the MELs are similar with the literature data; for devices driven by the pulse voltage, the MELs are quite different, they firstly increase to a maximum then decrease as the magnetic field increases continuously. Negative MELs can be seen when both the magnetic field and driving voltage are high enough.