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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

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Published on: November 16, 2018

A Magnetic field sensor based on OLED / organic photodetector stack.

Sebastian Engmann^1,2, Emily G Bittle², David J Gundlach²

¹Theiss Research, La Jolla, California 92037, United States.

ACS Applied Electronic Materials

|November 16, 2023

Summary

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Researchers developed a novel all-organic magnetic field sensor using an organic light-emitting diode (OLED) and organic photodetector (OPD). This flexible sensor leverages magneto-electroluminescence for sensitive magnetic field detection, enabling integration with existing OLED technology.

Area of Science:

Organic electronics
Sensor technology
Materials science

Background:

Magnetic field sensors are crucial in various applications.
Existing sensors often lack flexibility and printability.
Organic Light-Emitting Diodes (OLEDs) offer potential for novel sensor functionalities.

Purpose of the Study:

To present an all-organic magnetic field sensor.
To explore the integration of magnetic sensing into OLED technology.
To demonstrate printable and flexible magnetic field sensing capabilities.

Main Methods:

Fabrication of an organic light-emitting diode (OLED) and organic photodetector (OPD) layer stack.
Utilizing the large magneto-electroluminescence (MEL) effect in a thermally activated delayed fluorescence (TADF)-emitter based OLED.

Keywords:

Magnetic field response Magnetometer Organic Light Emitting Diodes Organic Photodetector P3HT/PCBM Thermally Assisted Delayed Fluorescence

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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes

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Characterization of sensor sensitivity and detectivity under varying magnetic fields.

Main Results:

Achieved a maximum sensitivity of 0.15 nA/mT at 3-4 mT magnetic fields.
Demonstrated improved sensitivity (2 nA/mT) and detectivity (< 10^-5 T·Hz^-1/2) using an external silicon detector.
Estimated intrinsic detectivity limit on the order of 10^-9 T·Hz^-1/2.

Conclusions:

An all-organic magnetic field sensor based on OLED-OPD stack is feasible.
The sensor offers printable and flexible magnetic sensing solutions.
Potential for integration into existing OLED displays and devices.