Sub-micron spin-based magnetic field imaging with an organic light emitting diode

Abstract

Quantum sensing and imaging of magnetic fields has attracted broad interests due to its potential for high sensitivity and spatial resolution. Common systems used for quantum sensing require either optical excitation (e.g., nitrogen-vacancy centres in diamond, atomic vapor magnetometers), or cryogenic temperatures (e.g., SQUIDs, superconducting qubits), which pose challenges for chip-scale integration and commercial scalability. Here, we demonstrate an integrated organic light emitting diode (OLED) based solid-state sensor for magnetic field imaging, which employs spatially resolved magnetic resonance to provide a robust mapping of magnetic fields. By considering the monolithic OLED as an array of individual virtual sensors, we achieve sub-micron magnetic field mapping with field sensitivity of ~160 µT Hz−1/2 µm−2. Our work demonstrates a chip-scale OLED-based laser free magnetic field sensor and an approach to magnetic field mapping built on a commercially relevant and manufacturable technology.

Magnetic Field Sensor Based on a OLED/Organic Photodetector Stack

“…Sensitivities for different sensor types themselves cannot be compared easily. This is due to different measured state variables for different sensor types, e.g., voltage for Hall-sensors, resistance for MR-based sensors, frequency for resonance-based magnetometers, , etc. However, it provides for a way to evaluate the accessible field range, linearity, and required readout electronics.…”

“…One example is a matrix array made of Alq 3 OLED pixels that, due to the large MR of the organic emitter, allows for the use of pixels as both display and input by using a magnetic pen without the need to separate functionalities . Another example is very recent single OLED sensor makes use of optically detected magnetic resonance to obtain sub-micron spatial resolution . Other recent research focuses on applications in which the flexible nature, printability, or the potential for cheap one-time use of organic devices provide a unique spot for organic-based sensors in the form of electronic skin. , High-performance inorganic materials define the active functionality, and organic compounds enable bio-compatible physical properties and interfaces, including electroencephalogram (EEG) measurements using passive electronic device patches consisting of PEDOT/PSS-coated Gold electrodes .…”

Advancements in stretchable organic optoelectronic devices and flexible transparent conducting electrodes: Current progress and future prospects

“…It offers high-resolution capabilities, allowing for fine feature sizes. Additionally, LITI is a non-contact and non-mechanical process, minimizing the risk of substrate damage and contamination [ 102 ]. Overall, laser-induced thermal imaging is an important technique in OLED manufacturing, facilitating the production of high-performance and high-resolution OLED displays [ 103 ].…”

Regioisomerism vs Conformation: Impact of Molecular Design on the Emission Pathway in Organic Light-Emitting Device Emitters

“…In recent years, a tremendous growth of research toward luminescent display and lighting technologies based on organic light-emitting devices (OLEDs) has been motivated by their low production costs, ease of processing, superior color purity, and performance. , Additionally, OLEDs have provided a significant platform in photodynamic therapy, , sensing technologies, and wearable electronics, among other applications . In this context, organic molecules that exhibit a phenomenon of thermally activated delayed fluorescence (TADF) can revolutionize the domain of OLED emitters as they are capable of harvesting both singlet and triplet excitons, giving, theoretically, 100% of internal quantum efficiency (IQE) .…”