Resolving the Spatial Variation and Correlation of Hyperfine Spin Properties in Organic Light-Emitting Diodes

Devices that exploit the quantum properties of materials are widespread, with quantum information processors and quantum sensors showing significant progress. Organic materials offer interesting opportunities for quantum technologies owing to their engineerable spin properties, with spintronic operation and spin resonance magnetic-field sensing demonstrated in research grade devices, as well as proven compatibility with large-scale fabrication techniques. Yet several important challenges remain as moving toward scaling these proof-of-principle quantum devices to larger integrated logic systems or spatially smaller sensing elements, particularly those associated with the variation of quantum properties both within and between devices. Here, spatially resolved magnetoluminescence is used to provide the first 2D map of a hyperfine spin property-the Overhauser field-in traditional organic light-emitting diodes (OLEDs). Intra-device variabilities are found to exceed approximate to 30% while spatially correlated behavior is exhibited on lengths beyond 7 mu m, similar in size to pixels in state-of-the-art active-matrix OLED arrays, which has implications for the reproducibility and integration of organic quantum devices.

Automated summary

Devices that exploit the quantum properties of organic materials have shown significant progress in quantum information processing and sensing. However, challenges remain in scaling these devices and maintaining reproducibility due to variations of quantum properties within and between devices. This research provides the first 2D map of the hyperfine spin property in traditional organic light-emitting diodes (OLEDs) using spatially resolved magnetoluminescence. The study reveals high intra-device variabilities and spatial correlation, highlighting the implications for the reproducibility and integration of organic quantum devices.