Abstract
Volumetric optical imaging of magnetic fields is challenging with existing magneto-optical materials, motivating the search for dyes with strong magnetic field interactions, distinct emission spectra, and an ability to withstand high photon flux and incorporation within samples. Here, the magnetic field effect on singlet-exciton fission is exploited to demonstrate spatial imaging of magnetic fields in a thin film of rubrene. Doping rubrene with the high-quantum yield dye dibenzotetraphenylperiflanthene (DBP) is shown to enable optically pumped, slab waveguide lasing. This laser is magnetic-field-switchable: when operated just below the lasing threshold, application of a 0.4 T magnetic field switches the device between nonlasing and lasing modes, accompanied by an intensity modulation of +360%. This is thought to be the first demonstration of a magnetically switchable laser, as well as the largest magnetically induced change in emission brightness in a singlet-fission material to date. These results demonstrate that singlet-fission materials are promising materials for magnetic sensing applications and could inspire a new class of magneto-optical modulators.
Highlights
The MIT Faculty has made this article openly available
To study the utility of singlet-fission materials as magnetic field sensors, we fabricate thin films of rubrene doped with 0.5 vol% DBP, a high-photoluminescence quantum yield (PLQY) emitter dye with a singlet state slightly below that of rubrene.[16]
This material system has already earned attention for efficient nearinfrared to visible photon upconversion.[17,18,19,20]
Summary
The MIT Faculty has made this article openly available. Please share how this access benefits you. Collin F, Einzinger, Markus, Finley, Joseph, Bawendi, Moungi G and Baldo, Marc A.
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