Room-temperature quantum sensing with photoexcited triplet electrons in organic crystals
arXiv:2402.13898 · doi:10.1103/PhysRevResearch.7.013192
Abstract
Quantum sensors have notably advanced high-sensitivity magnetic field detection. Here, we report quantum sensors constructed from polarized spin-triplet electrons in photoexcited organic chromophores, specifically focusing on pentacene-doped para-terphenyl (0.1%). We demonstrate essential quantum sensing properties at room temperature: electronic optical polarization and state-dependent fluorescence contrast, by leveraging differential pumping and relaxation rates between triplet and ground states. We measure high optically detected magnetic resonance (ODMR) contrast of the triplet states at room temperature, along with long coherence times under spin echo and CPMG sequences, s and s respectively, limited only by the triplet lifetimes. The material offers several advantages for quantum sensing, including the ability to grow large (-scale) crystals at low cost, the absence of paramagnetic impurities, and the diamagnetism of electronic states used for sensing when not optically illuminated. Utilizing pentacene as a representative of a broader class of spin triplet-polarizable organic molecules, this study highlights new potential for quantum sensing in chemical systems.
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