Publication date: 21st July 2025
Besides conventional optoelectronic devices (LEDs and laser), colloidal quantum dots (QDs) are pursued as non-classical light sources (i.e. single photon emitters) that might play a pivotal role in future quantum technologies, such as quantum computing, quantum cryptography and quantum sensing. Due to strongly reduced charge trapping on surface states and their defect-tolerant character, perovskite QDs become attractive as alternative quantum light sources. Indeed, very stable, blinking-free emission1 has been observed at cryogenic temperatures with ultrafast radiative lifetime2, 3 and long exciton dephasing time4, 5. In addition, perovskite QDs exhibit remarkably optical properties even at room temperature6, 7. Their emission, however, is still affected by photoluminescence (PL) blinking, a random switching between bright and dark periods. In this work, we investigate individual QDs and demonstrate the critical role of surface chemistry in determining emission quality. We report on a new class of structurally diverse sulfonium ligands that provide robust surface passivation of perovskite nanocrystals (NCs), achieving photoluminescence quantum yields exceeding 90% (manuscript under review). Our results address a fundamental, long-standing challenge in colloidal chemistry and could pave the way toward the generation of ultra-pure, blinking-free single-photon emitters.
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