Optically Switchable NIR Photoluminescence of PbS Semiconducting Nanocrystals using Diarylethene Photoswitches Article Swipe
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· 2022
· Open Access
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· DOI: https://doi.org/10.1021/jacs.2c07102
· OA: W4296806892
Precisely modulated photoluminescence (PL) with external control is highly demanded in material and biological sciences. However, it is challenging to switch the PL <i>on</i> and <i>off</i> in the NIR region with a high modulation contrast. Here, we demonstrate that reversible <i>on</i> and <i>off</i> switching of the PL in the NIR region can be achieved in a bicomponent system comprised of PbS semiconducting nanocrystals (NCs) and diarylethene (DAE) photoswitches. Photoisomerization of DAE to the ring-closed form upon UV light irradiation causes substantial quenching of the NIR PL of PbS NCs due to efficient triplet energy transfer. The NIR PL fully recovers to an <i>on</i> state upon reversing the photoisomerization of DAE to the ring-open form with green light irradiation. Importantly, fully reversible switching occurs without obvious fatigue, and the high PL <i>on</i>/<i>off</i> ratio (>100) outperforms all previously reported assemblies of NCs and photoswitches.
