Abstract
During the past two decades, great effort has been dedicated to two-photon excited colloidal quantum dots (QDs) because of their unique optical properties and significant applications. Under two-photon excitation, colloidal semiconductor QDs and carbon-family QDs show the nonlinear two-photon absorption (TPA) that is essential to the applications of two-photon microscopy and fluorescence up-conversion. For the first time, this review systematically summarizes the optical properties and potential applications of two-photon excited colloidal QDs with different categories. The optical properties of two-photon excited colloidal QDs include the typical nonlinear optical behavior, TPA, two-photon excited fluorescence (TPEF), time-resolved TPEF and TPEF lifetimes. The applications of two-photon excited colloidal QDs are wholly covered, including the cellular and in vivo imaging, chem./bio-detection, photodynamic therapy, controlled drug release, photocatalysis, photoelectric conversion, etc. This review comments the recent advances in the vibrant topic of colloidal QDs, and also highlights the optical phenomenon, related mechanisms and important applications. Finally, the probable challenges and perspectives in the forthcoming development of two-photon excited colloidal QDs are addressed.
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