Near-infrared multiphoton absorption and third harmonic generation with CsPbBr3 quantum dots embedded in micro-particles of metal–organic frameworks

Abstract

Materials with multiple nonlinear-optical responses have been investigated widely in recent years. Here, we report a hybrid system with both giant multiphoton absorption (MPA) and efficient third harmonic generation (THG) excited by near-infrared femtosecond laser pulses. The hybrid material consists of both CsPbBr₃ quantum dots and metal–organic framework microparticles. The two-, three-, four-, and five-photon absorption cross-sections of the hybrid material are three orders of magnitude greater than those of CsPbBr₃ micro-crystals. The effective χ⁽³⁾ values are three orders of magnitude greater than those of α-quartz. Our findings demonstrate a new avenue to realize photo-stable, high-order MPA, and THG in microparticles synthesized using a cost-effective method.