In situ passivation and thiol-mediated anchoring of perovskite quantum dots in mesoporous covalent-organic frameworks

• Chemical bonding tightly anchors CsPbX 3 in the channel of functionalized COFs. • Ultrafast fs-TA kinetics reveal the elimination of trap centers in CsPbX 3 @COF-SH. • The FDTD simulations show the strong waveguide effect in CsPbX 3 @COF-SH. • The CsPbX 3 @COF-SH composites exhibit ultra-high PLQY and greatly enhanced stability. • The CsPbX 3 @COF-SH composites can be applied in warm W-LED field. Metal halide perovskite quantum dots (PQDs) are considered as promising candidate for the next generation optoelectronic applications. However, their development is severely restricted by their poor stability. Here, we demonstrate the in situ growth of PQDs in the ordered channels of functionalized covalent-organic frameworks (COFs). The strong S-Pb chemical binding firmly anchors the PQDs in COF matrix, which prevent the aggregation of PQDs and eliminate the nonradiative trap centers of PQDs, leading to the high photoluminescence quantum yield (81.5 %) and remarkable stability. Femtosecond transient absorption spectroscopy reveal the elimination of nonradiative trap centers in PQD@COFs. Theoretical simulation results demonstrate the strong waveguide effect in PQD@COFs, which reduces the reabsorption loss. Further, the obtained white light-emitting diode exhibits ultrahigh luminous efficiency of 89.6 lm/W and excellent operating stability, which paves the way for the commercial application of PQDs.