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Loop quantum gravity, as one branch of quantum gravity, holds the potentialto explore the fundamental nature of black holes. Recently, according to thequantum Oppenheimer-Snyder model in loop quantum cosmology, a novel loopquantum corrected black hole in de Sitter spacetime has been discovered. Here,we first investigate the corresponding quasinormal modes and late-time behaviorof massless neutral scalar field perturbations based on such a quantum-modifiedblack hole in de Sitter spacetime. The frequency and time domain analysis ofthe lowest-lying quasinormal modes is derived by Prony method, Matrix method aswell as WKB approximation. The influences of loop quantum correction, the blackhole mass ratio, and the cosmological constant on the quasinormal frequenciesare studied in detail. The late-time behaviors of quantum-modified black holespossess an exponential decay, which is mainly determined not only by themultipole number but also by the cosmological constant. The impact of loopquantum correction on the late-time tail is negligible, but it has asignificant impact on damping oscillation. To explore spacetime singularities,we examine the validity of strong cosmic censorship for a near-extremalquantum-modified black hole in de Sitter spacetime. As a result, it is foundthat the strong cosmic censorship is destroyed as the black hole approaches thenear-extremal limit, but the violation becomes weaker as the cosmologicalconstant and the loop quantum correction increase.

Scalar fields around a loop quantum gravity black hole in de Sitter spacetime: Quasinormal modes, late-time tails and strong cosmic censorship