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摘要
Sb3+ doping in a zero-dimensional [(CH3)(4)N](2)SnCl6 perovskite induces asinglet/triplet double emission at room temperature. The activationof singlet emission might be contributed by the large energy separationbetween the lowest excited triplet states and the lowest excited singletstates. The singlet emission together with the triplet emission canbe regulated by excitation wavelength in situ. In addition, Bi3+ is co-doped into Sb3+@[(CH3)(4)N](2)SnCl6, resulting in a photoluminescenceex situ regulation. @@@ Metal ion-doped zero-dimensional halide perovskites providegoodplatforms to generate broadband emission and explore the fundamentaldynamics of emission regulations. Recently, Sb3+-dopedzero-dimensional halide perovskites have attracted considerable attentionfor the high quantum yield of yellow emission; however, the tripletstate recombination is activated and the singlet state emission isusually absent. Herein, we fabricate an Sb3+-doped zero-dimensional[(CH3)(4)N](2)SnCl6 perovskitethat can induce singlet and triplet emission. Density functional theorycalculation shows that there are some overlaps between the highestoccupied molecular orbitals and the lowest unoccupied molecular orbitals,which may induce a large energy separation between the lowest excitedtriplet states (T-1) and the lowest excited singlet states(S-1) [& UDelta;E(S-1 -T-1)], impeding all the carriers' transfer from thesinglet state to the triplet state. As a result, the reserved singletemission together with the triplet emission can be regulated by excitationwavelength in situ. In addition, different Bi3+ ratiosare co-doped into Sb3+@[(CH3)(4)N](2)SnCl6, resulting in a photoluminescence ex situregulation. Single-phase white light LED and optical anti-counterfeitingare developed further.
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