Abstract Broadband emissive perovskites are next‐generation materials for solid‐state lighting and radiative detection. However, white‐emitting perovskites are generally synthesized by regulating B/X sites, while not enough attention is paid to the A‐site, which is thought to hardly affect the band‐edge structures and optoelectronic properties. Here, a series of Sb 3+ ‐doped In‐based 0D halide perovskite derivatives are described with various organoammonium cations in A‐sites. Warm‐white light emitting across the visible spectrum (450–850 nm), large Stokes shifts, and high photoluminescence quantum yields are easily tunable by molecularly tailoring A‐site cations. These features enable a light yield up to 60976 Photons/MeV as X‐ray scintillator, and a detection limit of 90 nGy air /s that is ≈60 times lower than the medical requirement. It is proved that A‐site plays a critical role in determining the degree of distortion of polyhedra, which influences the broadband photoluminescence and self‐trapped exciton (STE) dominates the emission process. Moreover, for the first time, via the incorporation of 2,6‐dimethylpiperazine, a mixed A‐site regulating strategy produces a standard white‐light emission, which originates from the blue‐light and yellow‐light related to various STE emission centers. It is foreseen that this strategy highlights the expanded role of A‐site and the importance of rethinking A‐sites in perovskites.

Quantum yield

Visible spectrum

Light emission

10.1002/adfm.202309112

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Color Turning of One-Dimensional Broadband Emissive Organic Lead Bromide Perovskites

The Journal of Physical Chemistry C (2024)

Qinyi Zhu Shuoshuo Zang Guoqing Xu Yan Yu Hewen Liu

To determine the important structural factors affecting the broadband fluorescence colors of one-dimensional (1D) perovskite materials, a comparative study is carried out in this work. Two 1D organic lead bromide perovskites are synthesized, i.e., ppPbBr3 and bpPbBr3, using phenyl pyrrolidine and benzyl pyrrolidine as the ligands, respectively. Just by changing the A site cations, the octahedral lead bromide structure in ppPbBr3 is a Jahn–Teller distortion structure, while those in bpPbBr3 is an off-centering structure. All of these octahedra form 1D straight lines via face-sharing. PpPbBr3 and bpPbBr3 exhibit broadband photofluorescence centered at 570 and 720 nm, respectively. Considering that their apparent band gaps are close, the off-centering octahedral structure has a stronger trapping energy to excitons than does the Jahn–Teller distortion structure. Our work shows that octahedral distortion is a key structural factor realizing color modulation of broadband fluorescence in these 1D perovskites.

Lead (geology)

10.1021/acs.jpcc.4c02556

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Synergistic mechanism of Ce-Mn in ZSM-5 carrier catalysts for catalytic oxidation of toluene

Fuel (2023)

Mengye Jin Tao Zhu Shouheng Li Lifeng Wang Yusheng Liu

Space velocity

Degradation

Mass fraction

Catalytic Oxidation

10.1016/j.fuel.2023.127921

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Citations (59)