Jiahong Li,Zhan Du,Xiaoshuang Li,Limin Zhang,Liangyi Gu,Daxi Pan,Jingrui Zhang,Bo Wang
This study presents the synthesis of Mo 4+ -doped Cs 4 ZnBi 2 Cl 12 double perovskite through a hydrothermal method, demonstrating efficient near-infrared (NIR) emission at 1110 nm with a full width at half maximum (FWHM) of 45 nm. The emission originates from the d-d transition of Mo 4+ ions within an octahedral crystal field. Structural analysis using powder X-ray diffraction (PXRD) confirms the phase purity and lattice contraction as a result of Mo 4+ substitution at Bi 3+ sites, supported by X-ray photoelectron spectroscopy (XPS) and elemental mapping. The material exhibits broad excitation compatibility (348–590 nm) and achieves a photoluminescence quantum yield (PLQY) of 45.3% with a microsecond-scale lifetime of 6.78 μs. Thermal stability tests demonstrate sustained emission intensity (58% at 420 K) and resilience to prolonged heating or UV exposure. This work highlights Mo 4+ -doped Cs 4 ZnBi 2 Cl 12 as a stable and efficient NIR emitter, advancing lead-free perovskites for optoelectronic applications in bioimaging, agriculture, and sensing.
Jun Liu,Jianen Zhang,Qi Xue,Huiying Gao,Shirui Zhang,Jinfeng Xie,Li Guan,Xiaohong Zhang,He Huang
The development of high-performance transparent conductors (TCs) is critical for advancing transparent electronics and optoelectronic devices. While n-type TCs are well established, the development of p-type TCs remains hindered by the limited availability of suitable materials. In this study, the layered double perovskite Cs 4 ZnBi 2 Cl 12 was synthesized as a promising p-type TC, which exhibits a wide direct band gap of 3.56 eV and intrinsic p-type conductivity. A hydration-mediated strategy was developed to trigger a near-spherical nanocrystal-to-nanorod transformation and modulate the electronic structure. First-principles calculations clarify that the lattice compressive strain induced by hydration significantly reduces the hole effective mass while increasing conductivity from 8.99 to 9.21 mS cm −1 , outperforming traditional p-type TCs, such as CuAlO 2 (3.4 mS cm −1 ) and SrCu 2 O 2 (0.48 mS cm −1 ). These findings not only provide experimental validation of the theoretical predictions regarding Cs 4 ZnBi 2 Cl 12 as a p-type TC but also establish a hydration strategy for optimizing the optical and electrical performance of layered double perovskites.
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