Xiaoxia Liu,Weibing Zhang,Rui Xu,Jiayu Tu,Guoyong Fang,Yuexiao Pan
Lead-free zero-dimensional (0D) perovskite nanocrystals (NCs) with isolated octahedral structures have attracted considerable attention due to their unique photoelectric properties, such as highly efficient emissions with broadband features. A series of phosphors composed of Sb3+-doped 0D perovskite crystals Cs3ZnCl5 with wavelength-tunable emission spectra have been obtained using a facile recrystallization method at room temperature in air. By controlling the doping concentration of Sb3+ in Cs3ZnCl5 lattice, bright emissions from red to orange have been achieved under excitation at 320 nm due to the expansion of the crystal lattice, and the emission excited at 275 nm is bluish-white, spanning the full visible region. Inductively coupled plasma emission spectrometry (ICP) demonstrates the Sb3+ substitutes for Zn2+ rather than Cs+ due to the similar charges and ionic radii. The luminescence performance of phosphor Cs3ZnCl5:Sb3+ can be improved obviously by replacing 3 mol% of Cs+ with Rb+ or K+ due to the further distortion of the crystal lattice. The present approach allows the synthesis of large-scale emissive lead-free 0D perovskites activated by Sb3+ with tunable luminescence color.
In this research, we present an innovative, environmentally friendly, and cost-effective alcohothermal method for synthesizing Mn2+ and Mn2+–Cu+ doped 0D Cs3ZnCl5, a green luminescent material, marking the first time this approach has been reported. An exhaustive analysis of the luminescence properties of both undoped and doped Cs3ZnCl5 was conducted, with a particular emphasis on the energy transfer mechanisms in the Mn2+ mono-doped and Mn2+–Cu+ co-doped systems. The results demonstrate the successful construction of an efficient energy transfer pathway that significantly enhances the luminescence efficiency of Cs3ZnCl5:Mn2+. Specifically, the photoluminescence quantum yield of Mn2+ within the Cs3ZnCl5 matrix has been improved from 51.6% to 71.1%, thanks to the Cu+ codopant acting as an effective energy transfer mediator. A mechanism for the luminescence and energy transfer phenomena observed in the Mn2+–Cu+ co-doped Cs3ZnCl5 system has been also proposed. Furthermore, to assess the practical applicability of the synthesized materials, their structural and photoluminescent stability were evaluated. In essence, our study presents a promising solution to current challenges in the synthesis of advanced luminescent materials and opens up new possibilities for harnessing the potential of Mn2+-activated 0D metal halides in optoelectronic applications.
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