【摘要】 Mn离子掺杂策略被广泛用于提高CsPbX₃钙钛矿纳米晶（Nanocrystals,NCs）的稳定性和调控Pb的含量，但离子掺杂反应速率极快，不易控制。本文分别采用一步和两步热注射法对Mn²⁺的掺杂含量进行大范围和精确调控，制备出具有不同Mn²⁺掺杂含量的CsPbCl₃∶Mn²⁺NCs。通过对其结构及发光性能的研究，将其区分为合金结构和掺杂结构，并进一步揭示了一步法和两步法进行Mn²⁺调控时的不同机制，明确了在相同Pb∶Mn投料比的情况下，一步法合成的合金结构纳米晶具有更高的Mn²⁺掺杂量，使得纳米晶在610nm左右与Mn相关的发射峰更为强烈，最高光致发光量子产为77%，而两步法合成的掺杂结构纳米晶在较少的Mn²⁺情况下同样具有较高的光致发光量子产率。同时，Mn²⁺的可控掺杂使得钙钛矿纳米晶的稳定性有效提升，放置四周后形貌和发光性能仍稳定。值得注意的是，合金结构对于本征激子发光稳定性的提升比掺杂结构更加有利。此外，还合成了具有优异发光性能的CsPb(Cl_xBr_3-x)∶Mn²⁺钙钛矿纳米晶，其荧光光谱可在404～640nm之间调控；但当Br^-含量较高时，与Mn相关的发射峰消失，这是由于CsPbBr₃的能带与Mn²⁺的⁴T₁‐⁶A₁能级不匹配所致。本文强调了在CsPbCl₃∶Mn²⁺钙钛矿制备过程中Mn²⁺可控掺杂的重要性，对于实现纳米晶的可控合成具有重要意义。更多还原

【Abstract】 Mn ion doping strategy emerged as a widely employed strategy for enhancing the stability of Cs Pb X₃perovskite nanocrystals （NCs） and regulating Pb content.Nevertheless,the rapid reaction rate associated with ion doping poses significant challenges for controllable synthesis.Herein,we have employed both the one-step and two-step hot injection methods to synthesize Cs Pb Cl₃∶Mn²⁺NCs with varying levels of Mn²⁺doping,allowing for ap‐proximate and precise control of Mn²⁺incorporation.Through an investigation of their structural and luminescent properties,these NCs are divided into alloy structure and doping structure,elucidating distinct mechanisms in‐volved in one-step and two-step Mn²⁺regulation.The alloy structure nanocrystals synthesized by one-step method have higher Mn²⁺doping amount than that by two-step method under the same Pb∶Mn feeding ratio.Consequently,the Mn-related emission peak of nanocrystals at about 610 nm is more intense with maximum photoluminescence quantum yield （PLQY） of 77%,and the PLQY of the doped nanocrystals synthesized by the two-step method is al‐so higher in the case of less Mn²⁺.At the same time,the controlled doping of Mn²⁺improves the stability of perovskite nanocrystals,and the original morphology and luminescence properties remained stable after four weeks.Notably,alloy structure is more favorable for improving the luminescence stability of intrinsic excitons com‐pared with doping structure.In addition,Cs Pb(Clx Br_3-x)∶Mn²⁺perovskite nanocrystals with excellent luminescent properties have been synthesized.The fluorescence spectrum can be regulated between 404-640 nm,but when the Br^-content is high,the emission peak associated with Mn disappears.This is due to the mismatch between the en‐ergy band of Cs Pb Br₃ and the ⁴T₁-⁶A₁ energy level of Mn²⁺.This paper emphasizes the significance of precise Mn²⁺doping control in the preparation of Cs Pb Cl₃∶Mn²⁺perovskite NCs,which is of great significance for the controlled synthesis of nanocrystals.更多还原