Low-dimensional-networked metal halides are attractive for the screening of emitters applied in solid-state lighting and displays, but the lead toxicity and poor stability are obstacles that must be overcome in industrial applications. Herein, we aim at the discovery of bright and stable photoluminescence in zero-dimensional (0D) Mn²⁺-based metal halides. By manipulation of Cl/Br transmutation, the nature of the halogen can be confirmed as a pivotal factor to tune the PL behaviors, and the optimum Mn²⁺ emission with a high PLQY of 99.8% and a short lifetime of 0.372 ms can be achieved in (C₂₄H₂₀P)₂MnBr₄. The thermal quenching behaviors have been discussed in depth, indicating that the synergistic effect of good chemical stability of organic groups, a long Mn⋯Mn distance of 10.447 Å and a relatively large activation energy (ΔE = 0.277 eV) provides a platform for achieving excellent thermal stability in (C₂₄H₂₀P)₂MnBr₄. Moreover, the as-fabricated white LED device with a high luminous efficacy of 118.9 lm W⁻¹ and a wide color gamut of 105.3% National Television System Committee (NTSC) shows that (C₂₄H₂₀P)₂MnBr₄ can be employed as a desirable narrow-band green emitter for LED displays. This work provides a new understanding of fine tailoring halogens, and proposes a feasible approach to achieving high thermal stability emitters toward the targeted practical applications.

中文翻译：

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零维Mn2 +基金属卤化物中Cl / Br转变向可调光致发光和热猝灭行为的操纵

低维网络金属卤化物对于筛选应用于固态照明和显示器的发射器非常有吸引力，但是铅的毒性和稳定性差是工业应用中必须克服的障碍。本文中，我们旨在发现零维（0D）Mn ²⁺基金属卤化物中的明亮且稳定的光致发光。通过操纵Cl / Br的转变，可以确认卤素的性质是调节PL行为的关键因素，并且可以获得最佳的Mn ²⁺发射，其PLQY高达99.8％，寿命短至0.372 ms在（C ₂₄ H ₂₀ P）₂ MnBr _4中。已经深入讨论了热淬灭行为，表明有机基团的良好化学稳定性，较长的Mn⋯Mn距离为10.447Å和相对较大的活化能（ΔE = 0.277 eV）的协同效应提供了实现这一目标的平台。在（C ₂₄ H ₂₀ P）₂ MnBr _4中具有出色的热稳定性。此外，具有118.9 lm W ^-1的高发光效率和105.3％的宽色域的美国国家电视系统委员会（NTSC）所制造的白色LED器件显示（C ₂₄ H ₂₀ P）₂ MnBr ₄可以用作LED显示器的理想的窄带绿色发射器。这项工作为精制卤素提供了新的认识，并提出了一种针对目标实际应用实现高热稳定性发射体的可行方法。