The discovery of narrow-band luminescent materials remains an immense challenge to optimize the performance of white light-emitting diodes (LEDs). So far, the zero-dimensional (0D) Mn²⁺-based halides with near-unity narrow-band emissions have emerged as a class of promising phosphors in solid-state displays, but the related large-scale synthesis strategies have not been proposed and evaluated. Herein, we report an in situ synthetic process of 0D Mn²⁺-based halides and utilize (C₂₀H₂₀P)₂MnBr₄ as a case to investigate the photoluminescence characteristics and the structural essence of ultrafast self-assembly. The bright green emission peak at 523 nm with a full width at half maximum of 48 nm for (C₂₀H₂₀P)₂MnBr₄ is attributed to the d–d transition (⁴T₁–⁶A₁) of tetrahedrally coordinated [MnBr₄]^2– centers, and the fabricated white LED device shows a wide color gamut of 103.7% National Television System Committee (NTSC) standard. Remarkably, the experimental and theoretical results indicate that there are hydrogen bonding of C–H···Br and weak van der Waals interactions between [C₂₀H₂₀P]⁺ and [MnBr₄]^2–, resulting in the root for the realization of ultrafast self-assembly in 0D Mn²⁺-based halides. This work reveals a feasible and general synthesis method for preparing 0D Mn²⁺-based halides, thereby providing a possibility for their industrial application in solid-state displays.

中文翻译：

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揭示具有窄带绿色发射的零维 Mn2+ 基卤化物的超快自组装和光致发光

窄带发光材料的发现仍然是优化白光发光二极管 (LED) 性能的巨大挑战。迄今为止，具有近统一窄带发射的零维（0D）Mn ²⁺基卤化物已成为一类有前途的固态显示器荧光粉，但尚未提出相关的大规模合成策略并评估。在此，我们报道了 0D Mn ²⁺基卤化物的原位合成工艺，并利用 (C ₂₀ H ₂₀ P) ₂ MnBr ₄以研究超快自组装的光致发光特性和结构本质为例。(C ₂₀ H ₂₀ P) ₂ MnBr ₄在 523 nm 处的亮绿色发射峰与 48 nm 的半峰全宽归因于四面体配位的 d-d 跃迁 ( ⁴ T ₁ – ⁶ A ₁ ) [ MnBr ₄ ] ^2–中心，并且制造的白色 LED 设备显示出 103.7% 国家电视系统委员会 (NTSC) 标准的宽色域。值得注意的是，实验和理论结果表明，存在 C–H···Br 的氢键和 [C ₂₀ H ₂₀ P] ⁺和 [MnBr ₄ ] ^2–之间的弱范德华相互作用，导致在基于0D Mn ²⁺的卤化物中实现超快自组装。该工作揭示了一种制备0D Mn ²⁺基卤化物的可行且通用的合成方法，为其在固态显示器中的工业应用提供了可能。