Organic-inorganic hybrid halides (OIHs) have attracted widespread attention because of their exceptional optoelectronic properties. In particular, Mn2+-based hybrid halides show intense green or red emission, which benefit from distinct d-d optical transition in Mn2+. This work deals with the dual-emission in two novel hybrid single-crystals (N-AEP)[MnCl3(H2O)3]2·Cl (1) and [(N-AEP)2MnCl6]·2Cl (2) (N-AEP3+ = C6H18N33+). Luminescence properties studies indicate that the low-energy emission is assigned to the Mn2+-based octahedron, while the high-energy emission ascribes to the organic cation [N-AEP]3+. Inorganic polyhedron transformation ([MnCl3(H2O)3]- to [MnCl6]4-) increased the luminescent intensity, which benefited from the weaker nonradiative transition in [MnCl6]4- octahedron. Significantly, by finely adjusting the excitation wavelength, complex 2 showed tunable emission properties, realizing the transition from “warm” white light (0.40, 0.33) to “cold” white light (0.28, 0.28). This paper offers a new example on the effective design of dual-emission materials.

中文翻译：

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[MnCl3（H2O）3]- 至 [MnCl6]4-： 无机多面体转变对发光特性的影响


有机-无机杂化卤化物 （OIH） 因其卓越的光电特性而引起了广泛关注。特别是，基于 Mn2+ 的杂化卤化物显示出强烈的绿色或红色发射，这得益于 Mn2+ 中明显的 d-d 光跃迁。本工作涉及两种新型杂化单晶 （N-AEP）[MnCl3（H2O）3]2·Cl （1） 和 [（N-AEP）2MnCl6]·2Cl （2） （N-AEP3+ = C6H18N33+）。发光特性研究表明，低能发射属于基于 Mn2+ 的八面体，而高能发射属于有机阳离子 [N-AEP]3+。无机多面体转化 （[MnCl3（H2O）3]- 到 [MnCl6]4-） 增加了发光强度，这得益于 [MnCl6] 4- 八面体中较弱的非辐射转变。值得注意的是，通过微调激发波长，复合物 2 显示出可调谐的发射特性，实现了从“暖”白光 （0.40， 0.33） 到“冷”白光 （0.28， 0.28） 的过渡。本文为双发射材料的有效设计提供了一个新实例。