Abstract

Under hydrothermal conditions, a novel bimetallic thulium–mercury compound {[Tm(H₂O)₂(IA)₃]_2n[(Hg₆Br₁₃)_n]}(nHgBr₂)·4nH₂O·nH₃O (1) (IA = isonicotinato anion) was prepared and the crystal structure was characterized by single-crystal and powder X-ray diffraction. It is characterized by a three-dimensional (3D) framework with a novel two-dimensional (2D) inorganic [(Hg₆Br₁₃)_n] layer. Solid-state photoluminescence measurements revealed that compound 1 emits upconversion mazarine emission bands, which are originated from the ¹G₄ → ³H₆ and ¹D₂ → ³H₄ characteristic emissions of the 4f electron intrashell transitions of Tm(III) ions. An energy transfer mechanism is reported. Compound 1 displays CIE chromaticity coordinates of 0.1288 and 0.0635 in the mazarine region. A solid-state UV–Vis–NIR diffuse reflectance spectrum unveiled that compound 1 has a wide optical band gap of 2.69 eV. A thermogravimetry analysis measurement is also reported.

Graphic abstract

A novel bimetallic thulium–mercury compound was prepared and characterized. It features a 3D framework with a novel 2D inorganic [(Hg₆Br₁₃)_n] layer. It contains many mercury(II) ions with four different coordination environments. It emits upconversion mazarine photoluminescence emission peaks, which could be attributed to the ¹G₄ → ³H₆ and ¹D₂ → ³H₄ characteristic emissions of the 4f electron intrashell transitions of the Tm(III) ions. An energy level diagram was used to explain the energy transfer mechanism. It has CIE chromaticity coordinates of 0.1288 and 0.0635 in the mazarine region, and it possesses a wide optical band gap of 2.69 eV.

中文翻译：

---

具有三维骨架的新型双金属th汞化合物的合成，结构，光致发光，能带隙和能量转移机理

摘要

在水热条件下，新型双金属th汞化合物{[Tm（H ₂ O）₂（IA）₃ ] _{2 n} [（Hg ₆ Br ₁₃）_n ]}（n HgBr ₂）·4 n H ₂ O· n制备了H ₃ O（1）（IA =等离子阴离子），并通过单晶和粉末X射线衍射对晶体结构进行了表征。它的特征是具有新型二维（2D）无机[（Hg ₆ Br ₁₃）_n]层。固态光致发光测量表明，化合物1发射上转换的马扎林发射带，其起源于Tm（III）离子的4 f电子壳内跃迁的¹ G ₄  →  ³ H ₆和¹ D ₂  →  ³ H ₄特征发射。。报告了一种能量传递机制。化合物1在马扎林区域显示的CIE色度坐标为0.1288和0.0635。固态UV–Vis–NIR漫反射光谱揭示了化合物1具有2.69 eV的宽光学带隙。还报道了热重分析测量。

图形摘要

制备并表征了一种新型的双金属th-汞化合物。它具有3D框架和新颖的2D无机[（Hg ₆ Br ₁₃）_n ]层。它包含具有四个不同配位环境的许多汞（II）离子。它发出上转换的马扎林光致发光发射峰，这可能归因于4 f的¹ G ₄  →  ³ H ₆和¹ D ₂  →  ³ H ₄特征发射。Tm（III）离子的电子壳内跃迁。使用能级图来解释能量传递机制。它在马扎林区域的CIE色度坐标为0.1288和0.0635，并且具有2.69 eV的宽光学带隙。