Abstract

A novel two-dimensional (2-D) bimetallic erbium-mercury compound {[Er(IA)(HIA)₂(H₂O)₂]₂(Hg₃Br₈)}_n(nHgBr₂)·2nNO₃ (denoted as 1; HIA = isonicotinic acid; IA = isonicotinato anion) was prepared and characterized. Compound 1 crystallizes in the space group P2/c of the monoclinic system. By using solid state samples, it was observed that there are three upconversion photoluminescence emission bands at 400 nm, 475 nm and 526 nm, of which the band at 526 nm is the strongest. These bands can be attributed to the ⁴F_9/2 → ⁴I_15/2, ⁴F_7/2 → ⁴I_15/2 and ²H_11/2 → ⁴I_15/2 transitions of the Er³⁺ ions, respectively. An energy transfer mechanism of the photoluminescence emission bands was described with the energy state diagram of the Er³⁺ ion and the isonicotinic acid molecule. Compound 1 is characteristic of CIE (Commission Internationale de I'Éclairage) chromaticity coordinates of 0.1479 and 0.4321 in the green region. Compound 1 shows a wide optical band gap of 2.39 eV.

摘要

一种新型二维(2- D )双金属铒汞化合物{[Er(IA)(HIA) ₂ (H ₂ O) ₂ ] ₂ (Hg ₃ Br ₈ )} _n ( n HgBr ₂ )·2 n NO制备并表征了₃（表示为1；HIA = 异烟酸；IA = 异烟酸阴离子）。化合物1在空间群P 2/ c 中结晶单斜晶系。通过使用固态样品，观察到在 400 nm、475 nm 和 526 nm 处有 3 个上转换光致发光发射带，其中 526 nm 处的带最强。这些带可归因于Er ³⁺离子的⁴ F _9/2 → ⁴ I _15/2、⁴ F _7/2 → ⁴ I _15/2和² H _11/2 → ⁴ I _15/2跃迁，分别。用Er ³⁺的能态图描述了光致发光发射带的能量转移机制离子和异烟酸分子。化合物1具有绿色区域中 0.1479 和 0.4321 的 CIE (Commission Internationale de I'Éclairage) 色度坐标的特征。化合物1显示出 2.39 eV 的宽光学带隙。