A series of brucite structure-doped samples with different amounts of Er(III) have been synthesized by hydrothermal method. Various characterizations have been employed to study the composition, structure, and photoluminescence. Results suggested that the Er³⁺-doped samples with Mg(II)/Er(III) molar ratio of 0.99/0.01~0.8/0.2 exhibited typical brucite structure, and the sample with Mg(II)/Er(III) molar ratio of 0.7/0.3 represented layered double hydroxide (LDH) structure. Moreover, the crystallinity of the Er³⁺-doped samples tended to be poorer with the increasing amount of Er(III). Various strong emissions ranging from red to infrared emissions appear in the down-conversion photoluminescent spectra of the Er³⁺-doped samples excited by different wavelengths, and the energy of emission peaks has linear dependence on the energy of the excitation wavelength at 450~565 nm. Photoluminescent decay spectra show that the decaying behavior of the red and infrared emissions for the Er³⁺-doped samples are different from that of the previous Er³⁺-doped materials, and the lifetimes of the red and infrared emissions are less than that of the other Er³⁺-doped materials. Based on the present results as well as relevant references, the energy transition diagrams of the Er(III) incorporated in the samples were described, and the transition mechanisms of the red and infrared emissions have been proposed. The new Er³⁺-doped materials may be a latent fluorescent material applied in NIR detector or biomedical imaging in view of its strong red and infrared emissions as well as less toxicity for organisms.

通过水热法合成了一系列掺有不同Er（III）含量的水镁石结构样品。已经采用了各种表征来研究组成，结构和光致发光。结果表明，Mg（II）/ Er（III）摩尔比为0.99 / 0.01〜0.8 / 0.2的Er ³⁺掺杂样品表现出典型的水镁石结构，Mg（II）/ Er（III）摩尔比的样品具有典型的水镁石结构。 0.7 / 0.3的α表示层状双氢氧化物（LDH）结构。而且，随着Er（III）的量增加，掺杂Er ^3+的样品的结晶度趋于变差。Er ³⁺的下转换光致发光光谱中出现了从红色到红外发射的各种强发射。掺杂样品受不同波长的激发，发射峰的能量与激发波长在450〜565 nm的能量线性相关。光致发光衰减光谱表明，掺Er ^3+的样品的红色和红外发射的衰变行为与以前的掺Er ^3+的材料的衰变行为不同，并且红色和红外发射的寿命小于Er ³⁺的寿命。其他掺Er ^3+的材料。根据目前的结果和相关参考文献，描述了掺入样品中的Er（III）的能量跃迁图，并提出了红色和红外发射的跃迁机理。新版Er ³⁺鉴于其强烈的红色和红外发射以及对生物的毒性较小，掺杂的材料可能是应用于NIR检测器或生物医学成像的潜在荧光材料。