Institute of Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania.
Wood Science and Engineering, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Forskargatan 1, 931 87, Skellefteå, Sweden.
Sci Rep. 2022 May 3;12(1):7116. doi: 10.1038/s41598-022-11337-y.
In the present work, three different Mn-doped calcium pyrophosphate (CPP, CaPO) polymorphs were synthesized by wet co-precipitation method followed by annealing at different temperatures. The crystal structure and purity were studied by powder X-ray diffraction (XRD), Fourier-transform infrared (FTIR), solid-state nuclear magnetic resonance (SS-NMR), and electron paramagnetic resonance (EPR) spectroscopies. Scanning electron microscopy (SEM) was used to investigate the morphological features of the synthesized products. Optical properties were investigated using photoluminescence measurements. Excitation spectra, emission spectra, and photoluminescence decay curves of the samples were studied. All Mn-doped polymorphs exhibited a broadband emission ranging from approximately 500 to 730 nm. The emission maximum was host-dependent and centered at around 580, 570, and 595 nm for γ-, β-, and α-CPP, respectively.
在本工作中，通过湿共沉淀法合成了三种不同的掺锰焦磷酸钙（CPP，CaPO）多晶型物，然后在不同温度下退火。通过粉末 X 射线衍射（XRD）、傅里叶变换红外（FTIR）、固态核磁共振（SS-NMR）和电子顺磁共振（EPR）光谱研究了晶体结构和纯度。扫描电子显微镜（SEM）用于研究合成产物的形态特征。使用光致发光测量研究了光学性质。研究了样品的激发光谱、发射光谱和光致发光衰减曲线。所有掺锰多晶型物都表现出从大约 500 到 730nm 的宽带发射。发射最大值与主体有关，分别位于 γ-、β-和 α-CPP 的约 580、570 和 595nm 处。
