Abstract：
This study investigates the synthesis and characterization of KSrVO4 phosphors doped with Er3+ ions using combustion synthesis route by using urea as a fuel. X-ray diffraction analysis confirmed the orthorhombic phase and nano-scale crystallite size of around 21 nm, while transmission electron microscopy showed spherical and rod-shaped morphologies. The studies detected upconversion emission spectra at 526, 542 and 643 nm, representing green and red transitions under 980 nm excitation. Downshifting emissions under 350 nm excitation revealed peaks at 492, 544 and 680 nm. The critical quenching concentration was 2.5 mol%, resulting from dipole-quadrupole interactions among dopant ions. The direct and indirect optical band gaps were calculated as 3.61 and 3.41 eV, respectively. The calculated chromaticity coordinates and color correlated temperature values of the phosphor surpassed 5000 K, suggesting its viability for cool LED applications. These findings emphasize KSrVO4:Er3+ as a promising greenish component in white LEDs and a potent upconverting luminescence material for bio-imaging and photovoltaics.
摘要：
本研究以尿素为燃料，采用燃烧合成路线研究了掺杂Er3离子的KSrVO4荧光粉的合成和表征。X射线衍射分析证实正交相和纳米级微晶尺寸约为21nm，透射电子显微镜显示球形和杆状形貌。研究检测到526、542和643nm的上转换发射光谱，代表980nm激发下的绿色和红色跃迁。在350nm激发下的下移发射显示在492、544和680nm处的峰。临界淬火浓度为2.5mol%，由掺杂剂离子之间的偶极-四极相互作用产生。直接和间接光学带隙分别计算为3.61和3.41eV，分别。计算得到的荧光粉色度坐标和颜色相关温度值超过5000K,这表明了它在很酷的LED应用中的可行性。这些发现强调KSrVO4:Er3+是白光LED中一种有前途的绿色成分，也是用于生物成像和光伏的有效上转换发光材料。
