Song Siyuan, Si Jiayong, Zhang Jing, Cai Gemei
College of Mechanical & Electrical Engineering, Central South University of Forestry & Technology Changsha Hunan 410004 P. R. China
School of Materials Science and Engineering, Central South University Changsha Hunan 410083 P. R. China
RSC Adv. 2019 Jan 9;9(2):1029-1035. doi: 10.1039/c8ra09735f. eCollection 2019 Jan 2.
The borate BaInBO (BIBO) is a promising host material for phosphors. A series of Tb and Eu codoped BaInBO phosphors were synthesized. Based on the Rietveld method, structure refinement of the codoped BIBO phosphor was carried out. Then, the luminescence properties of BIBO:Tb, Eu phosphors were extensively investigated under ultraviolet (UV) and vacuum ultraviolet (VUV) excitation. The measured PL spectra and decay times evidenced that energy transfer occurs between the Tb and Eu ions. The energy-transfer mechanism from Tb to Eu in BaInBO is dominated by electric multipolar interactions, with the critical distance calculated to be 10.97 Å. The temperature sensitivity of the Tb and Eu codoped sample under VUV was also investigated at the low temperature range from 25 K to 298 K. The emission color could be tuned from green to the red region by adjusting the concentration of codoped ions. The results indicate that the BIBO-based phosphors are valuable candidates for applications in the display and lighting fields.
硼酸盐BaInBO（BIBO）是一种很有前途的磷光体基质材料。合成了一系列Tb和Eu共掺杂的BaInBO磷光体。基于Rietveld方法，对共掺杂的BIBO磷光体进行了结构精修。然后，在紫外（UV）和真空紫外（VUV）激发下，对BIBO:Tb, Eu磷光体的发光性能进行了广泛研究。测得的PL光谱和衰减时间证明了Tb和Eu离子之间发生了能量转移。BaInBO中从Tb到Eu的能量转移机制主要由电多极相互作用主导，计算得出的临界距离为10.97 Å。还在25 K至298 K的低温范围内研究了Tb和Eu共掺杂样品在VUV下的温度敏感性。通过调整共掺杂离子的浓度，可以将发射颜色从绿色调节到红色区域。结果表明，基于BIBO的磷光体是显示和照明领域应用的有价值候选材料。
