College of Physics Science & Technology, Hebei Key Lab of Optic-Electronic Information and Materials, Hebei University, Baoding 071002, China.
Dalton Trans. 2018 Oct 9;47(39):13913-13925. doi: 10.1039/c8dt02780c.
A series of color-tunable NaBa1-zSrzB9O15:Ce3+,Mn2+ phosphors were synthesized by a high temperature solid state method. Luminescence property, energy transfer, thermal stability and cation substitution were investigated in detail. Due to energy transfer, NaBaB9O15:Ce3+,Mn2+ presents violet to green luminescence and manifest a broad excitation range from 200 to 350 nm. The energy transfer mechanism of Ce3+-Mn2+ is identified as a dipole-dipole interaction. NaBa1-zSrzB9O15:Ce3+,Mn2+ displays both Ce3+ violet and Mn2+ green and orange emissions under ultraviolet excitation. It is observed that Sr2+ partial substitution for Ba2+ could adjust the ratio of Mn2+ emission intensity in different cation sites, which results from preferred sites' occupation with modification of the crystal structure. Furthermore, increase in temperature can enhance the energy transfer from Ce3+ to Mn2+, which enhances the Mn2+ emission intensity sharply. The highly thermal-sensitive property of NaBa1-zSrzB9O15:Ce3+,Mn2+ makes it feasible for its potential application in luminescent ratiometric thermometers with wide temperature range.
通过高温固相法合成了一系列可调节颜色的 NaBa1-zSrzB9O15:Ce3+,Mn2+ 荧光粉。详细研究了其发光性能、能量传递、热稳定性和阳离子取代。由于能量传递，NaBaB9O15:Ce3+,Mn2+ 呈现出从紫色到绿色的发光，表现出从 200nm 到 350nm 的宽激发范围。Ce3+-Mn2+ 的能量传递机制被确定为偶极-偶极相互作用。NaBa1-zSrzB9O15:Ce3+,Mn2+ 在紫外光激发下同时显示 Ce3+ 的紫色、Mn2+的绿色和橙色发射。观察到 Sr2+部分取代 Ba2+ 可以调整不同阳离子位置处 Mn2+发射强度的比例，这是由于晶体结构的修饰导致了优先位置的占据。此外，温度的升高可以增强 Ce3+到 Mn2+的能量传递，从而使 Mn2+的发射强度急剧增强。NaBa1-zSrzB9O15:Ce3+,Mn2+ 的高温度敏感性使其在具有宽温度范围的发光比率温度计中的潜在应用成为可能。
