Chen Jian, Liu Yangai, Fang Minghao, Huang Zhaohui
School of Materials Science and Technology, China University of Geosciences (Beijing) , Beijing 100083, P. R. China.
Inorg Chem. 2014 Nov 3;53(21):11396-403. doi: 10.1021/ic501057r. Epub 2014 Oct 17.
A series of blue-to-white emitting Mg2Al4Si5O18: Eu(2+), Mn(2+) phosphors were synthesized via high-temperature solid-state method, and their luminescence properties were investigated in detail. Under near-ultraviolet (UV) light excitation of 365 nm, Eu(2+)-doped Mg2Al4Si5O18 exhibits a broad blue emission band peaked at 469 nm, and Mn(2+)-doped Mg2Al4Si5O18 shows a broad orange-red emission band near 600 nm. The energy transfer from Eu(2+) to Mn(2+) in Mg2Al4Si5O18 host matrix can be found, and the resonant type is demonstrated by a dipole-quadrupole mechanism. The emission hue can be tuned from blue (0.17, 0.17) to bluish green (0.22, 0.29) and finally to white (0.31, 0.33) by properly varying the ratio of Eu(2+)/Mn(2+). The thermal quenching property of the sample was investigated, and the activation energy ΔE was estimated to be 0.30 eV. Additionally, the energy transfer critical distance between Eu(2+) and Mn(2+) was calculated. With appropriate tuning of activator content, the Mg2Al4Si5O18: Eu(2+), Mn(2+) phosphor may have potential application for UV light-emitting diodes.
通过高温固态法合成了一系列蓝白发光的Mg2Al4Si5O18:Eu(2+),Mn(2+)荧光粉，并对其发光性能进行了详细研究。在365nm近紫外光激发下，Eu(2+)掺杂的Mg2Al4Si5O18呈现出以469nm为峰值的宽蓝光发射带，而Mn(2+)掺杂的Mg2Al4Si5O18在600nm附近显示出宽橙红光发射带。在Mg2Al4Si5O18基质中可发现从Eu(2+)到Mn(2+)的能量转移，且通过偶极-四极机制证明了其共振类型。通过适当改变Eu(2+)/Mn(2+)的比例，发射色调可从蓝色(0.17,0.17)调至蓝绿色(0.22,0.29)，最终调至白色(0.31,0.33)。研究了样品的热猝灭性能，估计激活能ΔE为0.30eV。此外，还计算了Eu(2+)和Mn(2+)之间的能量转移临界距离。通过适当调整激活剂含量，Mg2Al4Si5O18:Eu(2+),Mn(2+)荧光粉可能在紫外发光二极管方面具有潜在应用。
