Li Huaiyong, Pu Xipeng, Yao Shujuan, Wang Xiaoqing, Noh Hyeon Mi, Jeong Jung Hyun
J Nanosci Nanotechnol. 2016 Apr;16(4):3636-40. doi: 10.1166/jnn.2016.11871.
Y6MoO12 doped with Eu3+ was synthesized using a citrate-complexation route, and was calcined at 800 °C and 1400 °C, respectively. The structure, morphology and photoluminescence (PL) properties of the samples, and their dependence on the crystallite size were investigated. XRD patterns indicate that the Y6MoO12:Eu3+ powder was obtained at both calcination temperatures, and had a cubic structure. The results also suggest that Y6MoO12:Eu3+ calcined at 800 °C was in the nanocrystalline phase, which was confirmed by the SEM microimage. The crystalline size was about 140 nm. Both phosphors could be excited via three channels: f-f excitation of Eu3+ by blue light, MoO groups excitation by near-UV light, and charge transfer state excitation of Eu3+ by UV light. Both samples yielded red light emissions dominated by the 5D0-7F2 transition at 613 nm. The excitation efficient of the three channels depended on the calcination temperature. The energy transfer from the MoO groups to the Eu3+ ions was more effective in the nanocrystalline phase. The temporal decay feature of the phosphor was also characterized.
采用柠檬酸盐络合法合成了掺杂Eu3+的Y6MoO12，并分别在800℃和1400℃下进行煅烧。研究了样品的结构、形貌和光致发光（PL）性能及其对微晶尺寸的依赖性。XRD图谱表明，在两个煅烧温度下均获得了Y6MoO12:Eu3+粉末，且具有立方结构。结果还表明，800℃煅烧的Y6MoO12:Eu3+处于纳米晶相，这通过SEM微观图像得到了证实。晶体尺寸约为140nm。两种荧光粉都可以通过三个通道被激发：蓝光对Eu3+的f-f激发、近紫外光对MoO基团的激发以及紫外光对Eu3+的电荷转移态激发。两种样品均产生以613nm处的5D0-7F2跃迁为主的红光发射。三个通道的激发效率取决于煅烧温度。在纳米晶相中，从MoO基团到Eu3+离子的能量转移更有效。还对荧光粉的时间衰减特性进行了表征。
