Tunable photoluminescence and site occupancy of activators Ce3+ in novel phosphors Ca3(1-x)ZrSi2O9:3xCe(3+)
Tunable photoluminescence and site occupancy of activators Ce3+ in novel phosphors Ca3(1-x)ZrSi2O9:3xCe(3+)
复制标题
新型荧光粉 Ca3(1-x)ZrSi2O9:3xCe(3 ) 中激活剂 Ce3 的可调光致发光和位点占用
DOI：
10.1007/s00339-018-2184-2
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发表时间：
2018
影响因子：
2.7
通讯作者：
Liu Qian
中科院分区：
文献类型：
--
作者：
Zhou Zhenzhen;Ni Jia;Liu Wanlu;Liu Qian
在空气气氛中用固相反应法制备了Ce3+激活的新型蓝色荧光粉Ca3(1−x)ZrSi2O9：3xCe。在Ca3(1−x)ZrSi2O9：3xCe中观察到两组独立的光致发光光谱。在这两组光谱中，激发和发射带的最大值分别位于约324,370 nm(记为“ex：324，EM：370”)和358,410 nm(记为“ex：358，EM：410”)。通过对Ca3(1−x)ZrSi2O9：3xCe的晶体结构和光致发光光谱的分析，可以得出结论：“ex：324，EM：370”是由Ce3+(1，3)离子占据Ca2+(1)和Ca2+(3)位引起的，而“ex：358，EM：410”是由于Ce3+(2)离子占据了Ca2+(2)位。此外，Ca3(1−x)ZrSi2O9：3xCe的发射带是可调的，发射峰随激发波长和Ce3+掺杂浓度的增加而红移。在Ca3(1−x)ZrSi2O9：3xCe荧光粉中，Ce~(3+)离子的衰减时间很短，只有几十纳秒。此外，Ca3(1−x)ZrSi2O9：3xCe(x= 0.02)的光致发光热稳定性较好，特别是在324C激发下，100C时的相对发射强度仍约为室温下初始值的91%。因此，Ca3(1−x)ZrSi2O9：3xCe是一种很有前途的蓝色发光材料，在紫外光激发白光发光二极管(WLED)、农业和其他光子领域具有潜在的应用前景。
The novel Ce3+-activated blue-emitting phosphors Ca3(1−x)ZrSi2O9:3xCe were successfully obtained by solid-state reaction method in the air atmosphere. Two sets of individual photoluminescence spectra were observed in Ca3(1−x)ZrSi2O9:3xCe. In the two sets of spectra, the maximums of excitation and emission bands locate at about 324, 370 nm (denoted as spectra “EX:324, EM:370”) and 358, 410 nm (denoted as spectra “EX:358, EM:410”), respectively. By analyzing the crystal structure and photoluminescence spectra of Ca3(1−x)ZrSi2O9:3xCe, it can be concluded that the spectra “EX:324, EM:370” originated from Ce3+(1,3) ions occupying Ca2+(1) and Ca2+(3) sites, and the spectra “EX:358, EM:410” are due to Ce3+(2) ions occupying Ca2+(2) sites. Further, the emission band of Ca3(1−x)ZrSi2O9:3xCe is tunable, and the emission peaks red shift with the increase of excitation wavelength and Ce3+doping concentration. The decay times of Ce3+ions in Ca3(1−x)ZrSi2O9:3xCe phosphors are short in tens of nanoseconds. Moreover, the photoluminescence thermal stability of Ca3(1−x)ZrSi2O9:3xCe (x= 0.02) is acceptable, especially under the 324 nm excitation, and the relative emission intensity at 100 °C remains to be about 91% of the initial value at room temperature. Thus, Ca3(1−x)ZrSi2O9:3xCe is a kind of promising blue-emitting phosphors that can be potentially used in ultraviolet excited white light-emitting diodes (WLEDs), agriculture and other photonic fields.