Hydrothermal synthesis of NaLa(WO4)(2): Eu3+ octahedrons and tunable luminescence by changing Eu3+ concentration and excitation wavelength

作者：Tang, Yanxia; Ye, Yongfei; Liu, Haihui; Guo, Xiongfei; Tang, Hongxia^*; Yin, Wenzhong; Gao, Yaping

来源：Journal of Materials Science: Materials in Electronics , 2017, 28(2): 1301-1306.

DOI：10.1007/s10854-016-5659-y

• ENERGY-TRANSFER
• PHOTOLUMINESCENT PROPERTIES
• CONTROLLABLE SYNTHESIS
• UP-CONVERSION
• PHOSPHORS
• BEHAVIOR

NaLa(WO4)(2): Eu3+ phosphors with different Eu3+ concentrations have been synthesized by a hydrothermal method. The phase is confirmed by XRD analysis, which shows a pure-phase NaLa(WO4)(2) XRD pattern for all of NaLa(WO4)(2): Eu3+ phosphors. The SEM and TEM images indicate that all of NaLa(WO4)(2): Eu3+ phosphors have a octahedral morphology. These suggest that the Eu3+ doping has no influence on the structure and growth of NaLa(WO4)(4) particles. By monitoring the emission of Eu3+ at 615 nm, NaLa(WO4)(2): Eu3+ phosphors show excitation bands originating from both host and Eu3+ ions. Under the excitation at 271 nm corresponding to WO4 2-groups, emission bands coming from the (1)A(1) -> T-3(1) transition with the WO42- groups and the D-5(0) -> F-7(j) (j = 0, 1, 2, 3 and 4) transitions of Eu3+ are observed. The emission intensity relating to WO42- goups decreases with increasing Eu3+ concentration. But emission intensities of Eu3+ increase firstly and then decreases because of concentration quenching effect. Under the excitation at 395 nm corresponding to F-7(0) -> L-5(6) transition of Eu3+, only characteristic Eu3+ emission bands can be observed. The results of this work suggest that tunable luminescence can be obtained for Eu3+ doped NaLa(WO4)(2)phosphors by changing Eu3+ concentration and excitation wavelength.

• 出版日期2017-1
• 单位河北北方学院