A novel near-ultraviolet (NUV) converting blue-violet Ca2-xAlMg0.5Si1.5O7:xCe(3+) phosphor for white light-emitting-diodes (w-LEDs)

作者：Zhao, Cong; Zhu, Da-chuan^*; Tu, Ming-jing; Huang, Min; Peng, Ling-ling; Han, Tao

来源：RSC Advances, 2016, 6(3): 2368-2373.

DOI：10.1039/c5ra15032a

• ENERGY-TRANSFER PROPERTIES
• OPTICAL-PROPERTIES
• UV-LEDS
• LUMINESCENCE
• EU2+
• TEMPERATURE
• BI3+

Ce3+ doped aluminosilicate phosphors (Ca2-xAlMg0.5Si1.5O7:xCe(3+), x = 0.015-0.075) for white NUV w-LEDs were synthesized by a solid-state reaction method at 1250 degrees C. The as-prepared samples were characterized by XRD and fluorescence spectrophotometry; the obtained XRD results show that the target phase was synthesized and doping with Ce3+ did not result in an impurity phase. The as-prepared phosphors exhibit a strong blue-violet emission under the near-ultraviolet radiation excitation. Corresponding fitting results show the emission spectra contain two distinct single bands, which come from the transition of D-2(3/2) -> F-2(7/2) and F-2(5/2) of the Ce3+ ion. The colorimetric coordinates of the sample with x = 0.03 are (0.1574, 0.0359), located in the blue-violet region. In addition, the sample exhibits high external quantum efficiency (EQE = 37.3%) and excellent thermal stability (T-50 = 230 degrees C). We obtained bright blue-violet light by pumping the sample with NUV light (lambda = 365 nm), which suggests that this material has the potential for application as a NUV converting blue-violet phosphor for the NUV w-LEDs.

• 出版日期2016
• 单位重庆文理学院; 四川大学