Luminescence Enhancement in Eu3+, Sm3+ Co-Doped LiY(MoO4)(2) Nano-Phosphors by Sol-Gel Process

作者：Zhou Xianju^*; Wang Guangchuan; Zhou Tonghui; Zhou Kaining; Li Qingxu; Wang Zhongqing

来源：Journal of Nanoscience and Nanotechnology, 2014, 14(5): 3494-3498.

DOI：10.1166/jnn.2014.7970

• LiY0.95-x Eu0.05Smx(MoO4)(2)
• Red Phosphor
• White LEDs
• Energy Transfer

A series of LiY0.95-xEu0.05Smx(MoO4)(2) red light emitting phosphors were synthesized by sol-gel technique. The phase impurity and spectroscopic properties were characterized by X-ray Diffraction (XRD), Photo-Luminescence (PL) and Photo-Luminescence Excitation (PLE) spectra, respectively. It is found that the PLE spectra of the Eu3+, Sm3+ co-doped nanoparticles are enhanced and broadened as compared with the solely doped samples, which will make the co-doped phosphors match better with blue and/or UV GaN based LED chips. The red emission intensity of Eu3+ is largely enhanced by the energy transfer from Sm3+. The mechanism of the enhancement is clearly proven to be the increase in the quantum efficiency of D-5(0) state of Eu3+ rather than the increase in the absorption of Eu3+. Meanwhile, the characteristic f-f transitions of Sm3+ are greatly reduced, resulting in little influence in the color purity of the co-doped phosphors. The present material is an amendatory promising red light emitting phosphor for white LEDs.

• 出版日期2014-5
• 单位重庆邮电大学