title: Luminescence enhancement in Eu3+, Sm3+ co-doped liy(MoO4)2 nano-phosphors by sol-gel process.
abstract: A series of LiY(0.95-x)Eu(0.05)Sm(x)(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 5D0 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.
authors.forename: Xianju
authors.initials: X
authors.lastname: Zhou
authors.forename: Guangchuan
authors.initials: G
authors.lastname: Wang
authors.forename: Tonghui
authors.initials: T
authors.lastname: Zhou
authors.forename: Kaining
authors.initials: K
authors.lastname: Zhou
authors.forename: Qingxu
authors.initials: Q
authors.lastname: Li
authors.forename: Zhongqing
authors.initials: Z
authors.lastname: Wang