title: LaOF:Eu3+ nanocrystals: hydrothermal synthesis, white and color-tuning emission properties.
abstract: Uniform LaOF and LaOF : Eu(3+) nanocrystals of the γ-form have been successfully synthesized under mild conditions via a facile hydrothermal method followed a heat treatment of their bastnaesite-type precursor (LaCO(3)F). The synthetic details, investigations into the phase purity and the presence of the oxocarbonate anion CO(3)(2-) proven by IR measurements and EDX, as well as X-ray powder diffraction data, are given. Photoluminescence (PL) and cathodoluminescence (CL) spectra were utilized to characterize the luminescence properties of the LaCO(3)F : Eu(3+) and LaOF : Eu(3+) samples. Under ultraviolet light excitation, the LaCO(3)F : Eu(3+) precursor shows an orange emission of Eu(3+) (dominated by (5)D(0)→(7)F(1)), while the product of heat treatment, LaOF : Eu(3+), shows the characteristic emissions of Eu(3+) ((5)D(J)→(7)F(J')J, J' = 0, 1, 2, 3 transitions). Under the excitation of UV and low-voltage electron beams, the emission color (including white) of LaOF : Eu(3+) can be tuned by adjusting the doping concentration of Eu(3+). The corresponding luminescence mechanisms have been discussed in detail.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P R China.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Shang
authors.forename: Guogang
authors.initials: G
authors.lastname: Li
authors.forename: Xiaojiao
authors.initials: X
authors.lastname: Kang
authors.forename: Dongmei
authors.initials: D
authors.lastname: Yang
authors.forename: Dongling
authors.initials: D
authors.lastname: Geng
authors.forename: Chong
authors.initials: C
authors.lastname: Peng
authors.forename: Ziyong
authors.initials: Z
authors.lastname: Cheng
authors.forename: Houzhou
authors.initials: H
authors.lastname: Lian
authors.forename: Jun
authors.initials: J
authors.lastname: Lin