Journal
JOURNAL OF LUMINESCENCE
Volume 194, Issue -, Pages 179-184Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2017.10.035
Keywords
Ceramics; Defects; Luminescence; Oxidation
Categories
Funding
- Natural Science Foundation of Fujian Province [2016J01752]
- Fujian Education Department Projects [JA15537, JK2015057]
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The Mn4+, Zn2+: Li(2)TiO(3)red phosphors are synthesized through the high temperature solid state reaction method. The XRD, SEM, ICP, absorption spectra, excitation and emission spectra are described. The Zn2+ acts as the luminescence adjustment ion to enhance the red emission efficiency. The phosphors have the crystal structure consisting of [TiO6] and [LiO6] octahedral sites and the Zn-O-Zn bonds. Concentration dependence on Zn2+ in Mn4+, Zn2+: Li2TiO3 is presented. Results indicate the suitable concentration of Zn2+ can enhance the emission efficiency. In the region of 682-697 nm when excited by 475 nm, the external quantum efficiency are obtained to be 18%, correlative with the transition of E-2(g) (T-2(1)) -> (4)A(2g) of Mn4+. The crystal field strength (Dq) and the Racah parameters (B and C) are estimated to evaluate the nephelauxetic effect of Mn4+. The white-LED performances and thermal stability are also presented.
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