title: Luminescence and energy-transfer properties of color-tunable Ca2Mg0.25Al1.5Si1.25O7:Ce(3+)/Eu(2+)/Tb(3+) phosphors for ultraviolet light-emitting diodes.
abstract: A series of Ca2Mg0.25Al1.5Si1.25O7:Ce(3+)/Eu(2+)/Tb(3+) phosphors was been prepared via a conventional high temperature solid-state reaction and their luminescence properties were studied. The emission spectra of Ca2Mg0.25Al1.5Si1.25O7:Ce(3+),Eu(2+) and Ca2Mg0.25Al1.5Si1.25O7:Ce(3+),Tb(3+) phosphors show not only a band due to Ce(3+) ions (409 nm) but also as a band due to Eu(2+) (520 nm) and Tb(3+) (542 nm) ions. More importantly, the effective energy transfer from Ce(3+) to Eu(2+) and Tb(3+) ions was confirmed and investigated by emission/excitation spectra and luminescent decay behaviors. Furthermore, the energy level scheme and energy transfer mechanism were investigated and were demonstrated to be of resonant type via dipole-dipole (Ce(3+) to Eu(2+)) and dipole-quadrupole (Ce(3+) to Tb(3+)) reactions, respectively. Under excitation at 350 nm, the emitting color could be changed from blue to green by adjusting the relative doping concentration of Ce(3+) and Eu(2+) ions as well as Ce(3+) and Tb(3+) ions. The above results indicate that Ca2Mg0.25Al1.5Si1.25O7:Ce(3+),Eu(2+)/Tb(3+) are promising single-phase blue-to-green phosphors for application in phosphor conversion white-light-emitting diodes.
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Yuan
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Song
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Sheng
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
authors.forename: Keyan
authors.initials: K
authors.lastname: Zheng
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
authors.forename: Qisheng
authors.initials: Q
authors.lastname: Huo
authors.affiliation: College of Earth Sciences, Jilin University, Changchun, 130026, People's Republic of China.
authors.forename: Xuechun
authors.initials: X
authors.lastname: Xu
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zou
mesh_terms: D000535:Aluminum / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D002563:Cerium / Q000737:chemistry; D003116:Color; D004735:Energy Transfer; D005063:Europium / Q000737:chemistry; D049449:Luminescence; D008274:Magnesium / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D012825:Silicon / Q000737:chemistry; D013725:Terbium / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D013725:Terbium; D002563:Cerium; D005063:Europium; D000535:Aluminum; D008274:Magnesium; D010100:Oxygen; D002118:Calcium; D012825:Silicon
keywords: Ca2Mg0.25Al1.5Si1.25O7:Ce3+/Eu2+/Tb3+; WLED; color-tunable; energy transfer