title: A novel tunable green- to yellow-emitting β-YFS:Ce³+ phosphor for solid-state lighting.
abstract: A Ce(3+)-activated fluorosulfide phosphor (β-YFS:Ce(3+)) was synthesized by solid-state reaction in a sealed tube. The crystal structure has been refined from the XRD profiles and there are two different crystallographic rare earth sites, namely, Y(1) and Y(2), where the Ce(3+) ions occupied. The emission band with a maximum at 495 nm of β-Y(0.99)Ce(0.01)FS phosphor was characterized by the 4f-5d transitions of Ce(3+) ion. With increasing Ce(3+) concentration, the emission variations were observed from 495 to 547 nm. When β-YFS:Ce(3+) phosphors were utilized to incorporate with n-UV/blue chip, greenish-white light with color rendering index of 65-77 were obtained. The results indicate that the tunable green- to yellow-emitting β-YFS:Ce(3+) can serve as a potential phosphor for incorporation in fabrication for solid-state lighting. The preparation, spectroscopic characterization, quantum efficiency, thermal-quenching behavior, and related LED device data are also presented.
authors: Phosphors Research Laboratory, Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan.
authors: Yun-Chen
authors: YC
authors: Wu
authors: De-Yin
authors: DY
authors: Wang
authors: Teng-Ming
authors: TM
authors: Chen
authors: Chi-Shen
authors: CS
authors: Lee
authors: Kuo-Ju
authors: KJ
authors: Chen
authors: Hao-Chung
authors: HC
authors: Kuo
mesh_terms: D002563:Cerium / Q000737:chemistry*; D003116:Color; D008029:Lighting; D011789:Quantum Theory; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D014466:Ultraviolet Rays
chemical_list: D013440:Sulfides; D002563:Cerium