A Novel Tunable Green- to Yellow-Emitting β-YFS:Ce3+ Phosphor for Solid-State Lighting
Authors:
- Teng-Ming ChenTCTeng-Ming Chen
- Chi-Shen LeeCLChi-Shen Lee
- Kuo-Ju ChenKCKuo-Ju Chen
- Hao-Chung KuoHKHao-Chung Kuo
- 18 July 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 3 (8) , 3195-3199
Abstract
A Ce3+-activated fluorosulfide phosphor (β-YFS:Ce3+) 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 Ce3+ ions occupied. The emission band with a maximum at 495 nm of β-Y0.99Ce0.01FS phosphor was characterized by the 4f-5d transitions of Ce3+ ion. With increasing Ce3+ concentration, the emission variations were observed from 495 to 547 nm. When β-YFS:Ce3+ 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:Ce3+ 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.Keywords
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