Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440817 | Journal of the European Ceramic Society | 2016 | 9 Pages |
Abstract
Transparent Ce3+:Lu3Al5O12 ceramics were successfully fabricated by combining tape-casting method and direct-forming method with solid-state sintering. The in-line optical transmittance and absorption spectra of as-sintered and air-annealed Ce:LuAG ceramics were comparely studied. XPS spectra indicated Ce3+ and Ce4+ ions co-existed in the prepared ceramics. Energy levels splitting of Ce3+ in LuAG hosts were investigated based on broad-band emission from 500Â nm to 700Â nm resulting from the electron transitions from 5d1 excited levels (2D) to 4f ground state of Ce3+ (2F5/2, 2F7/2). The fluorescence lifetimes at 540Â nm were 50-60Â ns and energy resolution of 12% was achieved at 22Na (511Â keV). When collaborated with InGaN-GaN LED chips, a maximum CRI of 55.8 with LE as high as 223.4Â lm/W were demonstrated, indicating that Ce:LuAG ceramics had a promising potential for white light-emitting diodes.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Chaoyang Ma, Fei Tang, Jinda Chen, Ran Ma, Xuanyi Yuan, Zicheng Wen, Jiaqi Long, Junting Li, Miaomiao Du, Jiantao Zhang, Yongge Cao,