1.Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, 430074, Wuhan, People's Republic of China
2.State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, People's Republic of China
3.Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, 410083, Changsha, Hunan, People's Republic of China
4.State Key Laboratory of Powder Metallurgy, Central South University, 932 South Lushan Road, 410083, Changsha, Hunan, People's Republic of China
5.Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, NSW, Australia
6.School of Applied Physics and Materials, Wuyi University, 529020, Jiangmen, Guangdong, People's Republic of China
Jun Lin (1057965688@qq.com)
纸质出版日期:2019,
网络出版日期:2019-01-30,
收稿日期:2018-10-13,
修回日期:2018-12-13,
录用日期:2018-12-14
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New strategy for designing orangish-red-emitting phosphor via oxygen-vacancy-induced electronic localization[J]. LSA, 2019,8(1):136-144.
Wei, Y. et al. New strategy for designing orangish-redemitting phosphor via oxygen-vacancyinduced electronic localization. Light: Science & Applications, 8, 136-144 (2019).
New strategy for designing orangish-red-emitting phosphor via oxygen-vacancy-induced electronic localization[J]. LSA, 2019,8(1):136-144. DOI: 10.1038/s41377-019-0126-1.
Wei, Y. et al. New strategy for designing orangish-redemitting phosphor via oxygen-vacancyinduced electronic localization. Light: Science & Applications, 8, 136-144 (2019). DOI: 10.1038/s41377-019-0126-1.
Phosphor-converted white-light-emitting diodes (pc-WLED) have been extensively employed as solid-state lighting sources
which have a very important role in people's daily lives. However
due to the scarcity of the red component
it is difficult to realize warm white light efficiently. Hence
red-emitting phosphors are urgently required for improving the illumination quality. In this work
we develop a novel orangish-red La
4
GeO
8
:Bi
3+
phosphor
the emission peak of which is located at 600 nm under near-ultraviolet (n-UV) light excitation. The full width at half maximum (fwhm) is 103 nm
the internal quantum efficiency (IQE) exceeds 88%
and the external quantum efficiency (EQE) is 69%. According to Rietveld refinement analysis and density functional theory (DFT) calculations
Bi
3+
ions randomly occupy all La sites in orthorhombic La
4
GeO
8
. Importantly
the
oxygen-vacancy-induced electronic localization around the Bi
3+
ions is the main reason for the highly efficient orangish-red luminescence. These results provide a new perspective and insight from the local electron structure for designing inorganic phosphor materials that realize the unique luminescence performance of Bi
3+
ions.
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