Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 8, Issue -, Pages -Publisher
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/s41377-019-0126-1
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Funding
- National Natural Science Foundation of China [51672259, 51720105015, 51672265, 21521092, 51750110511, 21872174]
- Key Research Program of Frontier Sciences of CAS [YZDY-SSW-JSC018]
- CAS-Croucher Funding Scheme for Joint Laboratories [CAS18204]
- Scientific and Technological Department of Jilin Province [20170414003GH]
- Project of Innovation-Driven Plan in Central South University [2017CX003]
- State Key Laboratory of Powder Metallurgy in Central South University
- Thousand Youth Talents Plan of China
- Hundred Youth Talents Program of Hunan
- Shenzhen Science and Technology Innovation Project (630)
- Jiangmen Innovative Research Team Program (2017)
- Major program of basic research and applied research of Guangdong Province [2017KZDXM083]
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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 La4GeO8:Bi3+ 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, Bi3+ ions randomly occupy all La sites in orthorhombic La4GeO8. Importantly, the oxygen-vacancy-induced electronic localization around the Bi3+ 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 Bi3+ ions.
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