【摘 要】
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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 peop
【机 构】
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Engineering Research Center of Nano-Geomaterials of Ministry of Education,Faculty of Materials Scien
论文部分内容阅读
Phosphor-converted white-light-emitting diodes (pc-WLED) have been extensively employed as solid-state lighting sources,which have a very important role in peoples 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 inteal quantum efficiency (IQE) exceeds 88%,and the exteal 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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