A novel green phosphor,Sr2MgB2O6：Tb3＋,Li＋ for white light-emitting diodes was prepared by solid-state reactions,and its structure and luminescence properties were investigated.The excitation and emission spectra in...A novel green phosphor,Sr2MgB2O6：Tb3＋,Li＋ for white light-emitting diodes was prepared by solid-state reactions,and its structure and luminescence properties were investigated.The excitation and emission spectra indicated that this as-prepared phosphor could be effectively excited by ultraviolet 368 nm,and exhibited bright green emission centered at 545 nm corresponding to the^5D_4→~7F_5 transition.9 mol.%of Tb^（3＋） was shown to be optimal.Good green emissions with the CIE chromaticity coordinates（0.262,0.583） could be achieved.Furthermore,the integrated emission intensity of Sr_2MgB_2O_6：0.09Tb^（3＋）,0.09Li~＋ phosphor decreased continuously to 72.1%at 300 ℃ with increasing temperature,and the activation energy of thermal quenching（E_a） was calculated to be0.175 eV,moreover,the quantum yield excited by 368 nm was measured as 11.1%.A green emission LED was made by coating Sr_2MgB_2O_6：0.09Tb^（3＋）,0.09Li~＋ phosphor on a NUV（365-370 nm） chip.Our results showed that Sr_2MgB_2O_6：Tb^（3＋）,Li~＋ is a kind of potential green-emitting phosphor and features good thermal stability.展开更多
基金supported by Natural Science Foundation of Fujian Province(2014J01209)Fujian Provincial Department of Science&Technology(2015H0036)the President Fund of Xiamen University(20720160087)
文摘A novel green phosphor,Sr2MgB2O6：Tb3＋,Li＋ for white light-emitting diodes was prepared by solid-state reactions,and its structure and luminescence properties were investigated.The excitation and emission spectra indicated that this as-prepared phosphor could be effectively excited by ultraviolet 368 nm,and exhibited bright green emission centered at 545 nm corresponding to the^5D_4→~7F_5 transition.9 mol.%of Tb^（3＋） was shown to be optimal.Good green emissions with the CIE chromaticity coordinates（0.262,0.583） could be achieved.Furthermore,the integrated emission intensity of Sr_2MgB_2O_6：0.09Tb^（3＋）,0.09Li~＋ phosphor decreased continuously to 72.1%at 300 ℃ with increasing temperature,and the activation energy of thermal quenching（E_a） was calculated to be0.175 eV,moreover,the quantum yield excited by 368 nm was measured as 11.1%.A green emission LED was made by coating Sr_2MgB_2O_6：0.09Tb^（3＋）,0.09Li~＋ phosphor on a NUV（365-370 nm） chip.Our results showed that Sr_2MgB_2O_6：Tb^（3＋）,Li~＋ is a kind of potential green-emitting phosphor and features good thermal stability.
