摘要
Novel orange-red emitting Ba_2Ca_(1–x)Zn_2Si_6O_(17):x Sm^(3+)(0.02≤x≤0.08) phosphors were synthesized using conventional solid-state reaction method under air atmosphere. The phase formation of the samples was characterized by powder X-ray diffraction patterns. Scanning electron microscopy(SEM) and photoluminescence properties were also investigated. The narrow excitation and emission spectra indicated the typical 4f-4f transitions of Sm^(3+). The dominant excitation line was around 405 nm attributed to ~6H_(5/2)→ ~4F_(7/2) and the emission spectrum consisted of four emission peaks at 562, 600, 647, and 708 nm corresponding to the various transitions ~4G_(5/2) to ~6HJ(J=5/2, 7/2, 9/2 and 11/2) of the Sm^(3+) ions in the same order. The strongest emission band located at 600 nm was attributed to ~4G_(5/2)→~6H_(7/2) transition of Sm^(3+), producing bright orange-red color emission. The optimal dopant concentration of Sm3+ ion in Ba_2CaZn_2Si_6O_(17):x Sm^(3+) phosphor was around 4 mol.% and the critical transfer distance(Rc) of Sm^(3+) was calculated to be 2.65 nm. Decay time varied with the Sm^(3+) concentrations in Ba_2 CaZn_2Si_6O_(17) phosphors. In addition, the Commission International del'Eclairagethe(CIE) chromaticity coordinates of Ba_2Ca_(0.96)Zn_2Si_6O_(17):0.04Sm^(3+) phosphor was located in the orange-red region(0.547, 0.450) and the correlated color temperature(CCT) was 2543 K. The present results indicated that Sm^(3+) activated Ba_2CaZn_2Si_6O_(17) phosphors may be used as an orange-red emitting phosphor for near-ultraviolet(n-UV) based white light emitting diodes(WLEDs) applications.
Novel orange-red emitting Ba_2Ca_(1–x)Zn_2Si_6O_(17):x Sm^(3+)(0.02≤x≤0.08) phosphors were synthesized using conventional solid-state reaction method under air atmosphere. The phase formation of the samples was characterized by powder X-ray diffraction patterns. Scanning electron microscopy(SEM) and photoluminescence properties were also investigated. The narrow excitation and emission spectra indicated the typical 4f-4f transitions of Sm^(3+). The dominant excitation line was around 405 nm attributed to ~6H_(5/2)→ ~4F_(7/2) and the emission spectrum consisted of four emission peaks at 562, 600, 647, and 708 nm corresponding to the various transitions ~4G_(5/2) to ~6HJ(J=5/2, 7/2, 9/2 and 11/2) of the Sm^(3+) ions in the same order. The strongest emission band located at 600 nm was attributed to ~4G_(5/2)→~6H_(7/2) transition of Sm^(3+), producing bright orange-red color emission. The optimal dopant concentration of Sm3+ ion in Ba_2CaZn_2Si_6O_(17):x Sm^(3+) phosphor was around 4 mol.% and the critical transfer distance(Rc) of Sm^(3+) was calculated to be 2.65 nm. Decay time varied with the Sm^(3+) concentrations in Ba_2 CaZn_2Si_6O_(17) phosphors. In addition, the Commission International del'Eclairagethe(CIE) chromaticity coordinates of Ba_2Ca_(0.96)Zn_2Si_6O_(17):0.04Sm^(3+) phosphor was located in the orange-red region(0.547, 0.450) and the correlated color temperature(CCT) was 2543 K. The present results indicated that Sm^(3+) activated Ba_2CaZn_2Si_6O_(17) phosphors may be used as an orange-red emitting phosphor for near-ultraviolet(n-UV) based white light emitting diodes(WLEDs) applications.