Ba_2Gd_2Si_4O_(13)∶Dy^(3+)的能量传递和热稳定性研究

Study on the Energy Transfer and Thermal Stability of Ba_2Gd_2Si_4O_(13)∶Dy^(3+)

利用高温固相反应合成了Ba2Gd2Si4O13∶Dy3+荧光粉,从激发光谱、发射光谱、衰减寿命3个方面详细研究了不同激发波长下Gd3+→Dy3+的能量传递和热稳定性能。研究表明,由于Ba2Gd2Si4O13基质中Gd3+→Dy3+的能量传递,Dy3+在274nm激发的发光强度是在349nm激发的5倍;Ba2Gd2Si4O13∶Dy3+荧光粉表现出较好的热稳定性,在250℃的发光强度为常温的85%;随着加热温度的升高,兰光比黄光强度下降更多,而Gd3+发光有所增加。Ba2Gd2Si4O13∶Dy3+荧光粉可作为潜在的单一基质单一掺杂发光材料。

The Ba2Gd2 Sh O13 ∶ Dy^3＋ phosphors were prepared by a solid-state reaction method.The Gd^3＋→ Dy^3＋ energy transfer and thermal stability of Ba2 Gd2 Si4 O13 ∶ Dy^3＋ under the different wavelength excitation were investigated detailedly according to the excitation spectra,emission spectra and decay lifetime.The results suggest that the Dy^3＋ luminous intensity under the 274 nm excitation is 5 times of that under the 349 nm excitation due to the Gd^3＋→Dy^3＋ energy transfer.Moreover,Ba2 Gd2 Si4O13 ∶ Dy^3＋ phosphors possess better thermal stability.The luminous intensity of Ba2Gd2Si4O13 ∶ Dy^3＋ at 250 ℃ is 85% of that at room temperature.The blue is decreased much more than the yellow for the Dy^3＋ ions,however,the emission intensity of Gd^3＋ ions is increased slightly with increasing the temperature Therefore,Ba2Gd2Si4O13 ∶ Dy^3＋ can be used as potential single-doped and single-composition phosphors.