摘要
研究了SrB4O7:Pr3+,LaB3O6:Pr3+及LaMgB5O10:Pr3+低温下的光谱．从发射谱上看这三种发光材料都可以产生光子级联发射,对照Pr3+离子的能级图对各发射峰进行了指认．因为硼酸盐体系中较高的声子振动能量导致了3P0和1D2能级间的无辐射弛豫,所以级联发射的第二步过程3P0→3HJ发光非常微弱或基本没有．在LaB3O6及LaMgB5O10的激发谱上除了4f5d吸收带外还观测到了Pr3+离子的3H4→1S0跃迁,由此在这两种材料中确定了Pr3+离子的1S0能级相对于最低的4f5d能级的位置．
Low temperature spectra of SrB4O7：Pr^3＋, LaB3O6：Pr^3＋ and LaMgBsO10：Pr^3＋ were investigated by synchrotron radiation VUV light. Under VUV excitation, photon cascade emission was found in SrB4O7：Pr^3＋, LaB3O6：Pr^3＋ and LaMgB5O10：Pr^3＋. All peaks in emission spectra were assigned. Because high phonon energy in borates results in non-radiative relaxation between ^3P0 and ^1D2 states of Pr^3＋, the second step emission ^3P0 → ^3Hj is very low in SrB4O7：Pr^3＋ and even is absent in LaB3O6：Pr^3＋ and LaMgB5O10：Pr^3＋. In the excitation spectra of LaB3O6：Pr^3＋ and LaMgB5O10：Pr^3＋, along with the 4f5d absorption bands, a weak line due to ^3H4 → ^1S0 transition also was detected. From the position of ^3H4 → ^1S0 transition, the energy difference of ^1S0 state and the lowest 4f5d state was determined.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期373-376,共4页
Journal of Inorganic Materials
基金
国家自然科学基金(10575099
90201019)
