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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (9): 1372-1375. 上一篇    下一篇

研究论文

SrB4O7:Pr^3+中Pr^3+的发光性质

杨智;林建华;苏勉曾;陶冶;王谓;李国宝;王宇飞;李永明   

  1. 云南师范大学化学系;北京大学稀土材料化学与应用国家重点实验室;中国科学 院高能物理研究所同步辐射实验室
  • 发布日期:2001-09-15

Luminescent property of Pr^3+ in BrB4O7

Yang Zhi;Lin Jianhua;Su Mianzeng;Tao Ye;Wang Wei;Li Guobao;Wang Yufei;Li Yongming   

  • Published:2001-09-15

PDF

342

被引次数

11

本研究报道Pr^3+在SrB4O7中的发光性质，在SrB4O7中Pr^3+离子的4f5d能态高于1^S0能级，因此，在207nmUV光激发下，Pr^3+能够把所吸收的一个高能量的UV光子转换为两个可见光子的发射(光子倍增)；在此氧化物基质中的光子倍增主要是由于阳离子处于弱的晶体场格位之中；由于与稀土离子弱联结相关的声子振动频率低(hωmax～1200cm^-1),因此还能观察到从3^P0能级向低能级的跃迁。第一个光子的发射由1^S0→1^G4(313nm),1^S0→1^D2(338nm)和1^S0→1^I6(405nm)的辐射跃迁组成；第二个光子的发射由3^P0和1^D2能级向低能级的辐射跃迁组成[3^P0→(3^HJ,3^FJ)和1^D2→(3^H4,3^H5)]。

关键词: 氧化锶, 氧化硼, 镨, 发光特性, 光子倍增

The luminescent property of Pr^3+ in SrB4O7 is reported. The energy level of Pr^3+ 4f5d in SrB4O7 lies above the 1^S0 state. so under UV light excitation at 207 nm, cascade emission of Pr^3+ occurs from the 1^S0 state in SrB4O7:Pr^3+(x=0.0050) or which converts a single UV photon of high energy into two visible photons. The cascade emission observed with this oxide matrix is largely due to the weak crystal field on the cation sites. Analysis of the vibrational coupling indicates that the radiative transition from the 3^P0 state is related to the low photon frequency of the borate groups (BO4) bonded to the Sr^2+ (or Pr^3+) ions (hωmax=～1200 cm^-1). The 1^So→ 1^G4(313nm), 1^S0→1^D2(338nm) and 1^S0→1^I6(405nm) transitions are responsible for the first photon emission. The second photon emission originates from the transitions from the intermediate energy levels (3^P0 and 1^D2) to the lower energy levels [3^P0→(3^HJ, 3^FJ) and 1^D2→(3^H4, 3^H5).

Key words: STRONTIUM OXIDE, BORON OXIDE, PRASEODYMIUM, CHARACTERISTICS OF LUMINESCENCE

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