THE ENERGY LEVEL SPLITTING OF THE EXCITED Tb3+4f75d1 STATE IN LaOBr1-xClx CRYSTALS

Zhao Wei; Wang Yanji; Su Mianzeng; Song Zengfu

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THE ENERGY LEVEL SPLITTING OF THE EXCITED Tb³⁺4f⁷5d¹ STATE IN LaOBr_1-xCl_x CRYSTALS

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- THE ENERGY LEVEL SPLITTING OF THE EXCITED Tb³⁺4f⁷5d¹ STATE IN LaOBr_1-xCl_x CRYSTALS
- Chinese Journal of Luminescence Vol. 9, Issue 3, Pages: 199-206(1988)
- 作者机构：
  
  1. 北京大学物理系
  2. 北京大学化学系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：21 September 1987，
  
  Published：30 August 1988
- 稿件说明：
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赵纬, 王彦吉, 苏勉曾, 宋增福. LaOBr1-xClx:Tb3+晶体中Tb3+的4f75d1激发态的能级分裂[J]. 发光学报, 1988,9(3): 199-206

Zhao Wei, Wang Yanji, Su Mianzeng, Song Zengfu. THE ENERGY LEVEL SPLITTING OF THE EXCITED Tb3+4f75d1 STATE IN LaOBr1-xClx CRYSTALS[J]. Chinese Journal of Luminescence, 1988,9(3): 199-206
赵纬, 王彦吉, 苏勉曾, 宋增福. LaOBr1-xClx:Tb3+晶体中Tb3+的4f75d1激发态的能级分裂[J]. 发光学报, 1988,9(3): 199-206 DOI：

Zhao Wei, Wang Yanji, Su Mianzeng, Song Zengfu. THE ENERGY LEVEL SPLITTING OF THE EXCITED Tb3+4f75d1 STATE IN LaOBr1-xClx CRYSTALS[J]. Chinese Journal of Luminescence, 1988,9(3): 199-206 DOI：

摘要

在室温和78K下对六种LaOBr

1-x

:Tb

(

=0、0.2、0.4、0.6、0.8、1.0)粉末样品的4f

激发谱进行了研究

在78K下观察到了Tb

离子的4f

激发态的能级分裂。利用点电荷模型计算得到了LaOBr

1-x

:Tb

晶体中Tb

的4f

激发态能级的分裂值。考虑到LaOBr

1-x

:Tb

化合物的共价性等因素

三个因子α=0.32

β=0.67-1.08

γ=0.32-0.40相应地引入到A

展开式中与O.X.La有关的各项中。计算得到的能级分裂值和实验值相差小于20cm

-1

。

Abstract

LaOBr:Tb and LaOCl:Tb are efficient cathodo-and x-ray phosphors.They have the type of structure as PBFC1 and consist of alternative layers of La-O-La-X-La. Their tetragonal unit cell is shown in Fig.1

[1]

. Each La

ion is 9-coordinated by 4 oxide ions on one side and 5 halide

ions on the other side. Four halide ions locate at equal distance to La

and the fifth one locates further. The doped Tb

ions replace the La

ions in a point site of C4v symmetry. Holsa and coworkers have studied the splitting of the ground

stats of Tb

in LaOCl matrix

[2]

. The authors have investigated the physico-chemical properties and luminescence of LaOBr

1-x

:Tb system in detail

[3]

. The lattice constants a and c change linearly with the composition

. This shows that the system forms complete solid solution.

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