稀土固体发光研究中的几个化学问题

石春山; 叶泽人

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稀土固体发光研究中的几个化学问题

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- 稀土固体发光研究中的几个化学问题
- SOME CHEMICAL PROBLEMS ON LUMINESCENCE STUDIES OF RARE EARTH IONS IN SOLID STATE HOSTS
- 发光学报 1984年05卷第4期页码：76-86
- 作者机构：
  
  中国科学院长春应用化学研究所
- 作者简介：
- 基金信息：
- DOI：
  中图分类号：
- 收稿：1983-08-27，
  
  纸质出版：1984-12
- 稿件说明：
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石春山, 叶泽人. 稀土固体发光研究中的几个化学问题[J]. 发光学报, 1984,05(4):76-86.

Chunshan Shi, Zeren Ye. SOME CHEMICAL PROBLEMS ON LUMINESCENCE STUDIES OF RARE EARTH IONS IN SOLID STATE HOSTS[J]. Chinese Journal of Luminescence, 1984, 05(4): 76-86.
石春山, 叶泽人. 稀土固体发光研究中的几个化学问题[J]. 发光学报, 1984,05(4):76-86. DOI：

Chunshan Shi, Zeren Ye. SOME CHEMICAL PROBLEMS ON LUMINESCENCE STUDIES OF RARE EARTH IONS IN SOLID STATE HOSTS[J]. Chinese Journal of Luminescence, 1984, 05(4): 76-86. DOI：

摘要

文章综述了近年来在稀土固体发光研究中的几个主要化学问题，着重讨论了化学组成及晶体结构对稀土离子在固态基质中发光的影响。

Abstract

Some chemical problems on luminescence studies of rare earth ions in solid state hosts are reviewed in this paper.

First

the influence of the chemical composition and crystal structure on luminescence properties of rare earth ion activated phosphors is discussed.It involves the influence of the surroundings of rare earth ion on transition probabilities

luminescence efficiency

thermal quenching and spectral nature.

The influence of the surroundings of a rare earth ion on its 4f levels is very weak. This results in a very weak crystal-field splitting of these levels. The transition probabilities for f-f transitions can be strongly influenced by the surroundings. Energy levels and transitions involving a charge transfer or a 5d state are more strongly influenced by the rare earth ion surroundings in the lattice.

is the defference between the equilibrium configuration of the excited state and that of the ground state. The Δ

is negative when the cation is excited and is positive when the anion is excited. Luminescence centres are divided into two groups: Δ

0 (excitation of an

ion electrons) and Δ

0 (excitation of cation electrons) .

The spectral nature is different when the symmetry at the crystallographic site of the rare earth ion is different. The relation between the spectral nature and the symmetry can be studied with 32 point groups.

Second

the influence of the activator concentration on luminescence nature is discussed. The concentration quenching may be explained in a number of cases as follows. If the concentration of the activator becomes so high that the probability of energy transfer exceeds that of emission

the excitation energy will be transferred and lost through the lattice.

The influence of concentration on chromaticity is marked.

Third

the influence of impurities on luminescence is discussed. Impurities can affect brightness of rare earth ion activated phosphors. Cerium is the most dramatic quencher in the red light emitting rare earth phosphors. Calcium is generally detrimental in rare earth raw materials.

Finally

the influence of the anion on luminescence is discussed too. can affect brightness of rare earth ion activated phosphors. Cerium is the most dramatic quencher in the red light emitting rare earth phosphors. Calcium is generally detrimental in rare earth raw materials.

Finally

the influence of the anion on luminescence is discussed too.

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