Green up-conversion and infrared emission spectra of U3+ in LaCl3

被引：7

作者：

Yin, M

Joubert, MF

Krupa, JC

机构：

[1] UNIV LYON 1,LAB PHYSICOCHIM MAT LUMINESCENTS,CNRS,UMR 5620,F-69622 VILLEURBANNE,FRANCE

[2] INST PHYS NUCL,GRP RADIOCHIM,F-91406 ORSAY,FRANCE

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1997年 / 260卷 / 1-2期

关键词：

up-conversion; new levels; low-temperature infrared emission spectra; lifetimes; LaCl3; U3+;

D O I：

10.1016/S0925-8388(97)00160-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A strong green emission of U3+ ions in LaCl3 under red excitation has been observed for the first time. The main anti-Stokes fluorescence arises from the U3+ K-2(15/2) state (around 550 nm). Theoretical analysis and decaytime measurement of the induced fluorescence show that there are two mechanisms for the up-conversion. The first one consists in excited state absorption and the other one is due to energy transfer between two U3+ ions in the F-4(9/2) state. In addition a detailed study of infrared emission spectra of LaCl3:U3+ has been carried out and lifetimes of main fluorescent levels were measured at low temperature. From this study three new experimental levels have been assigned. (C) 1997 Elsevier Science S.A.

引用

页码：64 / 69

页数：6

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