Investigação de Er3+ nos dois sítios cristalográficos de Gd2SiO5 através da fotoluminescência resolvida no tempo

Química Nova

Andrea S. S. De Camargo²  Jandira Ap. Simoneti²  Marian R. Davolos²  Maria José V. Bell¹  Luiz Antonio De O. Nunes¹ 

[1] ,Universidade Estadual Paulista Instituto de Química de Araraquara Depto. de Química Geral e InorgânicaAraraquara SP

关键词: gadolinium oxyorthosilicate;    erbium;    time resolved photoluminescence;   

DOI  :  10.1590/S0100-40422000000600006

来源: SciELO

【 摘 要 】

Gadolinium oxyortho-silicate, Gd2SiO5, presents a monoclinic structure with two crystallographic sites in which Gd3+ ions are equally distributed with coordination numbers CN, 7 and 9, respectively. By doping this host with Er3+ it is possible to distinguish and attribute the two sites by means of lifetime determination of the 4S3/2 state, (in this case, Er3+ substitutes Gd3+ ions). Samples doped with 0.1 and 5.0% molar Er3+ were prepared by solid state reaction and characterized by X-ray Diffractometry, Vibrational and Electronic Absorption Spectroscopies, and Time Resolved Photoluminescence. Based on the experimental results, it is possible to verify that, for the 5,0% doped sample, the lifetime value of the 4S3/2 state of the erbium ion inserted in site 1, (CN = 9), is 2.7 ± 0.1 mus, and for the one inserted in site 2, (CN = 7), it is 1.5 ± 0.1 mus.

【 授权许可】

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