CaLaAl3O7∶Eu3+的凝胶-燃烧法合成及其发光性能

doi:10.3964/j.issn.1000-0593(2008)12-2781-04

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Abstract Using the gel-combustion method the precursors of CaLa_1-xAl₃O₇∶xEu³⁺(0.05≤x≤0.8) were prepared. When annealing temperature was below 700 ℃, the materials were in amorphous state, while as annealing temperature was above 800 ℃, the high purity CaLa_1-xAl₃O₇∶xEu³⁺ crystalline materials were obtained. The luminescence properties of CaLa_1-xAl₃O₇∶xEu³⁺ both in amorphous and crystalline phases were investigated, and the results of excitation spectrum show a similar charge transition band of Eu³⁺—O^2- between 230 nm and 320 nm and a series of f—f transition of Eu³⁺ ion. However, the strongest band of amorphous material was at 465 nm corresponding to ⁷F₀—⁵D₂ transition, and those of the crystalline materials were at 394 nm corresponding to ⁷F₀—⁵L₆ transition of Eu³⁺ ion. In amorphous state materials the emission intensity of excitation wavelength 465 nm was stronger than that of 394 nm, and composition of ⁵D₀—⁷F₀ transition at 578 nm, ⁵D₀—⁷F₁ transition at 587 nm and ⁵D₀—⁷F₂ transition at 615 nm. In crystalline material, the emission intensity of excitation wavelength of 394 nm was stronger than that of 465 nm, the ⁵D₀—⁷F₀ transition disappeared, and the ⁵D₀—⁷F₁ transition split into 587 nm and 596 nm. With the increase in temperature, the strongest band at 615 nm increased, and what is more, the ⁵D₀—⁷F₁ transition increased remarkably. In CaLa_1-xAl₃O₇∶xEu³⁺, when x=0.2 for the co-doping Eu³⁺ ion and the mol proportion of citric acid and metal ion (C/M) was 1.2, the luminescence intensity was the highest.

Key words：CaLaAl₃O₇∶ Eu³⁺;Gel-combustion method;Luminescence properties

Received: 2007-05-10 Accepted: 2007-08-20

ZTFLH:

TG146.4

Corresponding Authors: SHA Ren E-mail: sr@imnu.edu.cn

Cite this article:

SHA Ren,WANG Xi-gui,WU Hong-ying, et al. Synthesis of CaLaAl₃O₇∶Eu³⁺ by Gel-Combustion Method and Its Luminescence Properties[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(12): 2781-2784.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2008)12-2781-04 OR https://www.gpxygpfx.com/EN/Y2008/V28/I12/2781

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