Energy Transfer from Sm3+ to Eu3+ in Red-Emitting Phosphor LaMgAl11O19:Sm3+, Eu3+ for Solar Cells and Near-Ultraviolet White Light-Emi

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• 作者：Xin Min ; Zhaohui Huang ; Minghao Fang ; Yan-Gai Liu ; Chao Tang ; Xiaowen Wu
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：June 16, 2014
• 年：2014
• 卷：53
• 期：12
• 页码：6060-6065
• 全文大小：411K
• 年卷期：v.53,no.12(June 16, 2014)
• ISSN：1520-510X

文摘

The red-emitting phosphor LaMgAl<sub>11sub>O<sub>19sub>:Sm<sup>3+sup>, Eu<sup>3+sup> was prepared by solid-state reaction at 1600 掳C for 4 h. The phase formation, luminescence properties, and energy transfer from Sm<sup>3+sup> to Eu<sup>3+sup> were studied. With the addition of 5 mol % Sm<sup>3+sup> as the sensitizer, the excitation wavelength of LaMgAl<sub>11sub>O<sub>19sub>:Eu<sup>3+sup> phosphor was extended from 464 to 403 nm, and the emission intensity under the excitation at 403 nm was also enhanced. The host material LaMgAl<sub>11sub>O<sub>19sub> could contain the high doping content of Eu<sup>3+sup> (20 mol %) without concentration quenching. This energy transfer from Sm<sup>3+sup> to Eu<sup>3+sup> was confirmed by the decay times of energy donor Sm<sup>3+sup>. The mechanism of energy transfer (Sm<sup>3+sup> 鈫?Eu<sup>3+sup>) was proved to be quadrupole鈥搎uadrupole interaction. Under the 403 nm excitation at 150 掳C, the emission intensities of the characteristic peaks of Sm<sup>3+sup> and Eu<sup>3+sup> in LaMgAl<sub>11sub>O<sub>19sub>:0.05Sm<sup>3+sup>, 0.2Eu<sup>3+sup> phosphor were decreased to 65% and 56% of the initial intensities at room temperature, and the relatively high activation energy proved that this phosphor had a good thermal stability. The CIE coordinate was calculated to be (x = 0.601, y = 0.390). The LaMgAl<sub>11sub>O<sub>19sub>:0.05Sm<sup>3+sup>, 0.2Eu<sup>3+sup> phosphor is a candidate for copper phthalocyanine-based solar cells and white light-emitting diodes.