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首页> 外文期刊>Chinese science bulletin >Near-infrared to visible up-conversion emissions of Er~(3+) doped Al_2O_3 powders derived from the sol-gel method
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Near-infrared to visible up-conversion emissions of Er~(3+) doped Al_2O_3 powders derived from the sol-gel method

机译：溶胶-凝胶法制备掺Er〜（3+）的Al_2O_3粉末的近红外到可见光的上转换发射

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The Er~(3+) doped Al_2O_3 powders were prepared by the sol-gel method using the aluminium isopropoxide [Al(OC_3H_7)_3]-derived Al_2O_3 sols with addition of the erbium nitrate [Er(NO_3)_3 5H_2O]. The different phase structure, including three crystalline types of (Al,Er)_2O_3 phases, γ, θ, α, and two Er-Al-0 phases, ErAlO_3 and Al_(10)Er_6O_(24), was obtained with the 1 mol% Er~(3+) doped Al_2O_3 powders at the different sintering temperatures of 600-1200 ℃. The green and red up-conversion emissions centered at about 523, 545 and 660 nm, corresponding respectively to the~ 2H_(11/2),~4S_(3/2)→~4I_(15/2) and ~4F_(9/2)→~4I(15/2) transitions of Er~(3+), were detected by a 978 nm semiconductor laser diodes excitation. The phase structure and OH content had evident influence on the up-conversion emissions intensity. The maximum intensities of both the green and red emissions were obtained respectively for the Er~(3+) doped Al_2O_3 powders sintered at 1200 ℃, which was composed mainly of α-(Al,Er)_2O_3, less of ErAlO_3 and Al_(10)Er_6O_(24) phases, and with the least OH content. The two-photon absorption up-conversion process was involved in the green and red up-conversion emissions of the Er~(3+) doped Al_2O_3 powders.
机译：通过异丙醇铝[Al（OC_3H_7）_3]衍生的Al_2O_3溶胶并添加硝酸er [Er（NO_3）_3 5H_2O]，通过溶胶-凝胶法制备了Er〜（3+）掺杂的Al_2O_3粉末。在1 mol的条件下获得了不同的相结构，包括（Al，Er）_2O_3三种晶体类型γ，θ，α和两个Er-Al-0相ErAlO_3和Al_（10）Er_6O_（24）。在600-1200℃的不同烧结温度下，％Er〜（3 +）掺杂Al_2O_3粉体的形成。绿色和红色上转换发射的中心波长约为523、545和660 nm，分别对应于〜2H_（11/2），〜4S_（3/2）→〜4I_（15/2）和〜4F_（9通过978 nm半导体激光二极管激发检测到Er〜（3+）的/ 2）→〜4I（15/2）跃迁。相结构和OH含量对上转换发射强度有明显的影响。在1200℃烧结的Er〜（3+）掺杂Al_2O_3粉末分别得到了绿色和红色发射的最大强度，主要由α-（Al，Er）_2O_3组成，较少的ErAlO_3和Al_（10 Er_6O_（24）相，且OH含量最少。二光子吸收上转换过程参与了Er〜（3+）掺杂的Al_2O_3粉末的绿色和红色上转换发射。

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