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化学氧化多孔硅经cis Ru(bpy) 2 (CN) 2 的乙醇溶液浸泡后 ,发光峰位红移 ,强度减弱 ,激发态寿命缩短 .而在trans Ru(py) 4(CN) 2 溶液中浸泡的氧化多孔硅的发光峰位 ,强度和寿命几乎没有变化 .对比两个染料分子的氧化还原电位和光吸收性质得出 :与trans Ru(py) 4(CN) 2 相比 ,cis Ru(bpy) 2 (CN) 2 有一个与多孔硅发光能量接近的低能级吸收带 ,使得多孔硅纳米粒子向该染料分子传递能量成为可能 ,能量传递的发生引起了发光峰位的红移和激发态寿命的缩短 ,虽然伴随着发光效率的损耗 ,但对有目的地选择染料分子来改变多孔硅的发光峰位和获得激发态寿命尽可能小的多孔硅提供了思路 ,也为深入理解多孔硅的光致发光机制提供了更多的实验事实
The chemical oxidation of porous silicon by cis Ru (bpy) 2 (CN) 2 ethanol solution, the red-shifted peak position, the intensity weakened, shorten the life of the excited state. In trans Ru (py) 4 Of the oxidized porous silicon showed almost no change in peak intensity, luminescence intensity and lifetime.Comparing the redox potential and the light absorption properties of the two dye molecules, we found that compared with trans Ru (py) 4 (CN) 2, cis Ru (bpy) 2 (CN) 2 has a low-level absorption band close to the luminescence energy of porous silicon, making it possible for porous silicon nanoparticles to transfer energy to the dye molecules. The occurrence of energy transfer causes red-shift and excited-state lifetime of the luminescence peak Shortening, accompanied by loss of luminous efficiency, offers the idea of selectively selecting dye molecules for changing the luminescence peak of porous silicon and obtaining porous silicon having as short an excited state as possible, and also provides a deep understanding of the photodissociation of porous silicon Luminescence mechanism provides more experimental facts