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首页> 外文期刊>RSC Advances >Styryl phenanthrimidazole-fluorescence switched on by core/shell BaTiO3/ZnO and Mn-doped TiO2/ZnO nanospheres and switched off by the core nanoparticles
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Styryl phenanthrimidazole-fluorescence switched on by core/shell BaTiO3/ZnO and Mn-doped TiO2/ZnO nanospheres and switched off by the core nanoparticles

机译：核/壳BaTiO3 / ZnO和Mn掺杂的TiO2 / ZnO纳米球开启苯乙烯基苯并咪唑荧光，核心纳米颗粒关闭

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摘要

Absorption, fluorescence and lifetime spectral studies have been carried out to probe the interaction of fluorophore (E)-1-phenyl-2-styryl-1H-phenanthro[9,10-d] imidazole with sol-gel synthesised BaTiO3/ZnO and Mn-doped TiO2/ZnO core/shell and pristine ZnO nanospheres and BaTiO3 and Mn-doped TiO2 nanoparticles. The emission of fluorophore is switched on by Mn-doped TiO2/ZnO and BaTiO3/ZnO core/shell and pristine ZnO nanospheres, and switched off by Mn-doped TiO2 and BaTiO3 nanoparticles owing to charge injection from the excited singlet state of fluorophore to the conduction band (CB) of the nanosemiconductors. The affinity of the fluorophore to ZnO results in the lowering of HOMO and LUMO energy levels of fluorophore, leading to emission at similar to 420 nm. This is due to LUMO -> HOMO, LUMO -> CB and deep level emission (DLE) of ZnO resulting in the enhancement of fluorescence. The HOMO and LUMO energy levels of the fluorophore are unlikely to be influence by core BaTiO3 and Mndoped TiO2 nanoparticles. This leads to quenching of fluorescence because of electron transfer from LUMO -> CB.
机译：进行了吸收，荧光和寿命谱研究，以研究荧光团（E）-1-苯基-2-苯乙烯基-1H-菲咯[9,10-d]咪唑与溶胶-凝胶合成的BaTiO3 / ZnO和Mn的相互作用掺杂的TiO2 / ZnO核/壳和原始ZnO纳米球以及BaTiO3和Mn掺杂的TiO2纳米颗粒。荧光团的发射通过Mn掺杂的TiO2 / ZnO和BaTiO3 / ZnO核/壳以及原始的ZnO纳米球来开启，而由于Mn掺杂的TiO2和BaTiO3纳米球来关闭，这是因为电荷从荧光团的激发单重态向电子注入。纳米半导体的导带（CB）。荧光团对ZnO的亲和力导致荧光团的HOMO和LUMO能级降低，从而导致发射类似于420 nm的光。这是由于LUMO-> HOMO，LUMO-> CB和ZnO的深能级发射（DLE）导致荧光增强。荧光团的HOMO和LUMO能级不太可能受核心BaTiO3和Mndoped TiO2纳米粒子的影响。由于从LUMO-> CB转移电子，导致荧光猝灭。

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