[21p-S422-1~19] 3.4 Biomedical optics

▼ [21p-S422-14] Multifunctional ZnS:Mn/NaGdF₄:Yb:Er nanostructure for multimodal bio-imaging

〇Thangaraju Dheivasigaman¹, Yuriko Masuda², Mohamed Mathar Sahib Ibrahim Khaleelullah², Wataru Inami^1,2, Yoshimasa Kawata^1,2, Tadanobu Koyama¹, Yasuhiro Hayakawa^1,2 (1.RIE Shizuoka Univ, 2.GSST Shizuoka Univ)

Keywords:ZnS:Mn/NaGdF4:Yb:Er nanostructure,bio-imaging,cathodoluminescence

Manganese doped ZnS embedded NaGdF₄:Yb:Er nanocomposite synthesized using single step hot injection method was investigated. Synthesized samples were characterized by structural, morphological, and luminescence analysis. Crystalline phase of synthesized ZnS:Mn/NaGdF₄:Yb:Er was confirmed using X-ray diffraction analysis and compared with thermal decomposition method synthesized NaGdF₄:Yb:Er and ZnS:Mn²⁺ quantum dots. Composite formation and morphological changes were analyzed by transmission electron microscopy. Enhanced up-conversion red emission (⁴F_9/2 – ⁴I_15/2) was observed in NaGdF₄:Yb:Er luminescence in presence of ZnS:Mn. Excitation and down-conversion emission analysis confirmed the modified emission of ZnS:Mn/NaGdF₄:Yb:Er in the lower wavelength region. Broad visible emission covered from green to red of the synthesized ZnS:Mn/NaGdF₄:Yb:Er was established by cathodoluminescence measurement. The obtained nanocomposite with multi-modal character was utilized to study up-conversion and down-conversion optical imaging using He-La cells as a biological specimen. Acquired bio-imaging results show that the multi-modal luminescence ability of synthesized nanocomposite is fit with the up-conversion as well as down-conversion imaging.