Electrophoretically deposited Y2O3:Bi3+,Eu3+ nanosheet films with high transparency for near-ultraviolet to red light conversion
Electrophoretically deposited Y2O3:Bi3+,Eu3+ nanosheet films with high transparency for near-ultraviolet to red light conversion
复制标题
电泳沉积 Y2O3:Bi3 ,Eu3 纳米片薄膜具有高透明度，用于近紫外光到红光转换
DOI：
10.1021/acs.langmuir.7b04334
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Isobe Tetsuhiko
中科院分区：
文献类型：
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作者：
Kosuge Yuta;Iso Yoshiki;Isobe Tetsuhiko
通过沉积Y2O3：Bi3+，Eu3+纳米薄片制备了在近紫外光照射下发出红光的荧光膜。采用水热法合成了Y2O3：Bi3+，Eu3+前驱体纳米片，并对其进行了焙烧处理。制备了表面吸附了聚乙烯亚胺的带正电的Y_2O_3：Bi3+，Eu~(3+)纳米片状水分散体，用于沉积。在恒定电压下，在透明导电衬底上电泳法沉积了荧光纳米片。得到的纳米薄膜致密均匀，对激发光表现出良好的光稳定性。纳米片薄膜的生长导致了透过率的降低和光致发光强度的增加。前者是由于薄膜内部空洞和粗糙表面的光散射引起的。在薄膜上涂覆一层聚乙烯吡咯烷酮(PVP)，使薄膜在可见光范围内的透过率大于70%。这些效应归因于PVP的低折射率在薄膜表面产生的减反射效应。此外，通过在粗糙的表面涂上光滑的PVP薄膜和用PVP填充纳米薄膜中的空洞来抑制光散射，也提高了透过率。
Fluorescent films were fabricated by depositing Y2O3:Bi3+,Eu3+nanosheets, which emit red light under near-UV irradiation. The Y2O3:Bi3+,Eu3+nanosheets were obtained by calcining hydroxide precursor nanosheets synthesized through a hydrothermal method. An aqueous dispersion of positively charged Y2O3:Bi3+,Eu3+nanosheets with polyethyleneimine adsorbed to the surface was prepared for their deposition. Fluorescent nanosheets were electrophoretically deposited on a transparent conductive substrate under a constant voltage. The obtained nanosheet films were dense and uniform and showed excellent photostability against the excitation light. Growth of the nanosheet film caused a decrease in transmittance and an increase in the photoluminescence intensity. The former effect was attributed to light scattering from inner voids and the rough surface of the film. A polyvinylpyrrolidone (PVP) coating on the film improved the transmittance to be greater than 70% over the visible region. These effects were attributed to antireflection effects at the film surface owing to the low refractive index of PVP. Furthermore, suppression of light scattering by coating the rough surface with a smooth PVP film and filling of voids in the nanosheet film with PVP also improved the transmittance.