Omata Takahisa, Nosel Katsuhiro, Otsuka-Yao-Matsuo Shinya
Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan.
J Nanosci Nanotechnol. 2011 Jun;11(6):4815-23. doi: 10.1166/jnn.2011.4181.
We successfully fabricated core/shell-type composite QDs based on the ternary-CuInSe2. For the CuInSe2/ZnSe core/shell QDs, an enhanced photoluminescence (PL) emission intensity, such as 16% of the photoluminescence quantum yield (PLQY), and a blue-shift in the emission after the ZnSe coating, were observed. The increase in the PLQY was the result of an exchange of the surface capping ligand from the organic hexadecylamine to the inorganic ZnSe and the smoothing of the confining profile due to the alloying. The blue-shift was attributed to the shrinkage of the effective size of the core-CuInSe2 region due to the partial alloying of the core-CuInSe2 with the ZnSe-shell around their interfaces. For the inverted core/shell QDs, i.e., the nominally ZnSe/CuIn5Se8 core/shell QDs, they showed a red emission at 619 nm. The emission wavelength is the shortest among the previously reported QDs in Cu-In-Se system.
我们成功制备了基于三元 CuInSe₂ 的核壳型复合量子点。对于 CuInSe₂/ZnSe 核壳量子点，观察到光致发光（PL）发射强度增强，例如光致发光量子产率（PLQY）提高了 16%，并且在包覆 ZnSe 后发射发生蓝移。PLQY 的增加是由于表面封端配体从有机十六胺交换为无机 ZnSe 以及由于合金化导致的限制轮廓平滑化的结果。蓝移归因于由于核 CuInSe₂ 与 ZnSe 壳在其界面处部分合金化，使得核 - CuInSe₂ 区域的有效尺寸缩小。对于倒置核壳量子点，即名义上的 ZnSe/CuIn₅Se₈ 核壳量子点，它们在 619 nm 处呈现红色发射。该发射波长是此前报道的 Cu - In - Se 体系量子点中最短的。
