Lee Hyeokjin, Holloway Paul H, Yang Heesun, Hardison Lindsay, Kleiman Valeria D
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, USA.
J Chem Phys. 2006 Oct 28;125(16):164711. doi: 10.1063/1.2363181.
For the synthesis of colloidal ternary ZnCdSe nanorods, CdSe nanorods were first prepared under a mixture of tetradecylphosphonic acid/trioctylphosphine oxide surfactants at 250 degrees C, and then ZnSe shell layer was grown onto CdSe nanorods at 180 degrees C, forming CdSeZnSe core/shell nanorods. Green-yellow emitting ternary ZnCdSe nanorods were obtained by a subsequent alloying process at 270 degrees C for 1-3 h through the diffusion of Zn ions into CdSe nanorods. The photoluminescence quantum yield (QY) of ZnCdSe nanorods was 5%-10%, which is higher than that from pristine CdSe nanorods (0.6%). The QY of these alloy nanorods depends on the alloying time and is discussed in terms of compositional disorders and defects produced by the alloying process. The Raman and time resolved photoluminescence spectroscopies were used to understand the detailed alloying process from CdSeZnSe core/shell to ZnCdSe alloy nanorods.
为了合成胶体三元ZnCdSe纳米棒，首先在250℃下于十四烷基膦酸/三辛基氧化膦表面活性剂的混合物中制备CdSe纳米棒，然后在180℃下在CdSe纳米棒上生长ZnSe壳层，形成CdSeZnSe核/壳纳米棒。通过在270℃下进行1-3小时的后续合金化过程，使锌离子扩散到CdSe纳米棒中，从而获得发出绿黄色光的三元ZnCdSe纳米棒。ZnCdSe纳米棒的光致发光量子产率（QY）为5%-10%，高于原始CdSe纳米棒的光致发光量子产率（0.6%）。这些合金纳米棒的QY取决于合金化时间，并从合金化过程产生的成分无序和缺陷方面进行了讨论。利用拉曼光谱和时间分辨光致发光光谱来了解从CdSeZnSe核/壳到ZnCdSe合金纳米棒的详细合金化过程。
