WCU Hybrid Materials Program, Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 151-744, Korea.
Nanoscale Res Lett. 2012 Dec 12;7(1):672. doi: 10.1186/1556-276X-7-672.
The effects of surface passivation on the photoluminescence (PL) properties of CdS nanoparticles oxidized by straightforward H2O2 injection were examined. Compared to pristine cadmium sulfide nanocrystals (quantum efficiency ≅ 0.1%), the surface-passivated CdS nanoparticles showed significantly enhanced luminescence properties (quantum efficiency ≅ 20%). The surface passivation by H2O2 injection was characterized using X-ray photoelectron spectroscopy, X-ray diffraction, and time-resolved PL. The photoluminescence enhancement is due to the two-order increase in the radiative recombination rate by the sulfate passivation layer.
采用简单的 H2O2 注入法氧化 CdS 纳米粒子，研究了表面钝化对其光致发光（PL）性能的影响。与未处理的硫化镉纳米晶体（量子效率≈0.1%）相比，经表面钝化的 CdS 纳米粒子表现出显著增强的发光性能（量子效率≈20%）。通过 X 射线光电子能谱、X 射线衍射和时间分辨 PL 对 H2O2 注入的表面钝化进行了表征。光致发光增强归因于硫酸根钝化层使辐射复合速率提高了两个数量级。
