Antipov Andrei, Bell Matt, Yasar Mesut, Mitin Vladimir, Scharmach William, Swihart Mark, Verevkin Aleksandr, Sergeev Andrei
Electrical Engineering Department, University at Buffalo, Buffalo, NY 14260, USA.
Nanoscale Res Lett. 2011 Feb 14;6(1):142. doi: 10.1186/1556-276X-6-142.
We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state. Several pronounced changes have been observed in the narrow temperature interval near the water melting point. First of all, the luminescence intensity substantially (approximately 50%) increases near the transition. In a large temperature scale, the energy peak of the photoluminescence decreases with temperature due to temperature dependence of the energy gap. Near the melting point, the peak shows N-type dependence with the maximal changes of approximately 30 meV. The line width increases with temperature and also shows N-type dependence near the melting point. The observed effects are associated with the reconstruction of ligands near the ice/water phase transition.
我们研究了溶解在水中的胶体核/壳CdSe/ZnS纳米颗粒中的纳秒光致发光过程，发现发光对溶剂状态具有很强的敏感性。在接近水熔点的狭窄温度区间内观察到了几个明显的变化。首先，在转变附近发光强度大幅（约50%）增加。在较大的温度范围内，由于能隙的温度依赖性，光致发光的能量峰值随温度降低。在熔点附近，峰值呈现N型依赖性，最大变化约为30毫电子伏特。线宽随温度增加，并且在熔点附近也呈现N型依赖性。观察到的这些效应与冰/水相变附近配体的重构有关。
