Phosphine-free synthesis of Zn1-xCdxSe/ZnSe/ZnSexS1-x/ZnS core/multishell structures with bright and stable blue-green photoluminescence
Phosphine-free synthesis of Zn1-xCdxSe/ZnSe/ZnSexS1-x/ZnS core/multishell structures with bright and stable blue-green photoluminescence
复制标题
无磷合成具有明亮稳定蓝绿色光致发光的Zn1-xCdxSe/ZnSe/ZnSexS1-x/ZnS核/多壳结构
DOI：
10.1039/c0jm03605f
复制
发表时间：
2011-01-01
影响因子：
--
通讯作者：
Li, Lin Song
中科院分区：
文献类型：
--
作者：
Shen, Huaibin;Zhou, Changhua;Li, Lin Song
采用无膦法成功合成了具有高光致发光（PL）的Zn 1-xCd xSe/ZnSe/ZnSexS 1-x/ZnS核/多壳纳米晶。选择ZnSexS 1-x合金作为壳层材料，在预合成的Zn 1-xCdxSe纳米晶上外延生长。通过降低ZnSexS 1-x中Se和S的摩尔比，壳层组成逐渐从ZnSe变为ZnS。这些核/多壳纳米晶体的PL发射可以从450到530 nm调谐。合成的纳米晶体的PL量子产率（QY）达到50至75%，半高宽（FWHM）在28和45 nm之间。通过有机-水相转移方法，这种核/多壳纳米晶体可以成功地转移到水中使用两亲性低聚物（聚马来酸正十六醇酯）作为表面涂层剂。结果发现，壳层厚度的assynthesized核/多壳纳米晶体显着影响相转移效率。稳定性测试表明，水溶性Zn 1-xCd xSe/ZnSe/ZnSexS 1-x/ZnS核/多壳纳米晶具有很高的PL QY，在各种生理条件下具有很好的稳定性。
Highly photoluminescent (PL) Zn1-xCdxSe/ZnSe/ZnSexS1-x/ZnS core/multishell nanocrystals were successfully synthesized by a phosphine-free method. Alloyed ZnSexS1-x was chosen as the shell material to epitaxially grow on pre-synthesized Zn1-xCdxSe nanocrystals. By decreasing the molar ratio between Se and S in ZnSexS1-x, the shell composition gradually changed from ZnSe to ZnS. The PL emissions of these core/multishell nanocrystals can be tuned from 450 to 530 nm. The PL quantum yields (QYs) of as-synthesized nanocrystals reached 50 to 75% with full width at half maximum (FWHM) between 28 and 45 nm. By an organic-aqueous phase transfer method, such core/multishell nanocrystals can be transferred into water successfully using an amphiphilic oligomer (polymaleic acid n-hexadecanol ester) as a surface coating agent. It was found that the shell thicknesses of the assynthesized core/multishell nanocrystals dramatically affected the phase transfer efficiency. Stability tests showed that the water-soluble Zn1-xCdxSe/ZnSe/ZnSexS1-x/ZnS core/multishell nanocrystals with 10 monolayers of shells had very high PL QY and stability in various physiological conditions.