Color-tunable optical properties of cadmium-free transition metal ions doped InP/ZnS quantum dots
Color-tunable optical properties of cadmium-free transition metal ions doped InP/ZnS quantum dots
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无镉过渡金属离子掺杂InP/ZnS量子点的颜色可调光学特性
DOI：
10.1016/j.jlumin.2019.04.040
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发表时间：
2019-08-01
影响因子：
3.6
通讯作者：
Guo, Ruiqian
中科院分区：
文献类型：
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作者：
Mei, Shiliang;Wei, Xian;Guo, Ruiqian
无镉InP量子点具有许多独特的光学性质，在发光材料方面有着广阔的应用前景。本工作首次采用有机合成的方法，通过成核掺杂的方法制备了一系列平均尺寸为3.2-3.7 nm的过渡金属离子（Cu，Mn）单掺杂和共掺杂的InP/ZnS量子点，并对这些量子点的发光性能进行了研究。这三种掺杂的InP/ZnS量子点均表现出双发光，一个发光峰位于绿色附近，这是由于本征态的存在，另一个发光峰位于橙红色附近，这两个发光峰的相对强度可以通过改变Cu或Mn的掺杂浓度来有效调节。当Cu掺杂浓度从0.25%增加到10%时，Cu掺杂InP/ZnS量子点在572 ~ 696 nm范围内的掺杂发光得以实现，而Mn掺杂InP/ZnS量子点在572 ~ 696 nm范围内的掺杂发光峰位随Mn掺杂浓度的增加基本不变。此外，通过稳态和时间分辨荧光光谱的测量，研究了Cu和Mn掺杂在InP/ZnS量子点体系中的相互作用机理。结果表明，掺杂剂的发射是由铜掺杂，而不是锰掺杂为主。掺杂InP/ZnS量子点的这些独特结果将有助于理解掺杂的基本方面，单相掺杂InP/ZnS量子点的双发射和颜色可调的光学特性将赋予它们作为用于固态照明的颜色转换材料的巨大前景。
Cadmium-free InP quantum dots (QDs) exhibit many unique optical properties, and show great promise as light emitting materials. In this work, a series of high-efficient and color-tunable transition metal ions (Cu, Mn) single- and co-doped InP/ZnS QDs with the average size of 3.2-3.7 nm, were firstly prepared via a nucleation-doping method in an organic synthetic route. These three kinds of doped InP/ZnS QDs all exhibit dual emission with one peak position around green region owing to the intrinsic state and the other peak position around orange-red region resulted from dopant emission, the relative intensity of which can be effectively tuned by varying Cu or Mn dopant concentration. The dopant emission of Cu doped InP/ZnS QDs from 572 to 696 nm can be realized via increasing Cu dopant concertration from 0.25% to 10%, while the peak position of dopant emission in Mn doped InP/ZnS QDs system remains unaltered as Mn dopant concentration increasing. Besides, the interaction mechanism of Cu and Mn dopant in co-doped InP/ZnS QDs system was investigated with steady-state and time-resolved PL spectroscopy measurements. The results reveal that the dopant emission is dominated by Cu doping rather than Mn doping. These unique results in doped InP/ZnS QDs would help to understand the fundamental aspects of doping, and the dual-emissive and color-tunable optical properties of single-phase doped InP/ZnS QDs will endow them with great promise as color-converting materials for use in solid-state lighting.