Synthesis of super bright indium phosphide colloidal quantum dots through thermal diffusion

被引:22
|
作者
Clarke, Mitchell T. [1 ]
Viscomi, Francesco Narda [2 ]
Chamberlaing, Thomas W. [3 ]
Hondow, Nicole [4 ]
Adawi, Ali M. [2 ,5 ]
Sturge, Justin [1 ]
Erwin, Steven C. [6 ]
Bouillarde, Jean-Sebastien G. [2 ,5 ]
Tamang, Sudarsan [7 ]
Stasiuk, Graeme J. [1 ]
机构
[1] Univ Hull, Dept Biomed Sci, Cottingham Rd, Kingston Upon Hull HU6 7RX, N Humberside, England
[2] Univ Hull, Dept Phys & Math, Cottingham Rd, Kingston Upon Hull HU6 7RX, N Humberside, England
[3] Univ Leeds, Sch Chem, Inst Proc Res & Dev, Leeds LS2 9JT, W Yorkshire, England
[4] Univ Leeds, Sch Chem & Proc Engn, Leeds LS2 9JT, W Yorkshire, England
[5] Univ Hull, GW Gray Ctr Adv Mat, Cottingham Rd, Kingston Upon Hull HU6 7RX, N Humberside, England
[6] Naval Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA
[7] Sikkim Univ, Sch Phys Sci, Dept Chem, Tadong 737102, India
关键词
INP/ZNS NANOCRYSTALS; CHEMISTRY; CRYSTALLITES; ELECTRON; SE;
D O I
10.1038/s42004-019-0138-z
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Indium phosphide based quantum dots have emerged in recent years as alternatives to traditional heavy metal (cadmium, lead) based materials suitable for biomedical application due to their non-toxic nature. The major barrier to this application, is their low photoluminescent quantum yield in aqueous environments (typically < 5%). Here we present a synthetic method for InP/ZnS quantum dots, utilizing a controlled cooling step for equilibration of zinc sulfide across the core, resulting in a photoluminescent quantum yield as high as 85% in organic solvent and 57% in aqueous media. To the best of our knowledge, this is the highest reported for indium phosphide quantum dots. DFT calculations reveal the enhancement in quantum yield is achieved by redistribution of zinc sulfide across the indium phosphide core through thermal diffusion. By eliminating the need for a glove box and relying on Schlenk line techniques, we introduce a widely accessible method for quantum dots with a realistic potential for improved biomedical applications.
引用
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页数:7
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