Indium phosphide (InP) colloidal nanocrystals (quantum dots) possess size-dependent optical properties. Their broad absorptions and narrow emission profiles make them desirable for applications ranging from biological imaging to display technologies. Their use is not as common as the ubiquitous quantum dot material cadmium selenide, despite the disadvantages cadmium has with respect to human health and the environment. This stems from the challenges of InP synthesis, which include poor control over size, size-distribution, and poor quantum yields. New methods for InP synthesis, such as microwave-assisted methods, can provide a simpler route to high quality materials. Key to NC luminescence is use of an ionic liquid with a fluoride-containing anion.  The ionic liquid is responsible for both efficient heating of the reaction solution and efficient luminescence from the NCs. We also explored the impact of the ionic liquid on the microwave-assisted reactions by characterizing their decomposition products using NMR and IR spectroscopies. InP NCs of high quality are readily obtained using this method. Precise control over NC formation and etching allows for access to materials with unusual chemical and physical properties. These shell-free nanomaterials are ideal for applications requiring efficient transfer of charges, such as LEDs or solar cells. Future work will optimize these methods, as well as identify and tailor other new reaction pathways.

Inorganic-Capped luminescent InP nanocrystals

253rd National Meeting (2017)

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