4 years ago

Versatile Tri(pyrazolyl)phosphanes as Phosphorus Precursors for the Synthesis of Highly Emitting InP/ZnS Quantum Dots

Versatile Tri(pyrazolyl)phosphanes as Phosphorus Precursors for the Synthesis of Highly Emitting InP/ZnS Quantum Dots
Nikolai Gaponik, René Panzer, Danny Haubold, René Hübner, Chris Guhrenz, Jan J. Weigand, Alexander Eychmüller
Tri(pyrazolyl)phosphanes (5R1,R2) are utilized as an alternative, cheap and low-toxic phosphorus source for the convenient synthesis of InP/ZnS quantum dots (QDs). From these precursors, remarkably long-term stable stock solutions (>6 months) of P(OLA)3 (OLAH=oleylamine) are generated from which the respective pyrazoles are conveniently recovered. P(OLA)3 acts simultaneously as phosphorus source and reducing agent in the synthesis of highly emitting InP/ZnS core/shell QDs. These QDs are characterized by a spectral range between 530–620 nm and photoluminescence quantum yields (PL QYs) between 51–62 %. A proof-of-concept white light-emitting diode (LED) applying the InP/ZnS QDs as a color-conversion layer was built to demonstrate their applicability and processibility. Taking stock: Tri(pyrazolyl)phosphanes are utilized as a less-toxic P1 source for the synthesis of long-term stable stock solutions of P(OLA)3 (OLAH=oleylamine). The stock solutions are used for the preparation of InP/ZnS quantum dots emitting in the spectral range between 530–620 nm with photoluminescence quantum yields between 51–62 %. The liberated pyrazoles can easily be recovered and reused.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201705650

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