Synthesis and Spectroscopy of Emissive, Surface-Modified, Copper-Doped Indium Phosphide Nanocrystals

Abstract

Aminophosphine precursors were used to synthesize copper-doped indium phosphide nanocrystals (InP NCs) via direct doping in a slow-injection bottom-up method and postsynthetic cation exchange. By both methods, the amount of copper incorporated into the NCs could be tuned simply by varying the molar ratio during synthesis. Common postsynthetic surface modifications such as Lewis acid treatment and zinc chalcogenide shelling were performed on these samples, resulting in an enhancement of the copper-based emission from 10% to 40%. For samples with thick shells, the copper-based photoluminescence quantum yield reached over 60%, a record value for doped InP NCs. Time-resolved photoluminescence spectroscopy showed increasing carrier lifetimes after surface treatments concurrent with the disappearance of a 2 ns decay process previously attributed to surface trapping in native InP NCs, showing the broad applicability and consistent impacts of the surface treatments. In this way, we have successfully developed a route to obtain high-quality near-infrared emitters utilizing less toxic alternatives to the popular lead-and cadmium-containing materials.

Activatable fluorescence sensors forin vivobio-detection in the second near-infrared window

“…Inorganic nanoparticles are rarely applied individually as responsive sensors due to their relatively stable structures and spectral properties. [57][58][59][60] Generally, to obtain the responsive signal change, the uorescence or luminescence energy transfer pathway should be activated, interrupted or inuenced (Fig. 4a).…”

Advances and Challenges in Heavy-Metal-Free InP Quantum Dot Light-Emitting Diodes

“…Tris(trimethylsilyl)phosphine ((SiMe3)3P), as the mainstream phosphorus precursor for the synthesis of InP QDs, is not only expensive but also highly active; thus, it can spontaneously ignite in air and explode at high temperatures [ 35 , 52 ]. Recently, a type of aminophosphorus, tris(dimethylamino)phosphine ((DMA)3P), was used to replace (SiMe3)3P as a phosphorus precursor [ 47 , 53 , 54 ]. By using aminophosphorus precursors, controlled-reaction conditions with suitable reactivity and good safety can be obtained in the wet synthesis process.…”

On Topological Indices for Complex Indium Phosphate Network and Their Applications

“…But, as its surface is relatively unstable because of corrosion in acidic media, its surface is modified via MoS 2 nanoparticles. MoS 2 NPs act as a protective layer and enhance catalysis of GaInP because of their anticorrosion properties and are highly recommended as water splitting photocathodes [28]. Indium phosphide is being used in photoelectrochemistry because of having a thin bandgap (1.35 eV) that can absorb solar radiations by decreasing the reflection of photons, resulting in the solar splitting of water.…”