InP Quantum Dots

Indium phosphide (InP) quantum dots represent a breakthrough class of cadmium-free semiconductor nanocrystals that combine tunable photoluminescence with outstanding environmental compatibility. As a III-V direct bandgap material, bulk InP sits at 1.35 eV, yet when reduced to particles only a few nanometers across — smaller than its 10 to 14 nm exciton Bohr radius — strong quantum confinement takes over and the effective bandgap can be pushed all the way to roughly 3.0 eV. That single physical fact is what makes one synthetic platform capable of emitting across the entire visible spectrum and well into the near-infrared, simply by changing particle size.

At Eata Energy, our InP quantum dot portfolio is engineered for laboratories, pilot lines, and industrial R&D programs that need reliable, RoHS-aligned nanocrystals without the regulatory baggage of cadmium- or lead-containing systems. Whether your roadmap involves next-generation QLED backlights, color-pure micro-LED displays, high-efficiency photovoltaic stacks, or low-toxicity fluorescent probes, our InP/ZnS and InP/ZnSe/ZnS grades are built to slot into existing wet-chemistry workflows with minimal re-optimization.

Figure 1 — Colloidal InP quantum dot dispersions showing size-tunable photoluminescence from blue to red across the visible spectrum under UV excitation.

Why Engineers and Researchers Choose InP Quantum Dots

InP has matured into the most credible non-toxic alternative to the cadmium chalcogenide family. The reasons come down to a handful of physical and chemical advantages that show up consistently across peer-reviewed studies and industrial qualification reports:

• Cadmium- and lead-free composition. Fully aligned with RoHS and REACH frameworks, making the material viable for environments and end-products where heavy-metal restrictions apply.
• Wide, continuous color tunability. Particle diameters from roughly 2 nm to 12 nm shift emission from ~480 nm blue through ~750 nm near-infrared — no dopant chemistry required.
• Large exciton Bohr radius (~10–14 nm). More than triple that of CdSe, so confinement kicks in at bigger particle sizes and the optical response to size variation is highly sensitive.
• High photoluminescence quantum yield. Modern core/shell designs routinely deliver 50–85% QY in organic media, with selected InP/ZnSe/ZnS batches exceeding 90%.
• Narrow emission linewidths. Typical FWHM of 35–45 nm in the green-red range supports color-pure displays and high-signal-to-noise bioimaging.
• Robust surface chemistry. Standard oleylamine, TOP, and carboxyl- or thiol-terminated ligands allow straightforward phase transfer to water-soluble systems.

Core-Shell Architecture: Engineering the Bandgap

Bare InP cores suffer from abundant surface trap states that quench photoluminescence, leaving QYs below 1% in most cases. Wrapping the core in a wider-bandgap inorganic shell — typically ZnS or a ZnSe/ZnS gradient — neutralizes those traps, suppresses non-radiative Auger recombination, and pushes the optical performance into the range needed for real devices.

Shell Architectures Available

Figure 2 — Schematic cut-away view of an InP/ZnS core-shell quantum dot, showing the InP emitting core (orange) encapsulated by the ZnS passivating shell (blue).

Where InP Quantum Dots Make a Difference

The same nanocrystal platform serves strikingly different industries, which is part of what makes InP such a strategically interesting material. Below are the principal application areas where Eata Energy InP QDs are currently being qualified or deployed.

1. Displays and Solid-State Lighting

QLED televisions, monitors, tablets, and automotive displays rely on quantum dot color converters that down-shift blue LED emission into pure green and red. InP/ZnSe/ZnS grades give display manufacturers a RoHS-compliant path to wide color gamut (often > 110% NTSC) without the supply-chain risk that comes with restricted heavy metals.

2. Photovoltaics and Solar Energy Conversion

Bulk InP has a near-ideal bandgap for sunlight harvesting, and when tuned into the 1.0–1.6 eV range through quantum confinement, InP QDs become excellent light absorbers for QD-sensitized solar cells, perovskite/InP tandem stacks, and CIGS buffer layers. Reported devices have already demonstrated power conversion efficiencies above 10% in the QDSC configuration.

3. Biomedical Imaging and Biosensing

For fluorescence microscopy, flow cytometry, lateral-flow diagnostics, and in-vivo near-infrared imaging, the low intrinsic toxicity of indium (compared with cadmium) is a decisive advantage. Water-phase InP/ZnS QDs functionalized with carboxyl or streptavidin groups are routinely used for cell labeling and immunoassays.

4. LEDs, Lasers, and Photodetectors

Electroluminescent InP QD-LEDs have reached external quantum efficiencies above 20% in academic settings, and the same material is being evaluated for solution-processable photodetectors, optical interconnects, and single-photon sources in the red/near-infrared band.

5. Photocatalysis and Hydrogen Production

InP QDs show large extinction coefficients and a Bohr radius that drives efficient charge separation. Doped and surface-modified variants are actively being researched for photocatalytic hydrogen evolution and CO₂ reduction.

Figure 3 — Conceptual rendering of quantum-dot RGB subpixels used in next-generation QLED display panels, where each pixel color is generated by an InP-based nanocrystal emitter.

Standard Product Specifications

Eata Energy supplies InP quantum dots as concentrated colloidal dispersions. The table below summarizes the specifications most commonly requested by our research and industrial customers; wavelengths outside this range — including the full NIR window out to 750 nm — are available on request.

General Physical & Chemical Properties

Figure 4 — Illustration of quantum-dot-enhanced photovoltaic architectures, where InP nanocrystals extend spectral absorption into the near-infrared for higher conversion efficiency.

InP vs. Traditional Quantum Dot Chemistries

How does InP stack up against the well-known II-VI alternatives? The table below highlights the practical trade-offs that procurement, safety, and R&D teams typically weigh when qualifying a new nanomaterial platform.

Figure 5 — High-resolution view of InP nanocrystal ensembles, illustrating the uniform size distribution and high crystallinity achieved through controlled colloidal synthesis.

Custom Synthesis and OEM Collaboration

If the standard catalog does not fit your process, we can tailor the material to your specifications. Our team routinely works with customers on wavelength-specific batches, custom ligand chemistries, water-phase transfers, higher concentration dispersions, and dry-powder formulations. We also support multi-gram and pilot-scale production runs under confidentiality agreements, allowing you to bridge smoothly from laboratory proof-of-concept to industrial evaluation.

Tell us your target emission wavelength, solvent system, surface functionality, and required quantity — we will prepare a feasibility statement and quotation. Long-term supply agreements with reserved batch capacity can be arranged for projects moving into commercial production.

For Research or Industrial Raw Materials, Not For Personal Medical Use!