Full Color Al-Doped InP Quantum Dots with High Brightness via Gram-Scale One-Pot Synthesis for White Light-Emitting...

Area of Science:

• Materials Science
• Nanotechnology
• Quantum Dot Synthesis

Background:

• High-performance, eco-friendly quantum dots (QDs) are crucial for advancing display and lighting technologies.
• Indium phosphide (InP)-based QDs offer promising optoelectronic properties but require further optimization for commercial applications.

Purpose of the Study:

• To develop a highly efficient and cost-effective synthesis method for Al-doped InP/ZnS quantum dots.
• To investigate the impact of aluminum (Al) doping on the optical and stability properties of InP/ZnS quantum dots.
• To evaluate the performance of Al-doped InP/ZnS QDs in white light-emitting diode (LED) applications.

Main Methods:

• A one-pot synthesis method was employed using aluminum isopropoxide (AIP) as the Al source.
• A series of Al-doped InP/(Al)ZnS QDs with tunable emission wavelengths (480–627 nm) were synthesized.
• Characterization included photoluminescence quantum yield (PLQY) measurements, full-width at half-maximum (fwhm) analysis, photostability testing, and structural analysis (e.g., shell thickness, Al presence).

Main Results:

• Al-doped InP/ZnS QDs exhibited high photoluminescence quantum yields (PLQY) up to 96% and narrow fwhm.
• Synthesis was rapid, with reaction times under 4 hours for all QD colors.
• Al-doping improved PLQY, narrowed fwhm, and enhanced photostability in red QDs, attributed to increased shell thickness and reduced lattice strain.
• Synthesized QDs demonstrated excellent performance in an on-chip white LED, achieving high power efficiency (17.8 lm W⁻¹) and a wide color gamut (97.4% NTSC).

Conclusions:

• The one-pot synthesis of Al-doped InP/ZnS QDs is an efficient and scalable method.
• Al-doping significantly enhances the optical properties and stability of InP/ZnS QDs.
• These Al-doped QDs show great promise for next-generation display and solid-state lighting applications.