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Synthesis of Cd-free InP/ZnS Quantum Dots Suitable for Biomedical Applications
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Isotropic ZnSe Shell Growth for Uniform-Shaped Green InP Quantum Dots With Tunable Size and Absorption.

Donghyeok Shin1, Yuri Kim1, Beomgyu Kim1

  • 1Department of Materials Science and Engineering, Hongik University, Seoul, South Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|February 5, 2026
PubMed
Summary
This summary is machine-generated.

We developed a halide-mediated method for growing thick ZnSe shells on Indium Phosphide (InP) quantum dots, creating stable, efficient green emitters for displays. This strategy overcomes strain issues, enhancing optical properties and enabling color conversion applications.

Keywords:
InP quantum dotscolor conversionisotropic ZnSe shell growthmolar absorption coefficientuniform shape

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Indium phosphide (InP) quantum dots (QDs) are promising heavy-metal-free emitters for advanced displays.
  • Challenges exist in growing thick, uniform ZnSe shells due to strain and surface energy issues.

Purpose of the Study:

  • To develop a novel growth strategy for thick ZnSe shells on InP QDs.
  • To achieve uniform, near-spherical InP/ZnSe/ZnS QDs with tunable shell thickness and size.
  • To investigate the impact of shell thickness on photoluminescence quantum yield (PL QY) and optical absorption.

Main Methods:

  • A halide-mediated, stepwise ZnSe growth strategy was employed.
  • Tuning of shell thicknesses from 1.75 to 5.5 nm and final QD sizes up to 14 nm.
  • Assessment of PL QY and optical absorption properties as a function of shell thickness and QD size.

Main Results:

  • Uniform, near-spherical InP/ZnSe/ZnS QDs were successfully synthesized.
  • Near-unity PL QYs were maintained up to a critical ZnSe thickness of ~3.5 nm.
  • ZnSe shell significantly enhanced optical absorption, scaling with shell volume.
  • A size-dependent balance between absorption and light conversion efficiency was observed.

Conclusions:

  • The halide-mediated growth strategy enables the production of high-quality InP/ZnSe/ZnS QDs for display applications.
  • Strain accumulation at the InP/ZnSe interface limits PL QY beyond a critical shell thickness.
  • The ZnSe shell's contribution to optical absorption is significant and predictable.
  • These QDs show potential as efficient blue-to-green color converters with tunable properties.